Hirai's wife, who lives downstairs in the apartment building, has run away from home, and Hirai visits the Isshiki family to see if she knows anything about him. Hirai, who exhales her anxiety, cannot suppress her emotions due to the loneliness of her wife and her kindness of Momoko, and pushes her down. Momoko's body, which had not been with her husband for a long time, was immediately swallowed by Hirai who violated her instinct. Her pleasure, which she had not tasted in a long time, gave birth to a hidden desire in her. At some point, Momoko began to want Hirai's body herself.
