A few years into their marriage… although they had sex, there was no news of pregnancy, and Tomoko felt the gaze of her mother-in-law, Reiko, making her feel uncomfortable. One day, her husband went on a business trip for several days, leaving the house empty. Tomoko felt suffocated living alone with Reiko, just the two women. Reiko stared at Tomoko, who was frightened, with eyes like a predator hunting its prey. "Tomoko, I'd really like to see my grandchild's face soon..." With those words as the starting point, Reiko's lesbian training under the guise of infertility treatment began…
