A few years into their marriage, Tomoko has had sex but no news of pregnancy. She feels ashamed of her mother-in-law Reiko's gaze. Then, one day, her husband goes on a business trip for a few days and leaves the house. Tomoko feels suffocated by being left alone with Reiko. Reiko looks at Tomoko in a frightened state, with the eyes of a carnivorous animal hunting its prey. "Tomoko, I'd like to see my grandchild's face soon..." With those words, Reiko's lesbian training begins under the guise of infertility treatment...