Hiromi gets picked because the coach sees something she doesn't see in herself yet. What follows is a girl learning that the sport she came to enjoy because of someone else becomes the thing that makes her real. The brutal training isn't punishment, it's the coach recognizing potential and refusing to let her waste it, even when she'd rather just play with her friend.
Hiromi Oka enters a prestigious high school renowned for its competitive tennis program, inspired by the legendary Madam Butterfly's grace and power on the court. She imagines lazy afternoons hitting balls with her best friend Maki, but that fantasy crumbles the moment Coach Munakata spots something in her. Without warning, he singled her out for intensive training, pushing her through grueling drills and demanding technique work that leaves her questioning why he chose her. What begins as punishment transforms into something else entirely. Each brutal lesson reveals capabilities Hiromi never knew she possessed. The more Munakata demands, the stronger she becomes, her raw talent sharpening into genuine skill. Other players resent her rapid ascent, suspicious of the coach's favoritism. As the junior tournament approaches, Hiromi finds herself representing the school, caught between the friendships she's strained and the player she's becoming. This is tennis as a crucible: where talent meets determination, where an underdog discovers her own potential through uncompromising instruction, and where the path to excellence demands sacrifice nobody warns you about beforehand.