Kasumi is a 26-year-old woman who works at a convenience store on campus. She is rumored to have a sexy body and lots of experience, but in fact she has never done it before. Now that he is a university student, Iwakura-kun, a former child actor who she has been supporting for nine years, appears in front of Kasumi!? He asks her to "coach him through his first experience" in order to prepare for his role!?