Sakiko Hanamura is a full-time housewife living with her husband Akihito. Their relationship is by no means bad, but Akihito is too busy with work and rarely pays her attention, and her days of frustration continue. One day, the two enjoy their marital relations at night for the first time in a while. Sakiko writhes, fully using her frustrated body. The man living alone on the first floor, an elderly man named Yoshio Tamura, does not fail to hear those moaning voices, and he listens in attentively…