After marriage, Mari quit her job to become a housewife and was living a happy life. However, she had one problem: living with her vulgar father-in-law. On days when her husband was away, being alone with her father-in-law caused her immense stress, prompting her to decide to return to work. But even after coming home from the office, the only person waiting for her was her father-in-law. Exhausted and trying to sleep, Mari was suddenly assaulted by her father-in-law, who used her husband's absence as an excuse to take advantage of her vulnerable state. From that day on, every time they were left alone together, her father-in-law violently raped her again and again.