Sachiko, who has moved in next door to Shuhei, who lives alone, wants children, but has always been shy. Recently, her husband has been uncooperative in her child-making, and her anxiety about child-rearing is increasing. One day, Shuhei tells Sachiko about her troubles and suggests that she practice raising her child. Sachiko treats Shuhei seriously like a child, but there is no way she can control Shuhei's rationality because of the huge breasts that spread out in front of her... After that, a secret meeting called childcare practice between a married woman and a young man began.
