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Hiromi Oka, a shy high school freshman, joins the tennis club at Nishi High, admiring the team’s star player, Reika Ryuuzaki, nicknamed “Madame Butterfly” for her elegance. Initially clumsy and overlooked, Hiromi catches the eye of the new coach, Jin Munakata, who sees her potential and pushes her into grueling training. Her unexpected selection for a match against a rival school shocks her teammates, sparking tension with senior players like Kyoko Otowa. Hiromi’s determination to prove herself grows as she faces intense drills and her own insecurities. The team’s dynamics and Hiromi’s early struggles set the stage for a dramatic journey of growth and competition in the world of high school tennis.