Yuuichi, whose sales performance is poor, returns to his family home and attempts to sell used cars but is ignored. His younger brother openly mocks him. The sister-in-law, Keiko, comforts this brother-in-law. Due to pent-up feelings, he rapes Keiko. Although Keiko resists his violent act at first, she eventually accepts him... In the sultry night, sweat and bodily fluids mix in a dense sexual encounter!!!
