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At ten years old, Ageha encounters a boy named Takeru, whose intense tennis playing captivates her, sparking a passion for the sport. Years later, as a high school student, she joins the tennis club, eager to pursue her newfound interest. To her surprise, she reunites with Takeru, now known as Takeshi, who is in her class and also part of the club. Despite her excitement, Takeshi ignores her and shows a dislike for tennis, creating tension. Through a three-day training session, Ageha begins to discover her own potential in the sport while grappling with her feelings for Takeshi.