Birth of the Breast Dragon Emperor[]
He first appeared in Volume 5, rescuing Bikou and Kuroka under Vali's order while revealing his identity to Issei Hyoudou, Rias Gremory, Koneko Toujou, and Tannin.
In Volume 6, Arthur appears alongside Vali and Bikou, saving Asia as they were scouting the Dimensional Gap, witnessing Issei's Juggernaut Drive and the appearance of the Great Red. He then leaves the Underworld along with Vali and Bikou after reintroducing himself this time to Xenovia and Yuuto Kiba.
The Heroic Oppai Dragon[]
He reappears in Volume 7 when he his fellow Vali Team members arrived in time to assist Issei and his friends from Loki and Fenrir who retreated soon afterwards. They then had a meeting in forming a temporary alliance with the Gremory Team to battle the Evil God, during which Irina was discussing with Arthur over the last Excalibur in his possession with Kiba and Xenovia listening in on them while on alert. Later during the final battle, they fought against loki with his army and were able to kill one of Fenrir's sons before using his Excalibur Ruler to subjugate Fenrir after Vali weakens the wolf with his Juggernaut Drive.
At the beginning of Volume 12, he and the other members of the Vali Team were hiding in the Gremory Palace while waiting for Vali to recover from Samael's poison. He later attacks Hades' Palace along with the other members of the Vali Team, successfully killing many Grim Reapers under Hades. He is later seen reporting to Vali who was with Sairaorg Bael and the Gremory Team, challenging Yuuto after deeming him to be a worthy opponent for his Holy King Sword, telling Yuuto that he will fight him when Vali fights Issei.
The Legend of Oppai Dragon and his Lively Companions[]
In Volume 15, Arthur appears alongside Vali, Bikou and Fenrir inside the Carmilla Territory of the Vampires, meeting up with Azazel who was at the Carmilla Territory at that time, to discuss with Azazel about the re-emergence of the Evil Dragons, the Vampires, the Holy Grail and Euclid Lucifuge.
In Volume 16, Arthur, along with Bikou and Fenrir, battled with the possessor of the Longinus, Incinerate Anthem, and the magicians from Hexennacht. He later participated in the meeting for the formation of D×D and asked Issei if he can make a pact with his younger sister, Le Fay, in which Issei agreed to.
In Volume 19, he and the other members of Vali's Team paid a visit to the Hyoudou Residence underground indoor pool where they witnessed for the first time Issei and Rias' new combination technique. He came over to Vali adjusting his glasses as he expressed his interests in the members of the Church’s rebels as he had heard that they had members that were Holy Sword wielders. Vali then mentioned the possibility of legendary wielders of Holy Swords may also be arriving, further peaking Arthur's interests.
Arthur participated in the fight against the exorcists that rebelled against the Church. He volunteered to be Yuuto's replacement to fight against the group led by Vasco Strada as Yuuto wanted to fight against Ewald Cristaldi. Arthur was able to fight evenly against Strada although both of them were not serious. After a small exchange, Arthur backed off from the fight saying that if only Strada was 20 years younger, they would have had the best fight and left right after.
In Volume 20, Arthur and other members of the Vali Team were on a mission to find the location of the stolen City that Qlippoth is using as their base of operations. They sent Le Fay and Kuroka to inform the others who later joined the fight against Qlippoth.
In Volume 21, the entire Vali Team alongside Tobio Ikuse and Lavinia Reni were sent to the Northern Europe region to prepare for Qlippoth's attack where they battled the army of Evil Dragons and fake Scale Mails while Vali goes up against Aži Dahāka. Upon the war's conclusion when Azazel and the other Mythology leaders prepare to seal Trihexa along with themselves, he tells Arthur and the rest of his team to look after Vali while he's gone.
In Volume 22, Arthur and the rest of the Vali Team goes fishing with the Occult Research Club and Issei's parents, with Arthur helping Le Fay attach the insect to fishing rod's hook after the latter was scared. He told Le Fay that a witch shouldn't be afraid of a little insect while giving a brotherly smile.
Red Dragon Emperor of the Blazing Truth × White Dragon Emperor of the Morning Star: The True Dragon(s) of the Kuoh Academy[]
Arthur and his team participated in the opening ceremony for the Rating Game World Tournament, where they battled multiple team opponents and raised up in the brackets.
In Volume 24, all members of Vali's Team faced off in their next match against Rias and her peerage. When Fenrir, Bikou, Vali and Gogmagog were unable to defeat Vasco Strada who easily overpowered them, Arthur decided to battle Vasco himself as he advised Vali to take Fenrir and head to where Rias and Crom Crouch are. Arthur and Vasco fought with each other in a sword match while expressing a grin of delight on their faces.
Both swordsmen hold out for a while, but Arthur runs low on stamina as he kneels down every time he blocks an attack from Vasco's sword, even when he used his sword technique to strike at him via spacial portals, Vasco was still able to avoid each blow. While Vasco complimented Arthur's skills as a swordsman, he also lectures how they've been tainted by a slight sense of vanity. Refusing to give up, Arthur channeled holy aura into his blade again and let loose a holy wave, however this move was canceled by Vasco's Holy Fist. Believing that he will most likely lose this fight, Arthur still wished to continue to give all for the remainder of it. While Arthur wasn't retired from the game, he was shown to have collapsed on the ground from exhausting his stamina, in the end however, the winner of the game was Vali's Team due to Rias forfeiting the match.
Arthur reappeared in True Volume 4, during his team’s match in the main stage against Team Journey to the West and assisted his teammates against the first generations. Arthur and Bikou fight against Sun Wukong, but he avoided their attacks of Ruyi Jingu Bang and Collbrande, leaving Arthur to express that since joining the tournament that he’s been confronted by people that his attacks can’t reach. As Bikou and Sun Wukong collided their Ruyi Jingu Bangs, Arthur finds the opening to unleash his Collbrande and adjusted his movements when Sun Wukong dodged his attack and stopped his sword with his staff. As Sun Wukong summoned his clones, Arthur and Bikou stood their ground to fight against the clones. Arthur tried to shield Kuroka after she was captured by the water sphere by trying to stop Sun Wukong’s Ruyi Jingu Bang by cutting it, but the severed tip still managed to hit Kuroka in different directions and retire her from the match. As the first generation Zhu Bajie tried to help Sun Wukong after he’s been poisoned by Kuroka, Arthur stood in his way by colliding his Collbrande with Zhu Bajie’s rake, explaining his team intention to win by defeating Sun Wukong and he doesn’t have to beat Zhu Bajie. Arthur and his team managed to win the match after Bikou and Sha Wujing defeats him.
Arthur & Le Fay
Arthur arrived together with his team to England as they were requested to help deal with Meredith Ordinton and the Fake Two Heavenly Dragons. When Le Fay plans to fight against Meredith and learning of the Evil God Aka Manah is controlling her, Arthur decided to accompany Le Fay as her bodyguard. Arthur and Le Fay are later reunited with their father Uther, who came with the help of the CIA and MI6 and give his thanks to Team DxD for accepting his request as well as giving instructions to Le Fay and asked Arthur to protect her, which he agreed to. Heading to Meredith’s location, Arthur’s group split from Rias’ group as they would fight against Verrine, while Le Fay's group would fight Meredith; as they headed to the mansion where they encountered the Sacred Gear possessors and defeated them, with Arthur praising Le Fay that she had become stronger. Arriving to Meredith’s location at the second floor with the Sacred Gear users, Arthur protected Le Fay by deflecting the Holy Nails and continued to deflect the other Holy Nails with his speed. After Le Fay attached the anti-Longinus ring on Meredith’s arm and Aka Manah came out of her body, Arthur got the chance to slash the Evil God by heightening his Collbrande to cut him as he disappeared.