Female teacher Kyoko gets caught in a gang of delinquents' conspiracy. After helping a bullied student, she becomes the target of their revenge and is lured to a classroom late at night, where she is restrained and brutally assaulted. Desperately resisting at first, her resolve gradually crumbles under their relentless teasing and stimulation. From then on, she is dominated by them during class, after school, and deep into the night—repeatedly raped over and over. Morality fades away as Kyoko sinks into the depths of pleasure, succumbing to humiliation and desire.