Attack on Titan: But I’m Kokushibo!

[Near-invincible protagonist + two heroines + doesn't break up Aili + some original characters]

A natural disaster strikes, trapping humanity behind enormous walls.

What would happen if Kokushibo's powers came to the world of Attack on Titan?

These Titans are so shoddily designed. As an incomparably handsome man, I won't allow such ugly things to share the same sky as me.

I'll drive every last one of you out!!

(Kokushibo won't get much time onstage at first. If that bothers you, don't read.)