Several years had passed since their marriage, and while married life continued, there were no signs of pregnancy. In this situation, Tomoko was constantly under the strict gaze of her mother-in-law, Reiko, and felt deeply uncomfortable in her own home. One day, her husband announced a several-day business trip and left the house. Suddenly, Tomoko found herself living alone with Reiko, suffocating under the pressure. Reiko stared at Tomoko’s anxiety and trembling with the eyes of a predator locking onto its prey. Sensing that gaze, Tomoko withdrew further into herself. Then, in the midst of this tense atmosphere, Reiko suddenly spoke words that would change Tomoko’s life forever: "Tomoko, it's about time I saw a grandchild..." With those words, a lesbian training regime began under the guise of fertility treatment, marking the start of a new, twisted daily routine.