Kyoko, who lives in the countryside, agrees to let her nephew Tomohito stay at her home. While spending several days together as he tours the area, their routine life suddenly shifts. During this time, Kyoko becomes deeply involved in an affair with Jiro, a man from the local liquor store. By chance, Tomohito witnesses the affair, and his feelings toward Kyoko begin to change, gradually driving him toward increasingly abnormal behavior. Noticing the shift in him, Kyoko confronts Tomohito, only to receive an unexpected response.