Though married, the young wife Yui feels emotionally unfulfilled. She is pursued by her father-in-law and continues a sexual relationship with him. Lacking self-confidence, she feels a strange sense of satisfaction in giving in to his advances, even as she feebly resists. One day, her father-in-law's friend Yamagata discovers their affair. Drawn to Yui's youth and beauty, he also begins to force himself on her. Yet Yui does not strongly resist. To her, this situation feels like a natural progression.