This is the story of one very naughty summer. At an adult study-camp role-play, the virgin protagonist meets Rena, a cute female tutor with glasses, a Kansai accent, and enormous breasts he cannot stop staring at. Older attendees tell him an urban legend: selected virgins receive a secret special lesson from her. He laughs it off, but when he heads to the restroom, Rena suddenly appears and the rumored private lesson begins.