Kosuda is an ordinary, unassuming high school boy whose quiet existence is upended when he catches the eye of Yamada, one of the school’s most popular and attractive girls. Unbeknownst to Kosuda, Yamada harbors a massive, obsessive secret: despite her stunning looks and worldly facade, she is an intensely inexperienced virgin. Driven by a desperate desire to shed her uninitiated status and conquer her teenage anxieties, Yamada sets her sights on Kosuda, viewing him merely as the most convenient and non-threatening vessel to achieve her ultimate goal—having her "first time" with a hundred men, starting with him.Yamada’s motivations are fueled entirely by a warped sense of teenage pride and intense
peer pressure, leading her to formulate increasingly absurd, over-the-top seduction strategies. However, because she is hopelessly naive and relies entirely on wildly inaccurate information gleaned from romance novels and adult media, her grand plans constantly backfire into slapstick humiliation. Despite her aggressive outward demeanor, Yamada is secretly a romantic at heart, terrified of
emotional vulnerability and deeply embarrassed by her own staggering ignorance.Kosuda, meanwhile, remains utterly oblivious to Yamada’s ulterior motives. He simply perceives her chaotic advances as bizarre eccentricities, yet he finds himself continually drawn into her orbit. As they spend more time together, the dynamic between them shifts dramatically. What begins as a manipulative, goal-oriented mission for Yamada slowly transforms into genuine affection. Kosuda’s genuine kindness, patience, and lack of predatory instincts disarm her hardened defenses, forcing her to confront the reality that she actually cares for him as a person rather than a statistic.The narrative thrives on the delicious dramatic irony of Yamada’s internal panic clashing with her outward bluster, while Kosuda stumbles through the awkward milestones of high school romance. Throughout the series, secondary characters—such as Yamada's gossipy friends and Kosuda’s perceptive peers—complicate their evolving relationship by introducing rumors, misunderstandings, and further embarrassment. As the boundary between Yamada’s feigned indifference and true romantic feelings blurs, both characters are forced to navigate the agonizingly awkward transition from strangers to intimate companions. The central tension consistently revolves around whether Yamada can drop her ridiculous charade before her pride completely ruins her first genuine chance at love. Ultimately, the story chronicles a hilariously awkward journey of mutual self-discovery, proving that true intimacy cannot be rushed by arbitrary goals or poorly researched schemes, but rather requires genuine emotional connection, trust, and the courage to be vulnerable with another person.