Rias Gremory/Plots

The Red Dragon Emperor's Awakening
She revived Issei as her servant after the latter was killed by the Fallen Angel Raynare (then as Yuuma Amano), Issei had unintentionally summoned her when the color of his blood reminded him of her. The next school day, Rias walked through the schoolyard as everyone around her admired her beauty, she noticed Issei's gaze amongst them and smiled at him. She later saves Issei while he was being attacked by another Fallen Angel, Dohnaseek. Badly injured and in need of medical assistance, she brought him back to his house and spends the night healing his injuries. The next day after school, she introduces Issei to her other servants as well as welcoming him as the newest member of her group. She also revealed that and that he was in possession of a Sacred Gear had become a Devil the same as them, as well as the truth about Yuuma being a Fallen Angel. She saved him a second time from Freed Sellzen along with the other members of the Occult Research Club. When Issei goes to the abandoned church to rescue Asia Argento, Rias helps Issei indirectly by killing three of Raynare's Fallen Angel allies before terminating Raynare herself. She then revived Asia as her Bishop to Issei's delight.

At the beginning of Volume 2 after the usual daily training with Issei, Rias informs a shocked Issei that Asia will be staying with him, successfully persuading Issei's Parents that Asia's stay is for bride training, making them happy. Rias later goes to Issei's room during night time, attempting to have Issei take her virginity in hopes of breaking her engagement. The attempt, however, was stopped with the appearance of Grayfia Lucifuge, Sirzechs' Queen, who scolds Rias for attempting to break off the engagement set by her brother and father. When Rias' fiancé, Riser Phenex, appears in the Occult Research Club, Rias, who was still unsatisfied with the engagement, agreed to have a Rating Game with Riser under the condition that should Rias win, the engagement will become invalid, and should Riser win, Rias would be forced to marry Riser immediately.

In preparation for her Rating Game with Riser, Rias sets up a training camp in the mountains for Issei and Asia who both lack fighting experience. During their training in the mountains, Rias starts to develop strong feelings for Issei. On the day of the Rating Game, Rias faces Riser in a replica version of Kuoh Academy set up in a dimensional space. While the battle initially went well for Rias' team, they ultimately lost due to the lack of people on her team, surrendering after seeing Issei being beaten to near-death, yet still standing, trying to fight for her. She was later seen at her engagement party in the Underworld, which was interrupted by Issei who came to challenge Riser one more time with Rias' engagement on the line, with Issei successfully winning this time. After Issei helps to break off the engagement between herself and Riser, Rias falls in love with Issei and kisses him for the first time. She moves into Issei's house after the incident with Riser.

Birth of the Breast Dragon Emperor
In Volume 3, Rias introduces her new servants, Issei and Asia, to the Student Council members led by Sona Sitri, a pure-blooded High-Class Devil from the Sitri Clan who is her childhood friend and rival. Issei noticed a change in Yuuto after looking at Issei's childhood photos, one of which was taken with his childhood friend, Irina Shidou, with a Holy Sword visible in the background. Rias then explains Yuuto's past to Issei and was greatly disappointed when Yuuto left her to seek his revenge after seeing both Xenovia and Irina. She and Sona eventually found out the alliance Issei, Koneko and Saji made with the church duo to destroy the Excaliburs, punishing the two of them for their actions. When Kokabiel, one of the leaders of the Fallen Angels, announced his war declaration against both the Gremory and Sitri clans who are attending the Kuoh Academy, Rias gathers all her servants (except for Yuuto who is still missing) in an attempt to fight back while having the Sitri Group as support. During the fight, Kokabiel summoned out many Cerberus to battle the Gremory Team but was defeated by the combined effort of the Gremory Team and Xenovia who arrived at the battlefield. After Yuuto attained his Balance Breaker and broke the Excalibur with Xenovia's help, the Gremory Team was then forced to battle Kokabiel himself but were easily overwhelmed by the Fallen Angel Leader and was in despair until the sudden interference of Vali Lucifer who came to retrieve Kokabiel under Azazel's order. Following the battle, Rias reincarnated Xenovia as her second knight after the latter asked her after she found out that the God from the Bible is dead.

In Volume 4, after Issei reports on his meeting with Azazel much to Rias' anger on Azazel's action, they are surprised at the sudden appearance of Rias' brother, Sirzechs Lucifer, who came for Rias' class observation, telling Rias that Azazel won't do anything drastic like Kokabiel. Rias later unseals her other Bishop, Gasper Vladi, a half-Vampire who she revived as a Devil using a Mutation Piece, after receiving orders from Sirzechs. During the peace talks between the Three Factions, Rias was asked to report the events that happened during Kokabiel's attack and assisted when the Khaos Brigade attacked using castling to rescue Gasper who was used by the terrorists. Near the end of Volume 4, Rias is seen troubled when Azazel introduces himself as the adviser for the Occult Research Club, getting angry at Azazel when he suggested taking Issei on a virgin graduation tour, telling Azazel that Issei's virginity is under her watch. She also decided to renovate Issei's house after Akeno, Koneko, and Xenovia moved into the Hyoudou Residence.

In Volume 5, Rias returns to the Underworld for the Young Devils Gathering in which they will fight in Rating Games. Before the opening ceremony for the Young Devils Gathering, Rias introduces her cousin, Sairaorg Bael, to Issei, telling him that Sairaorg is the strongest young Devil. On the opening ceremony of the Young Devils Gathering, all the six chosen young Devils are asked to step up and speak out their dreams. The ceremony ended with Sirzechs announcing the first match for the Young Devils Gathering that is between Rias and Sona. During the party set up by Sirzechs Lucifer for the young Devils, Issei and Rias notices Koneko rushing out of the party hall and follow pursuit, seeing Koneko's older sister, Kuroka, who attempted to bring Koneko back with her, with Rias objecting, claiming that Koneko is her Rook and she won't allow anyone, even Kuroka, her biological sister, to take her away. Feeling troublesome, Kuroka then uses a special mist that affects both Rias and Koneko, limiting their mobility. Despite so, Rias was still useful in the fight, as her breasts were used by Issei to attain his Balance Breaker. She later faces her childhood friend and rival, Sona, for her first match in the Young Devils Gathering and won due to Issei and Yuuto's aid but was unhappy with the victory because she lost four of her servants and was unable to display the full potential of her group. Near the end of Volume 5 while on their way back to the human world, the team was surprised to see Diodora Astaroth who introduces himself.

In Volume 6, she was scheduled to face Diodora for her second match in the Young Devils Gathering. before so, Diodora even came to their club room offering to trade one of his servents for Asia but rejecting his offer to exchange. During the day of the Rating Game, Rias and Diodora's supposed Rating Game did not occur due to the Khaos Brigade's interference and the revelation of Diodora's alliance with them. After Diodora kidnaps Asia, Rias and her peerage go to rescue her while fighting through Diodora's peerage, both Rias and Akeno defeated his Queen and both Bishops. They arrived to his destination where Rias allowed Issei fight Diodora alone and free Asia, even so Asia had suddenly vanished as Shalba Beelzebub had sent her to the Dimensional Gap. During Asia's supposed "death", Issei's negative feelings made him activate his Juggernaut Drive and go berserk in attempting to kill Shalba. Vali and his team arrived and happened to have rescued Asia, Vali suggested that they needed to stimulate Issei's heart to calm him down. That was when Irina came with a recording of the new song written by Azazel and her brother, allowing Issei to regain part of his sanity before having Rias use her breasts to cancel the Juggernaut Drive. Rias and her friends where later seen during the sports festival cheering for Issei and Asia on their three-legged race. After the race, she told Asia to take Issei behind the gym to heal him as well as whisper in her ear to give her motivation to confess to him.

The Heroic Oppai Dragon
In Volume 7, Rias and her club members were in a big hall located at the basement of the Hyoudou residence as Azazel showed them a tokusatsu of the Oppai Dragon show based off of Issei that's currently popular with kids, staring her character as the heroine known as the Switch Princess. Rias express her embarrassment and displeasure of being publicly called Switch Princess in the Underworld since her breasts were what caused Issei's transformations. She and the other girls then glared at Issei whom Akeno was hugging from behind while reminding him of the date he promised. At school, her club were discussing what activities to do for the school festival until they all got a call to deal with the Hero Faction of the Khaos Brigade in town, after fending off several members with Sacred Gear. That night, Rias and Asia overheard Issei's talk with Koneko involving making babies and calling her a bad influence, she and Asia then spend the night in his bed interrogating him. The next day, Rias and several of her servants went to spy on Issei and Akeno's date. Akeno took Issei manage to escape Rias and the others, much to Rias' displeasure despite the date ending abruptly due to the two encountered the Norse Chief God Odin, Rossweisse, and Baraqiel, Akeno's father. The Occult Research Club are then asked to served as Odin's bodyguard until his meeting with the Japanese gods to form an alliance. Several days later, they are then attacked by Norse's Evil God Loki who came to kill Odin and create Ragnarok, Loki was able to overwhelm them with his son, Fenrir, but decided to retreat after seeing the Vali Team, claiming that it is enough to see the Two Heavenly Dragons together. Both two teams eventually decided to work together to defeat Loki and Fenrir, asking the advice of one of the Dragon King's, Midgardsormr, on how to defeat Loki and Fenrir, although Rias expressed her hatred towards Bikou for being the one who coined her the name Switch Princess. The night before the battle, Rias comforted Issei who was feeling nervous about the upcoming battle, the two then shared their third kiss. Loki was eventually defeated in conclusion of the battle. Later in the Club room, Rias recruited Rossweisse into her Peerage as her second Rook, who was abandoned by Odin. Rias, Asia, Koneko and Xenovia were then angered at Issei when Akeno had kissed and confessed to him in front of them.

In the Extra Life of Volume 8, Rias and Issei went to the Underworld and underwent a ceremony at the Ruins of Connection to test their love for each other. Issei, however, does not realize the purpose of the ceremony. Throughout the ceremony, Rias and Issei faced four trials set up by the Satan Rangers. In the first trial, Issei and Rias had to dance; in the second trial, Rias and Issei were tested on table manners; and in the third trial, Issei and Rias was tested on the history of the Gremory Clan and general knowledge in the Underworld, all of which they successfully passed before moving to the final trial. In the final trial, Issei was forced to fight Sirzechs/Satan Red and was completely overwhelmed by the latter until Grayfia's advice on using Rias' breasts as a power-up allowed Issei to use one final Dragon Shot but still lost after Sirzechs negated the attack and retreated after Issei loses consciousness. Despite so, they passed the trial and Issei became officially as a suitable candidate husband.

Volume 9, Rias had just gotten out of the bath to find that Akeno, Koneko and Asia were clinging to Issei in his room, she was furious at her servants for disobeying her and claiming that he was theirs, she yelled in objection saying the he was hers. Rias and her club members were audiences for Issei's mock battle with Sairaorg. Just as everyone was about to leave for their trip to Kyoto, Rias gave them passes for Devil to enter holy places such as shrines as well as a badge to Asia to also Issei to use Promotion. After adjusted Issei's collar, Rias leaned in and expressed that she will also be lonely without him and kissed his lips before seeing him off.

Rias was briefly mentioned by Azazel as being busy and cannot help Issei and the others in Kyoto with their battle against the Hero Faction as she is in the Gremory territory and fending off the assaults incited by the Old Maou supporters, along with her mother and Grayfia. She was then summoned to Kyoto and got her nipples poked by Issei for him to power up and use Illegal Move Triaina. After the trip and everyone's return home, Rias, Akeno and Koneko were angry at them for not informing them of the situation with the Hero Faction.

At the beginning of Volume 10 of the light novels, Rias and the rest portrayed their characters in for the Oppai Dragon under her brothers request. Soon after, her mother, Venelana, encourages her to push her relationship further with Issei and take the lead in his harem, in which Rias would attempt to seduce Issei. She and Issei payed a visit to Sairaorg and his mother who had been ill for along time. The Gremory Group and Sairaorg's team had a press conference where they face questions from reporters, some in particular asked Issei if he will be pressing Rias' nipples during their upcoming match which greatly embarrassed them both.

Following her mother's advice, Rias indeed tried to seduce Issei by trying to have sex with him in the sauna room of the Hyoudou Residence, but she got upset when Issei could not call her by her name and she left in tears. At the club room, after the call with Ravel's mother where she requested Issei to look after her daughter, Rias asked Issei about how he felt about about all the other girls, yet still only refereed to her as "President" instead of her name which greatly upset her to tears as she ran out with Asia chasing after to console her.

She later faced her cousin, Sairaorg Bael, in a Rating Game which Rias' team won after Issei beats Sairaorg, making Rias the winner of the Young Devils Tournament. Back home, the Occult Research Club decorated their club room as a haunted house for the school festival. At the end of the same volume, Issei finally confesses and calls her Rias for the first time instead of President. She sheds tears of joy and tells him that she feels the same way and the two officially become a couple. Just as they were about to kiss, their moment was interrupted however as everyone else was spying on them, causing her to be angry at them and blamed Issei for picking the wrong moment.

In Volume 11, she accompanied Issei, Akeno, and Yuuto during their Middle-Class promotion test with Issei asking her out on a date should he pass the test. While Issei and the other two are resting the after the test, they are ambushed by Cao Cao and Georg who came to steal Ophis' powers. The battle ended with the Gremory and Vali Teams losing to Cao Cao and Ophis' powers stolen. Both teams were then attacked by a legion of Grim Reapers and Siegfried. They eventually overcame the situation by having Issei use Rias' breasts to replenish Issei's magic and successfully force their enemy to retreat. At the end of Volume 11, while waiting for Issei to return from the crumbling dimension, Rias like the rest of the Occult Research Club was surprised that only Issei's Evil Pieces returned, and was shocked to find out that Issei died.

In Volume 12, Rias, who was still in shock at Issei's "death", locked herself in her room and was not responding to anyone until Sairaorg came and talked some sense into her. She and her peerage later goes to the human world to meet with the creator of the Evil Pieces, Ajuka Beelzebub, to have him check on Issei's Evil Pieces and are surprised to see the Khaos Brigade's Old Satan Faction and Hero Faction coming to see Ajuka, intending to form an alliance with the latter which was rejected as Ajuka finishes off the Old Satan Faction members, leaving Siegfried to the Gremory Team. Like the rest of the girls, however, Rias was unable to display her usual strength until Issei's Evil Pieces glow and convey his feelings to the team, allowing them to regain their determination to fight. After Ajuka confirms that Issei's soul is still alive she and the rest of the Occult Research Club were extremely happy, looking at the news to confirm the current status of the Underworld until hearing that the Sitri Group is engaging the Khaos Brigade in the town area as they head out to battle the Khaos Brigade. After Issei returns, Rias inserts back Issei's Pawn Evil Pieces into his body kissing him. At the end of Volume 12, Rias congratulates Issei for passing his Middle-Class promotion test, asking him out on a date as promised before the test.

The Legend of Oppai Dragon and his Lively Companions
In Volume 14, Rias and her peerage meet the director of the Magician Council, Mephisto Pheles, regarding their pact with the Magicians. Rias also mastered a new finishing attack during her training with Akeno. After the negotiation with the Carmilla Faction from the Vampire side, Rias was angered by their means of obtaining Gasper by using the peace negotiations of the Three Factions to force them to hand over Gasper or risk allowing the Devils to lose trust on their intentions of achieving peace. She later decides to leave for Romania with Kiba and Azazel in order to learn more about Gasper's ability.

In Volume 15, Rias accompanied by Kiba were staying at the House of Vladi until a Vampire from the House of Vladi asked them to meet the current leader of the Tepes Faction, Valerie Tepes, much to the surprise of the two.

In Volume 16 Rias, along with Yuuto, were confined in the Tepes castle in due to the coup d'etat of the anti-government group in the Tepes Faction that are helped by the Khaos Brigade in the shadows. She later reunited with the Occult Research Club members after Azazel told the group to come to Romania as they met the new "King" of Tepes Clan, Valerie Tepes and the new mayor of the town, Marius Tepes. Rias and the group were angered by Marius' action where he doesn't even hide from them the fact that he is indeed controlling Valerie's emotions and actions. After the meeting, Rias and the group were shocked at the appearance of Rizevim Livan Lucifer and Lilith. She then participated in the attempt to stop the extraction of the Longinus, Sephiroth Graal, from Valerie and save her; fighting the enhanced Vampires and Grendel along the way and in doing so, used her new move, Extinguished Star, to injure Grendel. Rias later teamed up with Akeno in defeating the mass-produced Evil Dragons that were rampaging in the Carmilla's castle town. After returning from Romania, Rias participated in the meeting for the formation of D×D. After the meeting, Rias proclaimed that they need to stop Rizevim's violent acts and they need to get stronger in order to do so.

In Volume 17, Rias was asked by Rossweisse for permission to have Issei act as her boyfriend due to a lie she told her grandmother, Göndul. Rias and the Occult Research Club went to the Underworld and visit the newly built Auros Academy, which was eventually attacked by Qlippoth, Rias, Sona and their respective Peerage team up to defend the school. Later Rias and Issei fought against Euclid who had captured Rossweisse due to resembling his sister Grayfia, they managed to save her and defeat him and have him arrested. In the aftermath, Rias and Issei help clear the rubble when he asks to talk to her more casually during their private times which gladly accepts, their moment is interrupted by Sona who jokingly offered to build a memorial for them here.

In Volume 18, Rias and Issei were watching the Oppai Dragon show, after that she and the rest of the club members went to Heaven to discuss the Christmas project that the alliance is working on with Michael. After the meeting, Michael informed them about the deaths of the Church officials and the presence of Evil Dragons found at the attacks. She is later seen along with the other girls observing the Interdimensional Room that Touji Shidou brought for Irina to be able to have sex with Issei without falling and commented on how revolutionary the room was. After Touji Shidou was attacked by Masaomi Yaegaki, the one responsible for the deaths of the Church officials, Rias and the Occult Research Club meet up with Zekram Bael, who revealed to them that he ordered with the permission of the Church the death of the exorcist Masaomi and the High-Class Devil Cleria Belial for being in a romantic relationship, in order to maintain the status quo that both sides did not want to disturb. Rias and the other club members helped defend Heaven, with the assistance of Cao Cao much to their surprise, from Qlippoth's sudden assault, he then proceeded to help Rias fight against Ladon where they managed to trap him inside a hole that was made by Cao Cao, allowing Rias to use her Extinguished Star of destruction, thus allowing her to defeat Ladon, Koneko then proceeded to seal Ladon's Soul inside one of the Jewels that she got off of Issei's armor in order to prevent his body from being restored by the Holy Grail.

In Volume 19, Rias went to Kyoto along with the other club members for New Year’s Day, where she and Issei meets up with Kunou and her mother Yasaka who greet their arrival. Rias tells Issei about a previous discussion with Yakasa about Kunou attending middle school at Kuoh Academy in the coming year. The two then head to the top of the shrine meet up with their friends who’re giving their prayers while noticing Xenovia suddenly kissing Issei. A few days later, at night in the Hyoudou Residence underground pool, Rias and Issei show to the members of their club, Vali’s Team, Dulio, Sister Griselda, Tobio and others their new technique too. She then requests Issei to rub sun lotion onto her back, which catches the attention of most of the other girls who also want to take turns in him rubbing lotion on them with Ravel sorting a schedule.

The next day, while the gang is going out, they are visited by Vasco Strada, one of the people leading a rebelling against the Church, he Rias a gives a challenge announcing a battle between them and the rebels in three days. Later on, Tannin paid a visit to the Hyoudou Residence, asking for their assistance in looking after an egg of a rare species of Spectral Dragon and is surprised to see that Crom Cruach is the one delivering the egg, it’s revealed that he is currently under Tannins care.

On the day of the battle against the Church rebels, they gain assistance from the Sitri group and Brave Saints. They split into two teams to defeat the rebel leaders, Vasco Strada and Ewald Cristaldi, with Rias leading the team to battle against Vasco. The battle against Vasco proves to be difficult as none of them are able to hit him even when Yuuto, Irina, and Arthur joined in, that is until Xenovia was able to beat him with both Durandal and Excalibur. They were about to arrest Vasco until he attacked by Walburga's sudden ambushed, she planned on taking everyone out with her army of Evil Dragons, however, the Dragons are soon immobilized by Rosswiese's barrier and her escape was cut off by Tobio. Rias and her team go up against Walburga who activated her Balance Breaker containing half the soul of Yamata no Orochi, everyone gave it their all against it until it was destroyed by Xenovia's new "Cross Crisis" technique and Issei finishes her off with his Crimson Blaster, resulting in her defeat and arrest. Rias and the others later heard the tragic news of Ravel having gone missing along with Raiser and Diehauser during their Rating Game.

In Volume 20, everyone is depressed over the disappearance of Ravel, including Raiser and Diehauser, they believe that Qlippoth is responsible with suspicion of the Champion also being involved. After bathing with Asia, Rias and her noticed Issei's Mother looking at a photo album, she tells them stories about Issei's childhood like the last time Issei went fishing with his Father. she then says while her son is perverted and stupid, he is still an honest person and entrusts him onto both of them. When they heard Ravel was now under Ajuka's care, The D×D members arrive at different dimension resembling a nighttime beach with two moons where they spot Ajuka next to Ravel who is in a bed barely conscious and assures them that Raiser was sent home safely by Slash Dog’s Team. Ajuka then explains to them about his secret creation from the general public known as the King Pieces and how some top-ranked Rating Game contestants have been using them, which was proposed by the higher-ups in the Underworld, a revelation that shocked everyone present. He then explains that while also having one in possession, Diehauser has only ever used his own strength, but reveals the champions involvement in stealing Agreas in order to pursue the truth of everything, another shocking truth revealed to everyone. Soon Ajuka receives a startling call and tells them to return home as Ophis is being attacked by an Evil Dragon.

Back at the Hyoudou Residence, Rias' group arrives to see Ophis unconscious on her bed and brutally injured from protecting the Dragon egg from Niðhöggr, who also kidnapped Issei's parents. Just when Kuroka and Le Fay arrive from the rest of Vali’s Team, they bring them info about the location of Agreas, the hideout for Qlippoth’s base. Later on, D×D prepares to strike back as they teleport to Agreas, with the Gremory team being the main force. Rias' group make their way through Agreas when they come across Niðhöggr, everyone began their attack on him with full force with Issei and Rias using their new technique that equips Rias with her own variation of the Scale Mail armor; Crimson Extinct Dragonar. However, all their efforts are useless as Niðhöggr recovers from their attacks using several vials of Phoenix Tears, which is until Crom Crauch appears and brutally beats Niðhöggr. Rias tells Issei to move forward along with Asia to find his parents.

In Volume 21, a week after Trihexa was unleashed upon the world, Rias along with the others and Issei's parents await his recovery in a hospital in the Underworld. When Issei wakes up, they're surprised to learn that due to the aftereffects of using DxD mode, he's unable to see, talk or even think about breasts as it would cause him pain otherwise. Sometime later when Issei is able to move again, both Rias and Akeno warn him to not push himself too hard. Their group headed to an island on the coastal waters of Japan where they join up with an army of different races from various factions to battle Qlippoth's army of Evil Dragons, fake Scale Mails and one of the bodies of imperial beast led by Apophis who are on route to their location. With Issei's assistance, Rias activated her Crimson Extinct Dragonar armor and fought alongside everyone. At the end of the war, after Sirzechs, his peerage and some of the other mythology leaders sealed Trihexa along with themselves, Rias is seen next to Sona who are both expressing their sadness and disappointment at their older siblings for leaving them so suddenly.

In Volume 22, Rias catches Akeno attempts to have sex with Issei, who joins them not wanting to be left out. They were interrupted by the arrival of Ravel and the Church Trio, with Ravel giving the news to Rias about the Rating Game World Tournament. After this, Rias kisses Issei's cheek and leaves with Akeno to find out more about the tournament.

On their next weekend off, Rias along with everyone from the Occult Research Club, Vali's team and Issei's parents went on a fishing trip on an inhabited island owned by someone related to them to them. She and Akeno assisted Issei's mother carrying the food and setting up setting up the parasol on the beach. After Issei had officially been promoted into a High-Class Devil, Rias had traded Asia and Xenovia into his peerage.

On the day of graduation, Rias goes together with Issei and Akeno to Kuoh Academy, holding Issei's arm while they walk. In the ceremony, she shed tears after Yuuto, Koneko, and Gasper started to call her variations of "nee-san" which she happily tip toed at the sound of. Rias then requested for Rossweisse be also transferred, while she was initially baffled by this, Rias hugged and assured her that she believed that Rossweisse will be able to release all of her potential the most by serving under Issei while in turn he will need her strength and support, which she accepted as the two shed tears. She then gets proposed by Issei which she tearfully accepted and the two become officially engaged.

Red Dragon Emperor of the Blazing Truth × White Dragon Emperor of the Morning Star: The True Dragon(s) of the Kuoh Academy
Rias and her current peerage attended the opening ceremony of the Azazel Cup along with new temporary members such as Mr. Black as her Pawn, Sellzen as her Knight and Valerie her Bishop for the duration of the tournament. She and everyone and witness Issei's teams late yet grand entrance through Ryuuteimaru with Rias saying to Issei that she won't lose to him. After Issei's match against Baraqiel, Rias started to bicker with Akeno after Issei confessed to her on who will take Issei's virginity.

In Volume 23, Rias had already achieved continuous victories over her matches, her next Rating game match was with an Ultimate-Class Devil when she shows off to everyone the improvement of both old and new members of her team. She easily overpowered the Ultimate-Class Devil who was already wounded from Crom Cruach's earlier attack, with most of the opposing teams peerage being forced to retire, the Ultimate-Class Devil had no choice but to surrender, thus adding another win to Rias and her team.

Rias and her servants were in the spectator room for related personnel observing Issei's Rating Game with Dulio. Rudiger was also present and discussed with her the strategies he thought of to be used against Issei such as exploiting Xenovia to help Irina which cost her the goal and caused her to berate herself, as well as trapping Issei in a bubble showing a recording of Gabriel in a swimsuit. Just when things were seemingly down for Issei's team, Xenovia wore her Crimson Destruction Dragonar armor, upon witnessing it Rias gave a bitter smile and questioned Rudiger whom remained silent if he had predicted this outcome. Rias was also able to figure the identity of Issei's Queen Bina Lessthan was in fact Grayfia Lucifuge.

On a later date, Rias payed a visit to the farm in Italy where Vasco Strada was under house arrest, to offer him a place on her her team for the tournament. While Vasco was intending to decline like all the others, Rias attempted to persuaded him by reaching out to the warrior in him to fight again, she then sweetens the deal by temporary restoring the old man to his youth via non-demonic means so as to not appose Vasco's faith. Further Rias teleported a long, slim briefcase, within it were two sword, one of which was the new Durandal II sword for Vasco created by Heaven, Vasco picks it up and slowly come to accept her offer. Vasco warned Rias that he will cut down her future husband should they face each other, she simply replies that it's just something he will have to overcome, to which they saw it as part of Issei's groom training.

Rias then recalls back to when she confronted Grayfia after Issei's match, Grayfia revealed to her that she intends to make Issei a Satan, believe that this will eventually be the intention of the entire Underworld and plans to support him in this endeavor. Rias stated that she will win even against her, to which Grayfia is glad to hear from her sister-in-law.

Vasco then question the second sword, Rias replied that it was a crimson sword that Heaven had gifted her on her engagement as a blessing, but since neither her or Issei can master it, she instead plans to pass it on to her future children. Agreeing with the idea, Vasco then desires to bless her children should he live long enough, though Rias obviously notes that it be a lot of trouble to bless Devils. As the two were catting, Rias got a call from Akeno on her phone, she received shocking news that The Champion Diehauser Belial has been temporarily released for the tournament.

Rias appeared in Volume DX.4, participating in the talk show with Issei and Sairaorg and gave out her answer to the host when he asked her a question regarding the tournament. Rias watched as Sairaorg received criticism from the audience and accuses him using a king piece, she stopped Issei from standing up to the audience and reminded that protecting his peerage is his duty now. Rias watched the match between Sairaorg and Cao Cao in the vip room with the current and former members of the Occult Research Club and Student Council. Few days after Cao Cao’s victory against Sairaorg, Rias was watching Miracle☆Levia-tan with Issei, Akeno, Ravel, and Seekvaira and became shocked that Sona is performing as Levia-tan and she felt sorry for Sona as she takes the burden in Serafall’s absence. Rias was later reminded by Crom of their contact and came to get more bananas, so she had Akeno lead him to the basement of the Hyoudou Residence not before warning him about Ophis being there as well. She went shopping on her day off with Issei, Kunou, and Lint and she lets the two girls go to the game center to play games, while she and Issei go on their shopping date. When Kunou and Lint return from their gaming experience and showed their plushies they got from the crane game, Rias watches the two as they head to the clothing shop and she told Issei that she would like to have one daughter, which shocks Issei and later she confidently predicted their first child will be a boy. At the Armaros Colosseum, Rias and her team watches the match between Issei and Sona, with Issei and his team becoming the victor.

In Volume 24, the Gremory group visited the school swimming pool to relax, Rias all of Issei's fiances were arguing over who should he rub sun tan oil first. She removed her top declaring as the first to strip to go before the others, Xenovia took it further and attempted take Issei to the storage room to make babies, but Rias and Akeno were against it, Xenovia then challenged Rias to a swimming contest to see who gets Issei. Rias stopped swimming as she and everyone caught word that all their parents and guardians have met up at the Hyoudou Residence. Upon arriving home, Rias and everyone learned the reason for all of them gathering was to discuss plan for the wedding ceremonies for each of Issei's fiances, upon hearing this the girls made their requests, Rias' wanting to hold hers in Kyoto as she showed her parents a wedding brochure she had in hand. Vasco then appeared before them wanting to give his blessings at that time as a priest, everyone from Issei's team was surprised when Rias announced that Vasco will be participating in the tournament with her team. Everyone then sat in the living room listening to Issei's father telling stories about his grandfather.

Evening on the following day, Rias had just heard about the attack from the Grim Reapers while having also heard a similar situation from Sairaorg with some unidentified Devils causing riots, they then received a message from Tobio who had relevant info on the topic. Rias, Issei, Ravel and Rossweisse met with Tobio at the bar he worked the next day, there they also met with Lavinia whom Issei showed lustful intend, causing her and the other girls to scowl at him. Cao Cao then appeared before then with the info Tobio called everyone for, they learned that there's a faction of Grim Reapers led acting behind the scenes of the tournament, the unidentified Devils were somehow confirmed to be pure blooded and Grim Reapers led by Hades were spotted during their riots as well as were unrelated to the ones that attacked Koneko. Back home at the VIP room, Ravel suggested that they needed to know more about Koneko's past to find out why she became a target, with Sona and Tsubaki's assistance they recommended visiting the mirror Youkai who can communicate with those who have parted. As everyone used their connections to find it, Rias reminded Issei of the branch house of Naberius that took in Koneko and Kuroka, informing him that they were obsessed with a certain dark research which against the main family’s wishes continued to carry out dubious experiments.

Rias invited Issei's team for a training session to help her for the upcoming match against Vali's team, she stood beside Issei watch Gasper and Ouryuu's mock battle, noting two will make good rivals for each other. Suddenly they were attacked by Grim Reapers who came back to abduct Koneko, as they fought Issei questioned their movtives but only confirmed that they are following only Thanatos orders independent from Hades. However the Reapers had no luck obtaining their objective with the late arrival of Vasco and Crom Crauch and their leader defeated, they resorted to retreating. Back home they had Bennia call her father to find additional info on Thanatos. Rias, Issei, Akeno and Ravel transported to an old shrine that was situated deep in the mountains of the Tohoku region in Japan to meet with the mirror Youkai. While Sona introduced the current Ungaikyo, it stated that he cannot fulfill their request due to complications but was immediately persuaded when Magari also arrived who also wanted to know the details of Koneko's past. Although the Ungaikyo informed them that the soul of Koneko's father had been placed under seal, Magari had ever one prepare a tub that would allowed her to negotiate with Great King Enma but still proved to be difficult as the seal was was done by a magician using demonic energy, she added that they could get some leeway when they get the cooperation of a Satan and a magician’s association. As Rias, Akeno, Ravel, Sona and Shinra used their own respective channels to seek help, while Issei waited, Rias suggested that he could use the Ungaikyo to can call his late grandfather. Issei soon then introduced Rias to as one of his fiances, the old man admired hers and Akeno's chest while recalling Issei wanted to marry an "onee-san" with big breast when he was younger. Their communication was about to be cut off, he assured that should anything happen he will come over to help him and leaves his parting words to Issei to feel up as many breasts as he can.

With the cooperation of the other factions, the Ungaikyo was able to bypass the seal and summon the soul of Koneko and Kuroka's father but was having trouble remembering anything, although when Rias questioned him regarding Koneko and Kuroka he slowly began recall his memories of his past and Nekomata lover Fujimai. They learned that the scientist had been experimenting on artificially creating Super Devils for the branch house of Naberius as well as someone of Nebiros which greatly shocked everyone, Issei in particular was angry at the fact that he did not have mutual feelings for Fujimai or even aware that the girls she birth were his. Furthermore, they learned that one of Koneko's hair clip ornament that was a memento from her mother had the research date on his experiment, thus explaining why she was being targeted. As their line with him was about to be disconnected, the man begged to know if his research had been successful before being cut off. After returning home, they informed all their comrades everything they had discovered while omitting any mention of her parents to Koneko, she willingly gave her hair clip that was lend to Ajuka. Le Fay and Kuroka had just returned from the depths of China’s Youkai world, they soon informed Kuroka that her sister was being attacked by Grim Reapers and will also come after her, Rias then talked to her in private about what they uncovered about her parents. Rias had come down to bathe but didn't enter as she overheard Issei and Koneko having a deep conversation, Koneko noticed her as Rias apologized for unintentionally eavesdropping, Koneko left the bath and gave her space alone with Issei. As Rias entered the bath with him, Issei also told her that he will be cheering for her, Rias winked as she undauntedly said not to hate her if she were to defeat his rival. They were about to kiss when the Church Trio had also came in and unintentionally interrupted the moment, Issei and Rias simply looked at each other and laugh.

On the day of Rias and Vali's match at the Fafnir Stadium within the Fallen Angels’ territory of the Underworld, the game played was announced as Board Collapse which implied that the field will begin to collapse starting from both ends. As the game goes on, Issei and all their comrades acted as guards around as Tobio suspected that the Grim Reapers will attack again.

During the match, Rias was approached by Vali only for Crom step in as he wishes to be his opponent. Rias tells Crom that in this tournament he will be replacing Issei and will allow him loose to fight Vali. After leaving Crom to Vali, Rias and Gasper sees Fenrir in a rooftop of a building and they prepared to face him. Rias and Gasper were overwhelmed by Fenrir’s incredible speed and watched as he gets enveloped in his gray aura as he returns to his prime state. Rias and Gasper chanted together and Rias gets cloaked by Gasper’s darkness similar to the armors of the Longinus and calls it Forbidden Invade Balor the Princess. Rias attempted to freeze Fenrir’s movement but he managed to release himself using his gray aura, Rias teleported to the building and unleashed her power of destruction with combining it with the power of darkness thus destroying the building while launching it at Fenrir but managed to dodge the attack. Rias started to lose stamina in her Balor form as she continued to fight Fenrir, but Gogmagog arrived to assist him and shoot her with lasers forcing her to use her demonic power to deflect them. Rias and Gasper watched as Gogmagog destroys the building where Valerie is and Vasco arrives to assist Rias in her fight against Fenrir and Gogmagog. Gasper separates himself from Rias as she reaches her limits and tells her she needs to announce her retirement, much to Rias’s protest. Rias begrudgingly announces her retirement, this allows Vali and his team to win the match.

Rias gets disappointed with her loss and losing front of Issei but he comforts her that she puts up a fierce fight against Fenrir. She gets approached by Koneko who decided to use her real name Shirone from now while also using Toujou as her surname, with Rias agreeing to her wish. Rias later agreed to Kuroka also wanting to inherited Toujou as her surname. Rias watches as the girls fight over Issei’s kiss and believes if she and Issei kissed she will eventually recovers from her injuries.

In Volume 25, Rias been sending her protest to Asgard because of the Norse higher-ups decision to have Rossweisse marry the current chief-god Vidar due to his family’s lineage is in crisis. After the argument the Asgardians agrees about not having them engaged but still want Rossweisse to attend the marriage meeting. During at college of Kuoh Academy, Rias and Akeno noticed Issei paying them a visit and introduce him to their new friends in college as their boyfriend, shocking Issei. Rias reveals she doesn’t agree with the marriage meeting between Rossweisse and Vidar but Issei is currently her master and asked him what is Rossweisse to him and Rias goes to do the bill, leaving Akeno to discuss with Issei.

Rias walks into Issei’s room and informed him and his team that been summoned to the vip room by Ajuka in order bring both teams to the training ground in a smartphone game called Belzebut for them get stronger. After both teams were taking a break, Rias started to think about Issei and Rossweisse who was blushing after Ravel says he was training for her sake and with Rias saying he forcefully took her back after she was engage. She was unable to return to the Hyoudou Residence because had things to do in the Underworld so she stayed there with Akeno. Rias and her team journeyed together with Issei team to Valhalla in Norse mythology to watch and cheer for them facing Team Leisure of the Kings. Rias and her team celebrated at the Hyoudou Residence for passing the preliminaries along with rival teams. When the girls fight over Issei, he was sent flying to Rias’s chest and she congratulated him for entering the main stage of the tournament and he also congratulated to her as well. She reminded Issei that if they get a match she won’t go easy on him, but he’s a aware and says give their best and the two expressed their love for each other.

Rias reappeared in True Volume 1, announcing to the people of the Underworld of her engagement to Issei, which causes a lot of people ask questions about their engagement until they ended the conference because they couldn’t answer their questions. Rias and the group arrive at the park where Issei is after a group of devils and help him transport them to the Underworld. When discussing about Hades and the devils, Rias and the others listen to Vasco’s opinions and she and Ravel became shocked when he mentioned about Lilith being involved despite her being destroyed in the legend. After the discussion, Rias watched as Xenovia and Irina bicker over gets the right to sleep beside Issei and later reprimanded Akeno when came to sleep with Issei, so all the girls sleep together with him. She and the group arrived at the town where the devils were residing and she took some of them out using her power of destruction, she and the other girls later became surprise when Issei, Ddraig, and Bova were in pain because of a girl was singing until she was stopped by Rossweisse’s hypnosis. Rias and the group were astonished to learn from Ajuka that the girl is Ingvild Leviathan, a descendant of Leviathan and a half-human and plus wielded one of the new Longinus Nereid Kyrie. When Ingvild woke up, Rias and the others took her to the beach on a unhabited island with a barrier being placed by Rossweisse. When Issei stared at Ingvild, Rias noticed he was making a face of wanting to protect her and before they can eat, they were interrupted by the goddess Nyx. Issei was attempting to dress break on Nyx, but Rias stopped him from doing it because she figured out that she was waiting for him to use his technique, which Rias earn the praise from the goddess. Nyx reveal the reason of Issei’s technique were ineffective because of her Godly Virgin Killer Clothes, which causes Rias and the others to become shocked about Issei’s techniques didn’t work because he is a virgin. Before Nyx takes her leave, she warns the group about what to do with Ingvild and her brainwashing magic.

Returning to the Hyoudou Residence, Rias inform Ajuka about Nyx’s actions and received permission from Apollon about defeating her under the condition they seal her away, the girls began to fight over Issei to help him lose his virginity so he can fight Nyx, until Ravel suggested that Rias should be Issei’s first partner, surprising her but also agreeing as she doesn’t want to be overtaken by Akeno and Xenovia. Heading to Nyx’s location, a horde of devils came and attack the group with Rias defeating them with her power of destruction. Rias watches the fight between Issei and Nyx until he steps out so he leave Nyx to her and Rossweisse. Through communication, Rias's breasts as well the other girls began to glow as Ingvild sings for Issei and powered him up so he can defeat Nyx. After Nyx was defeated, Issei’s queen piece started to glowing in crimson color and direct at Ingvild, which Rias believes that Issei found a suitable servant and becomes astonish when Ingvild grows out eight devil wings because of her Leviathan lineage. Rias and her team and Issei team travels to the Agares territory for the tournament and learned that she will be facing Issei in the first match, with Rias and Issei declaring to defeat each other.

In True Volume 2, Rias appeared in Issei’s dream of him in his wedding ceremony with his brides and Rias was wearing a crimson wedding dress, and reminded that he shouldn’t be gawking around. After Issei seen his first and second group of his brides, Rias informed to Issei that he still has many brides that are going to take part of the wedding ceremony. In the morning, Rias and Issei chat about how she used to give him a strict morning training a year ago that helped Issei became stronger and recalls about the training camp they used before the rating game against Riser and his peerage, after the chat they exchange morning kiss.

Rias took part of the Oppai Dragon show and rather playing the role as helpless Switch Princess, she assist Issei in his fight against Marshal Phenex by enveloped in a light to change into her battle form and almost accidentally said Riser’s name in the stage.