Nanami Kawakami moved to her current house due to her husband's work. Perhaps because of this, she had no friends and was busy with housework as a full-time housewife. One day, on her way home from shopping, a neighborhood child helped her carry a heavy load. As a thank you, she invited the child into her house and treated him to a snack. From that day on, the number of children increased to three, and they began coming to play in turns, claiming to be helping out. Nanami was happy that she didn't have any children, but the children had other plans.