When her brother-in-law's family returns home for a class reunion and his wife, Maika, offers to help care for his ailing father, Kenta grows increasingly resentful. To avoid caregiving duties, Kenta forcibly demands that Maika serve as his father's sexual outlet, taking advantage of his brother's absence to spiral out of control. He forces Maika into humiliating sex with her father-in-law, subjecting her to relentless sexual servitude with no end in sight.