After losing her husband, Reiko raised her son Ichiro alone. Naturally, she lived with unfulfilled desires every day. One day, she discovered an erotic magazine featuring mature women in her son's room. Reiko learned that her son was aroused by women of her own age, and she began to feel an indescribable emotion towards him. Then, witnessing her son's masturbation or morning erection pushed Reiko's desires to the limit...
