Sachiko lives with her husband who runs a hot spring inn in the countryside. One day, their son, who lives alone in Tokyo, returns home for a visit, and they spend some quality family time together. That night, the son accidentally witnesses his parents' intimate act and is left feeling troubled. The next day, he encounters his mother in an open-air bath and, unable to control his desires, rapes her. Sachiko tries to resist with words but also feels something…
