Kiyoka Suzumoto, a diligent student representative, falls victim to the predatory schemes of her substitute P.E. teacher, Inui. After tricking her into consuming an aphrodisiac disguised as a sports drink, Inui catches Kiyoka masturbating at school and uses the footage to blackmail her. Under the guise of "teaching her a lesson," Inui forces her into a series of non-consensual sexual encounters, establishing a cycle of abuse and control.