Konatsu, a wife, is often alone because her husband Hiroki is busy at work. Her only salvation as she feels anxiety and loneliness is her father-in-law Kosaku. Whenever Konatsu is in trouble, Kosaku comes to her house and helps her out. And when her husband is at work and Konatsu has to spend their important anniversary alone with her father-in-law, she begins to feel more than just family towards him because he is always by her side. The next day, Konatsu visits her father-in-law's house and exposes her defenseless body in front of him...