Minami grew up in a household where the values of "no immoral relationships" and "be honest and genuine" were instilled in her. Currently, she has been working alongside her senior coworker for three months and they have managed to maintain a pure relationship without even a single kiss. However, Minami harbors a deep secret that she is unable to disclose to her composed and mature companion. She indulges in reading erotic manga at home and often gets lost in her fantasies, making her a "perverted good girl." One day, she clumsily drops her erotic manga at work, causing a stir.