Wataru, having failed his college entrance exam, is now facing a second year of academic setback. Seeing his struggle, his father asks Kanako, the wife of his colleague, to become Wataru’s private tutor. As lessons begin, Kanako kindly guides Wataru through his studies, but he finds himself completely distracted by her alluring presence, unable to focus on academics. During breaks, he starts pulling unexpected and lewd pranks on her. Eventually, Wataru takes a bold step—intentionally soiling Kanako’s clothes, convincing her to take a bath, and handing her a micro bikini as a replacement outfit.