A year after remarrying, Rieko is an obedient wife in front of her husband, Tatsuo. However, it seems that Tatsuo doesn't like his son, Kenta... He thinks of Rieko not as his mother, but as a woman, and often secretly releases his overflowing sexual desires next to her as she sleeps. Rieko notices this but pretends not to notice. However, she feels so sorry for his honest actions that she ends up having a relationship with him. Mother and son, she knows it's forbidden, but her raging desire knows no bounds...