Hirai's wife, who lives downstairs from the apartment, has run away from home, and Hirai comes to visit the Isshiki family to see if he knows anything. - Hirai, who expresses his anxiety, is unable to suppress his emotions at the loneliness of being without his wife and Momoko's kindness, and pushes her down. - Momoko's body, which has not been with her husband for a long time, is immediately swallowed up by Hirai who acts on instinct... - The pleasure she hadn't felt in a long time brought forth a hidden desire within her. - Before she knew it, Momoko began to desire Hirai's body for herself...