Fifty-something female teacher raped

Mari is a female teacher and realizes that bullying is occurring in her class, where she is in charge of homeroom teacher. He tries to find out the truth from the victim who was being bullied, but he has completely closed his heart and refuses to say anything. With his decision, Mari calls out to his home to persuade Kato, the leader of the students he was bullied, to change his mind. The serious and strong sense of justice desperately tries to persuade him, but Kato doesn't listen to what the truth says at all...