I REALLY like the sound of her canon setting, that's like. Aesthetic™, holy crap.

So between that and like, her being pretty hard to anger + being in the right age range, she and Koushuu could be possible classmates/at the very least schoolmates. He needs someone to balance out his temper. ... many someones, tbh. But if they became friends he'd get protective of her sheltered lil self, if be a little tsun about it.