Hitomi lives with her only son, Shu. She desperately wants Shu to enter the same university as her husband, so one day a man who calls himself a cram school teacher comes to visit her and offers his money and body to her. As a way to take a break from studying, Hitomi helps Shu masturbate. She showers her son with abnormal affection, and the son begins to think of his mother as a woman, letting his fantasies grow. Then, one day, Shu passes the university entrance exam. He confesses, "I love you, Mommy," and pushes him down on the bed. Hitomi is confused for a moment, but it was probably only a matter of time before this happened, and she opens Kokoro and body to Shu's desires. With her own hands, she leads her son to her ripe body...