Yamada, a 15-year-old girl whose identity remains anonymous, recently enrolled in Takizawa High School. Despite being considered stunningly attractive by many, Yamada grapples with self-consciousness concerning her genitalia. At the start of her high school journey, she set a goal for herself to sleep with 100 men but hesitates to do so, fearing ridicule from sexual partners. In her search for a resolution, she comes across Kosuda Takashi, also a virgin, whom she sees as a potential gateway to achieving her sexual desires. However, Yamada's naivety and lack of experience in generating attraction suggests that winning over Kosuda would be no easy feat.