After losing her husband following remarriage, Hitomi raised her two sons alone. Her eldest son and his wife live with her, and one day she accidentally catches them deeply immersed in a passionate affair in broad daylight. Mesmerized by the scene, she begins masturbating and reaches climax. However, her actions are discovered by the couple, who confront her. Upon learning the situation, her younger son appears to comfort her, and the two lock eyes. Overwhelmed by the warmth and tenderness of her son's gentle touch, she gradually surrenders her body to him. A warm, intimate bond quietly begins to bloom between them.