Kurose Ryotaro is a high school student who dreams of becoming a teacher. He admires his teacher, Mr. Shiratori, and is subjected to severe bullying. One day, he is told on the roof by the bullies, who are afraid that their bullying will be exposed. ''Will you kill yourself before your bullying is exposed?'' And. The situation that he couldn't believe his eyes made Kurose step away from the upset… 'Hey, sir. Even so, can't I just do it again?