Hirai's wife, who lived below the apartment building, ran away from home, and Hirai visited the Isshiki family whether there was any idea. Hirai, who vomits anxiety, is unable to control her feelings of loneliness without a wife and the kindness of Momoko, and pushes her down. Momoko's body, which she and her husband were reluctant to do, was immediately swallowed by Hirai who committed instinct. The pleasure she hadn't tasted in a long time produced her inner desires. Momoko came to ask for Hirai's body by herself ....