On Miyu's way to school, Mamoru, a classmate who lives nearby though a bit far from her route, gradually develops a growing interest in her body. He starts by touching her chest and panties during doctor play, then progresses to examining her virgin pussy for the first time—his curiosity becoming increasingly intense each day. Eventually, the two engage in their first sexual act, pressing their inexperienced genitals together. What began as innocent curiosity slowly evolves into a deeper, more intimate relationship.