Beyond her role as a mother, she struggles with the allure of being desired by her son as a woman. Late at night, unable to sleep, she indulges in masturbation and falls asleep in that state. Her husband discovers her like this, and she pleads, "Don't tell our son." But her son, Naoki, ends up secretly watching her, exposing her secret. Using it as leverage, Naoki demands his mother's body—yet she has already begun to desire him. A forbidden love begins to unfold.