Shukei, who lives alone, has a new neighbor named Sachiko. She wants children but has always been shy around strangers. Lately, her husband has been uncooperative with making babies, and her anxiety about child-rearing is growing. One day, Shukei confides in her about these troubles and suggests that Sachiko practice child-rearing. He offers himself as the practice subject… Sachiko takes it seriously and treats Shukei like a child, but seeing the large breasts in front of her, Shukei's reason cannot be restrained… From then on, secret meetings between the married woman and the young man under the guise of child-rearing practice begin…
