High school freshman Hiromi joins the tennis club due to her admiration for Ryuzaki. Ryuzaki is a senior and the team's best player, nicknamed "Ochoufujin" ("Madame Butterfly") for her elegance on the court. However, the new coach, Jin Munakata, wants the inexperienced Hiromi to compete in an upcoming tournament. Because of this, Hiromi considers quitting tennis permanently, but deep down, she soon realizes that she loves the sport after all. She returns to the club, and under Munakata's coaching, her talent begins to blossom. Ultimately, Hiromi forms a strong emotional bond with her coach, unaware that Munakata is risking his life due to a chronic illness.