No one's POV
We now see Y/n arriving at Kuoh, ready to fight. She then notices the barrier around the school, knowing what it means.
Rias: Y/n, you made it! Right on time!
Y/n: Yeah. Mind explain what this barrier does?
Sona: It's a protective barrier for everything outside. Unless something disastrous happens, there will be no damage other than what happens within the school.
Y/n: I see. Any catch?
Sona: This will only work if the current conditions remain the same.
Y/n: Got it.
Sona: One more thing, but I'll keep it to a minimum. If Kokabiel does take this fight seriously, not only will the school be destroyed, but the entire town.
Y/n: Thanks. Now Rias, are you going to call your brother in?
Rias: I would, but you've proven yourself many times over, and even took down Riser's entire peerage all by yourself, than fought him yourself and won. I don't see the need.
Akeno: Rias, when Y/n called us, telling about this, I already called him.
Rias: Akeno!
Akeno: Rias, I know that you don't want to bother your brother unless we absolutely need to, but there might come a day where we won't be able to rely on Y/n, as she might be gone, or worse killed.
Y/n: She is right, Rias. Even if I am more powerful than him, let's use what we can.
Rias: *sigh* Fine. How long till my brother's forces arrive, Akeno?
Akeno: In just about an hour.
Y/n: One hour, huh? Well, a lot can happen in even the shortest time-span!
*Time-skip*
We now see the group outside, ready to brawl. As they do, they notice the magic circle that Valper is using.
Asia: What in the world is that?
Y/n: Looks some magic that is being used on those *mumbles* fake *back to normal* Excalibur fragments.
Kokabiel: You're correct. Valper's fusing the four blades into one.
Everyone turns around and notices Kokabiel floating in the air on a throne.
Rias: Kokabiel!
Kokabiel: So is big brother on his way yet? Or is it Serafall instead?
Y/n: Why bother knowing? I'll take your dumb ass down, either way!
Kokabiel: Is that so? You think have a chance at defeating me? You really are a Camore child, through and through.
Kokabiel then snaps his fingers, and a giant light spear comes into his hands, and launches it towards the gymnasium, destroying in mere seconds.
Y/n: Damn...
Ddraig: What's wrong? You scared?
Y/n: A little bit, yeah. I mean, this guy did survive a fight with God and the Devil King. Still... we're taking him down! Rias, do you guys think you can deal with Valper. I want Kokabiel for myself.
Rias: Y/n, are you sure? He's a leader class fallen angel!
Y/n: Yeah. Trust me. I mean, it's gotten you this far, why doubt me now?
Rias: Girl, I cannot win an argument against you, can I? Alright, then. But if you can't do, then we're stepping in, got it?
Y/n: Fine with me.

YOU ARE READING
Isekaied into an AU of High School DxD, but as a Girl?!
FanfictionA/n: Story covered has changed from it's original, due to me entering the final arc of this story! When a young man makes a joke wish about taking Issei's place as the Red Dragon Emperor, he gets the wish granted! At the cost of his manhood, that is.