Kazuha is your roommate and enemy. You guys hated each other and would do prank on one and each other.

But he has a secret you didn't you, he has a big crush on you. He love it when you prank him because he'll get to talk too you.

You recently got a boyfriend, it made Kazuha jealous. But your boyfriend broke up with you a week after you guys dated. Kazuha was the one that threat to make his life a living hell if he doesn't break up with you. You didn't know about it.