鈴木 栄太郎

He is a math teacher who has been transferred from one girls' high school to another. Although he is a teacher at the school, he leads his life with a resolute attitude.

In fact, he is petty and short, and is the target of teasing from her students. He is easily upset by things. (He lives his school life in such a way as not to let his masochistic nature be known...)