Mother Chisato, overwhelmed by her son's academic pressures, begins to feel emotionally neglected and lonely. One day, her son's friend forces her to masturbate while studying together, and she eventually gives in to him sexually. After so long, the physical pleasure reignites intense desire within her body and mind. Later, another friend torments her with sex toys, violently stimulating her as her son watches, leaving her writhing in helpless ecstasy. In her son's absence, she surrenders to the youthful bodies of his friends, chasing new and overwhelming sensations.