Reiko was left sexually frustrated by her husband's workaholic nature, and her affair with her son Akira only deepened her turmoil. Unable to forget the intense, impulsive pleasure, she continued their relationship whenever her husband was away. As Akira entered adolescence, he grew bolder and increasingly obsessed with sex. Reiko gradually found it harder to resist, and on the days her husband left the house, they gave in to their desires again and again.