Girls in puberty gradually begin preparing to become women. Hino Iori is no exception—she still maintains her innocent, girlish charm at school, yet inside she's driven by uncontrollable desire. The uncle who lives nearby is kind and always gently checks in on her, making him a special figure in her life. Their bond slowly deepens as she takes her first steps toward adulthood. Eventually, overcoming taboos, she makes the decision to go with him to a hotel.