Kawakami Nanami moved to her current home due to her husband's job circumstances. Perhaps because of this, she had no friends and was busy with household chores as a full-time housewife. One day, after shopping, she helped a neighborhood child carry heavy luggage. As a thank you, she invited the child to her home for a snack, and from that day on, three children started coming to play in turns, calling it helping out. Nanami, who had no children and was delighted, did not realize that the children had different intentions.
