friend's mother

My son hates studying, keeps getting red marks, and is at risk of being expelled from school instead of graduating. As a mother, Rei wanted her child to graduate from high school, but she had to prevent him from dropping out of school at all costs. With such thoughts in mind, Rei goes to the school her son attends, but the conditions the principal imposes on her are incredibly despicable. Rei reluctantly accepts the humiliating request for the sake of her precious only son's future, but when her son's friends see the whole story, Rei ends up having the worst day of her life...