Shota-kun happens to see a beautiful mother at school. Although he has never spoken to her before, being the mother of his classmate, he immediately finds out where she lives and breaks into her house when her son is away. He plays pranks on her while she's washing dishes in the kitchen, clings to her to take a bath together, gets sex education from her while doing homework, and even sneaks up on her while she's sleeping for a relaxing time... This series offers a surprisingly realistic storyline where Shota-kun does as he pleases with someone else's mother.