In Miki's house where she lives with her husband Kanichi, her father-in-law, Hiroshi, who is undergoing medical treatment, will live together. Hiroshi, who has been eyeing Miki for a long time, rapes Miki during the day when Kanichi is at work. Hiroshi's request to play with Miki who can't say anything to her husband gradually escalates and continues to be forced to do abnormal acts.
