Haruka is happily married to a kind and caring husband. However, she has one major problem—living with her father-in-law. During the day when her husband is away, being left alone with her father-in-law makes her deeply uncomfortable. To avoid him, she starts working outside the home to pass the time. But due to work stress and exhaustion, she sometimes returns home and falls asleep in her father-in-law's room without realizing it. Discovering her defenseless state, he takes advantage of his son's absence to begin molesting her young body. From that day on, he repeatedly exploits every opportunity to assault his beautiful, innocent daughter-in-law.