You go to Jujutsu high school. Your teacher hates you.

You were talking in class with one of your friends. Which in result got you to detention. You went to the Principal's Office. There was Nanami. You'd have to stay there with him till school ended. He was strict and serious. You often got in trouble so it wasn't a surprise you were here.

"What did you do this time?" He asked, seeming almost annoyed that you were here again.