Rin and her husband hadn't had sex in nearly half a year. He constantly rejected her advances, citing work and fatigue as excuses. Frustrated and sexually unfulfilled, Rin began pleasuring herself alone in the kitchen. One afternoon, while cleaning the air conditioner, she lost her balance and collapsed. Her son rushed to help her, but recalling the image of her he had secretly spied on the previous night, suddenly attacked her. From that moment on, an illicit relationship began between Rin and her son. The son grew aroused by the thrill of intimacy so close to his father's presence, while Rin, responding to his desires, gradually became consumed by the affair. As the bond between mother and son deepened, their secret connection began to fill the emotional void left by her husband, giving rise to new, forbidden feelings.