KAORI is a mother living with her husband and son. However, her son has become reclusive due to the lasting effects of past bullying. One night, he accidentally encounters KAORI in the changing room right after her bath, and upon seeing his mother's voluptuous body, he instinctively awakens to his own desires. Realizing her son is now a young man developing masculine awareness, KAORI decides to nurture his emerging sexuality. From that moment on, a new relationship begins to unfold between mother and son.