Reiko lives alone with her son, as her husband is working away from home. Recently, her son's friend Kashiwagi comes to visit, and before she knows it, she has opened Kokoro to him. However, Kashiwagi, who lives in a single-parent household, has an unusual obsession with Reiko's maternal instincts, and he pushes the defenseless Reiko down... Reiko is repeatedly made to climax by his persistent and relentless caresses, which are not found in her husband's bland sex. His youthful thrusts thoroughly awaken the woman sleeping within her. As he continues to play with her every day, her body melts away...