After getting married, Mari quit her job and was living a happy married life as a housewife. However, she had one complaint: living with her vulgar father-in-law. Hating the idea of being alone with him during the day while her husband was away, she reluctantly returned to work. But one day, after coming home from work, she fell asleep from exhaustion in the house where only her father-in-law was present. Finding Mari defenseless, the father-in-law took advantage of his son's absence to toy with her young body and rape her. From that day on, whenever they were alone, her father-in-law would always rape her...