A high school girl consults her good friend, her tutor, about her sexual problems. The teacher tells her that if she is too sensitive during sex, boys will dislike her, so she decides to do some secret training. Excited by the reaction of the high school girl, who is not used to sex, the teacher uses various premature ejaculation improvement training such as kissing, fingering, and cunnilingus to turn the high school girl into a lesbian!