High School DxD EX is NOT Season 4, so stop asking!!!
Summaries for High School DxD EX
Part 1, Part 2
Part 3
Part 4
Part 5
Part 6
Everyone, you must get along with each other okay――。
Mother Asia is always a kind person――。
What's about to say now is something that must never be known by the public。
Despite so, the truth will someday be necessary in the anticipated future、 so the recording alone will be done。
Yes、 this is a story that mustn't be spoken of、 a forbidden tale――。
――Grigori First Governor General ・ Azazel
High school D×D
×× years from now、 a big war will occur。
Because of that a certain imprisoned individual revived himself then。
That person is……Asia……san……no、Asia・Argento-san is……tsu！
――A mysterious black haired ○○ enveloped in Holy Lightning
Appearing in front of Azazel is――a nostalgic aura donning、 mysterious boys and girls。
Azazel first Governor General、 we were told by our 『mothers』 to come and meet you。―― Mysterious ○○ in possession of Holy Sword Durandal Ⅳ
The mysterious young boys that suddenly appears.
I see、 you all are――。 I understand、 to depend on me。 That's something those guy will think of。―― Azazel
They relied on Azazel。
Those people、were looking at me with such sad eyes。……but、 they don't feel like strangers。―― Asia Argento
Asia……san will definitely be rescue！
……This unpleasant feeling、 as expected、 it's not just them that guy might also come。――White Kimono cat ears ○○
Just what i want。 I won't hold back。――Black kimono cat ears ○○
Regardless of the era、 those boys and girls inherited the will of their parents to fight。
……To think that there's another Holy Lightning user aside from me and my father……。――Himejima Akeno
The series of mysterious events happening in Kuoh Town、 behind the shadows are those mysterious boys and girls――。
Guhahahahatsu！It seems like the 『red guy』 did not come here！―― 《○○七曜》Reds Lord of the 『Four Generals』 Garuvuarudan (Seriously not sure about this part)
The arrival of mysterious enemy that came to attack the Kuoh Town's Devils much to their bewilderment.
The power that hasn't been felt before……。 What is this organism！？―― Rias Gremory
The 「people」 the young boys are chasing is something unseen and unheard of before.
This organism……magic has no effect on it！ No、 is it because it's something beyond our recognition……？―― Rossweisse
……Senjutsu and Touki isn't working？ Just what is this……？―― Toujou Koneko
An auraless being, even magic circle and senjutsu have no effect on it――。
I finally meet those people! Now, i'll just have to begin disposing off those 『○○』！ Amen it is！――A chestnut haired ○○ with Angel and Dragon wings.
Except, the 「enemy」 is clearly showing hostility and murder intent as they attack the Occult Research Club。
Proceed the plan without hesitation. This is all for our God――【メルヴァゾア】さまのお導きだろう。――《○○七曜》レッズォ・ロアドの『四将』ルマ・イドゥラ (Once again dunno)
The name of the God they spoke of ―― was not one of this world.
The swordsmanship is similar to mine。 Just who are those people ――。―― Kiba Yuuto
Of course, master. I was taught by you.
This is a tale that can't be told on the main story――。
The mysterious group of boys and girls that Azazel encounter――。
is finally released in limited――。
……that person is always like that。
While continuing as the people's heroes, is full of openings……っ！
That's precisely why i'll deny that person！
――Crimson haired young swordsman.
Crimson colored hair and Red Dragon's aura……。
Who, who is that guy……？
――Hyoudou Issei
ハイスクールD×D EX -イクス-
Crimson haired Sekiryuutei
7月24日より、「ハイスクールD×D BorN」BD/DVD特典小説にて全６話展開開始――！ (Too lazy to translate this)
……You'll chase us to this extend, the accursed crimson hair clanッッ！
――The young men chases ○○○○
I'm not so naive as my father.
Do you think i'll do something as half baked as capturing you？
Even if, it's ○○ ―― I'll cut you here and destroy you！
――Crimson haired swordsman