Miki lives with her husband Kanichi, and her father-in-law, Hiroshi, who is currently undergoing medical treatment, moves in with them. Hiroshi has had his eye on Miki for some time, and rapes Miki during the day while Kanichi is at work. Hiroshi's demands, which he plays with Miki, who she cannot bring herself to tell her husband, gradually escalate, and she is forced to do abnormal things...