Minori is a female student whose only good point is her earnestness. One day, while practicing for her club on the rooftop, she witnesses Meguro, a struggling student, misbehaving and warns him. Her homeroom teacher, Takimoto, also appears and scolds Minori, but Meguro has built a terrible collusive relationship with her, where he seduces female classmates and offers them to Takimoto in return for improved grades. The two men then set their sights on Minori, calling her in to discuss her further education, and pinning her down...