On her first day at Nishi High School, sixteen-year-old Hiromi Oka is late and flustered until a chance encounter with a kind boy, Takayuki Todou, helps her find her way. Her attention is soon captured by a far more dazzling sight: the elegant and powerful practice of Reika Ryuzaki, the school's tennis star known as Madame Butterfly for her grace on the court. Inspired by Reika, the shy and inexperienced Hiromi joins the tennis club, hoping to become her friend, but quickly finds herself relegated to basic drills and watching from the sidelines. The club's rigid hierarchy is shattered with the arrival of a new coach, Jin Munakata, a former Davis Cup player with a cold and brutally strict training philosophy. After subjecting the entire team to a rigorous evaluation, Munakata shocks everyone by selecting Hiromi, a complete novice, as one of the five regular players for an upcoming tournament, bypassing more senior and skilled members. This decision breeds intense jealousy and resentment from her upperclassmen, who begin to bully and ostracize her. As Hiromi endures Munakata's punishing special training sessions and the hostility of her peers, she must also navigate her own deep-seated self-doubt. The romantic tension with Takayuki, a member of the boys' tennis team, adds another layer of complexity, as Coach Munakata sternly warns her that emotional distractions could derail her progress. Throughout the nine-episode series, Hiromi gradually unlocks a natural talent and mental fortitude she never knew she possessed, while her unexpected rise challenges the untouchable status of her idol and rival, Reika. The drama follows Hiromi's transformation from a timid girl into a fierce competitor, forcing her to confront not only powerful opponents on the court but also the fragile dynamics of friendship, rivalry, and the sacrifices required to aim for the ace. A special episode serves as a sequel, continuing her journey beyond the initial tournament.