(Four days have passed since the victory of Rias' Peerage, a F21C Stork found it's way to the underworld, bringing Ryu Black alongside the N-WGIX.)

Foundation Pilot: I'll go over the mission. The Foundation deemed Rias Gremory and her peerage as perfect hosts for the project, and they require you to capture them alive.

Ryu: Understood. I'm ready..

(The suspension cables removed themselves to allow the N-WGIX to fall below.)

Ryu: (Lands his mech on the ground) All system checks are complete. Main system, activating combat mode.

(Who is this individual, and what is the project the one who seems to be his superior told him about? Whether things will change for better or worse, it's just a matter of time until this question is answered.)

https://youtu.be/Q0FOg8I5RZI

(Ever since Rias had won her rating game, she could finally spend her time with the love of her life. The Phenex Clan wanted Claire to become the heiress of the Phenex Clan since her brother lost, but she politely declined, claiming that she doesn't want to be loved for her status, but for who she is. Their mother understood as she supported her decision to date Y/N;)

(At present day, everyone is seen in the class, ready for their lesson as they were glad things got settled a bit. Suddenly the professor comes in.)

Professor: Ok, class, today we have a new student here, so please, treat him well.

(Suddenly a blue haired boy comes in as he looks around. Sarada feels something fishy about him like he was bad news.)

Professor: Please, introduce yourself.

Chris: Hello, I am Chris Dragonius. I hope you all treat me well.

Professor: Now please, take a seat.

(He then takes a seat next to Y/N as Claire glares at him. He notices that, and grins.)

Chris: Hey cutie, it's been so long, eh?

Claire: Hmph! To your existence, I say no thanks.

(Y/N raises an eyebrow as he wonders how Claire knew the new student. Speaking of which, the male individual seen before was sent to infiltrate Kuoh so he can resume his mission.)

Ryu: Tch, great. I'm late.

Professor: Uh... just introduce yourself!

Ryu: I'm Ryu Black, and I don't expect anything from anyone, okay?

Professor: Okay...? Now take a seat.

(Ryu merely nods as Sarada has suspicions about him, but the former merely ignores him and focuses his gaze on Issei.)

Ryu: (in mind) There you are... Issei Hyoudou, right? You'll be pretty useful for the Foundation's project.

(Some moments later, the classes ended as Y/N, Issei, Asia, Kuroka, Koneko and Claire's Peerage meet with Rias and Sona along with their respective Peerages. Unbeknownst to them, Ryu is secretly following them.)

Claire: You four must be wondering what's between me and the new student, right?

Y/N: You mean that jerk?

(Rias and Sona sigh.)

Rias: So he's here.

Issei: You know him too, Buchou?

Rias: Chris Dragonius is half human and half devil. His father was a devil while his mother was human. His father was the last of the Dragonius Family, a powerful devil family that had the ability to create anything they wanted in reality.

Claire: They were power-hungry, and due to his father having the power to do as he wished, he wanted to not only the ruler of devils, but also the ruler of other races.

Rias: My brother knowing this could cause a war, tried to stop them, but they attacked him, and during their fight, he accidentally killed them, leaving Chris and his older sister, Maya, by themselves.

Claire: The Dragonius siblings became vengeful because of it, and even when Sirzechs gave them a home, they refused to get over it.

Y/N: I can understand why. Losing a family is utterly painful.

Kiba: Rias, don't feel beaten up about what your brother did. Because he didn't intend to kill Chris' parents. It was an accident.

Akeno: Yeah, he did his best to reason with them.

????: I don't need a lowly human's sympathy!

Claire: (grunts) Great... like currently owning a third of Kuoh wasn't enough, you dare insult my future husband? (realizes) Oops.

(Chris comes in while glaring at Claire.)

Chris: The Phenex's Perfect Queen did her homework, I see.

Rias: Just like me, Claire and Sona, we're not only here to learn at Kuoh, but also to look after, and since he is now a high class devil like we are and has a peerage of his own, he also owns Kuoh.

Chris: That is right, and if you think you can beat me, allow me to show my peerage.

????: I am here, little brother.

(They look to see a purple haired girl with amber eyes as she landed next to Chris.)

Chris: Oh, hi there, Maya, glad to see you here.

Maya: Anything for my little brother.

(They then have a kiss.)

Y/N: Ew!

Kiba: That's your brother!

(Meanwhile, Sarada is seen sleeping at the school's courtyard until he suddenly wakes up.)

Sarada: (in mind) Why do I have a feeling that someone is committing incest?

(Back to the group, Maya glares at Y/N and Kiba.)

Maya: Silence, peasants! This is our love.

Y/N: Hmph! More like incest!

(Chris glares at Y/N, who glares back at him as some thunderclaps are heard.)

Chris: My sister, Maya Dagonius, is also my queen. Now to meet the rest of my peerage.

(He snaps his fingers, and fourteen appears next to him and Maya.)

Claire: (stern) You're just like my brother... no, worse than him!

Erena Amatsuka (Chris' Bishop 1)

Yui Hatsunegaoka (Chris' Bishop 2)

Olga (Chris' Knight 1)

Liese (Chris' Knight 2)

Fee Kissethermit (Chris' Rook 1)

Kaede Midou (Chris' Rook 2)

Mei Myoudou (Chris' Pawn 1)

Ayane Uesaka (Chris' Pawn 2)

Riko Nikosaki (Chris' Pawn 3)

Eibel Haruisia (Chris' Pawn 4)

Yukari Sonomiya (Chris' Pawn 5)

Caryle Restram (Chris' Pawn 6)

Saizel Haurisia (Chris' Pawn 7)

Chris: These are my bishops, Erena and Yui. My knights, Olga and Liese. My rooks, Fee and Kaede. And my pawns, Mei, Ayane, Riko, Eibel, Yukari, Caryle, and Saizel.

Maya: And know your place. Because if you mess with us, you will have hell to pay.

Claire: (scoffs) I'm counting on that, jerks!

(Chris and his peerage then disappears as Claire sighs in relief.)

Claire: I couldn't stand him anymore.

Y/N: How he was allowed to get in this school is beyond me.

Rias: My brother believed that allowing Chris to be here with us, it could try and make him open up more. But as you can see, it might not work. But I don't want to file a complaint to my brother because Chris could try and frame me as trying to get rid of him for no reason.

Claire: And the fact he got a sacred gear worsens his attitude even more.

Rias: Indeed. He possesses the sacred gear Dragdeath, the extinction dragon emperor. With it, he can have an entire race die very easily. He also has the powers of an evil Kamen Rider named Killbus.

Sona: It's kinda a miracle that he hasn't used it on anyone yet, because if he did, the devil race wouldn't have been a thing anymore.

Issei: I wish I could beat this bastard.

Y/N: Calm down, brother. As much as I want to kick his ass too, he's not worth it for now.

Rias: And please don't antagonize him in anyway. Because he is a ticking time bomb. All he needs to do is to get angry, and everyone here just dies.

Claire: (smirks) Don't worry, Rias. I have an intuition that Y/N here will find a way to prevent him from killing everyone.

(Everyone, except for Claire and her peerage gets worried with Claire's words.)

Claire: Well, that's all we came to talk about. Meeting's over.

(As Y/N, Kuroka and Claire's Peerage leave, Rias and Sona turn to each other and sigh.)

Sona: Well, this is going to be hard to manage. Because now that Chris is here, we could be at the very edge of having everyone here dying.

Rias: I know. I love my brother, but why did he have to put Chris here of all places. He knows very well that Chris doesn't like me, and I also got a feeling that my peerage is about to be hunted down. This is not going to be good.

Sona: We can only hope Claire is right about what she said.

Rias: I agree...

(Meanwhile, outside the school, Ryu sees Y/N, Kuroka and Claire's Peerage leaving, and clicks some buttons on his wrist device.)

Ryu: Targets acquired. (his mecha appears and he goes inside of it) Beginning mission!

(To be continued.)