Before her husband is sent to work overseas, Yuu move into their parents' home for a while. Tadashi, her brother-in-law, feels resentful of being forced to care for his father who needs nursing care, and when Yuu offers to help with the care, he forces her to perform obscene services! The out-of-control father and son relentlessly play with each other, and Yuu loses the energy to resist, cornered...