After her husband's sudden death, Shinobu struggles to keep the factory afloat with her stepson Akira, but their business performance remains dismal. A bank officer takes advantage of the situation, luring Shinobu by offering a loan. When Akira discovers her actions, he berates her relentlessly. Consumed by rage, he joins the employees in subjecting her to escalating cruelty. In a dusty warehouse, she is slowly tormented and violently raped, eventually succumbing completely to their desires.