Anna is divorced and lives with her son Shuichi. Shuichi has become interested in sex, and perhaps because he lives in a single-parent household, he has become interested in older women. One day, Anna witnesses Shuichi masturbating while watching an incest DVD. Shocked, Anna scolds Anna, and he runs away from home... A few days later, when Shuichi returns home, Anna invites him to take a bath. Anna is touched by Shuichi's feelings as he bares his body and Kokoro to her and talks about his love for his mother...