A female teacher named Ritsuko attempts to get back at delinquent students but ends up being exploited by them instead. Bound and helpless in a classroom late at night, she is violently raped. Despite desperately resisting, her body gradually succumbs to pleasure. From then on, she is completely at their mercy—played with using toys during class, forced into humiliating public sex acts in front of numerous students, and even coerced into having sex with bullied students, driving her deeper into despair.