Kyoko lives an ordinary life until one day she begins helping her son with masturbation. At first, she thinks it's just a temporary situation, but her son's desires grow deeper and soon evolve into a forbidden mother-son relationship. As her son awakens to the pleasures of sex, Kyoko, feeling her body come alive again after a long period of sexual emptiness, begins to forget her past sexless marriage. A new, intense emotion blooms between them, transforming their taboo desires into an insatiable craving. Through the impulses and pleasures they experience, mother and son forge an intimate bond—unspoken, profound, and utterly forbidden.