Minori is a female student who is only serious. One day, Minori comes to practice club activities alone on the rooftop, and witnesses Meguro, a fallen student, doing delinquency and warns her. Takimoto, the homeroom teacher, also appears and praises Minori, but Meguro has built the worst collusive relationship by handcuffing a female classmate and raising her grades in return for providing it to Takimoto. Then, the two of them set their eyes on Minori, called her to talk about going to school, and ...... put her body together.