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Kasumi, a teacher who is a married woman who is in charge of a special advance class, is stabbed by a nail from the vice-principal so as not to put her shoulder on a specific student. However, in order to help the students who have fallen out and are being bullied, he invites them to their homes and teaches them to study. At a later date, he bought the jealousy of the students who knew about it, and was struck by the students at the physical education warehouse. After the incident, the parents of the students rushed to Kasumi's home, which was determined to sue the students, and this time they humiliated Kasumi's body and mind.