Hiromi Oka, a high school student inspired by tennis star Reika Ryūzaki’s grace and skill, joins the tennis club as an insecure novice. Coach Jin Munakata’s unexpected decision to place her among the team’s top five—despite her shaky start—fuels resentment from peers, isolating her through bullying. Yet under Munakata’s demanding mentorship, she channels self-doubt into relentless training, steadily honing raw potential into competence.

Battling fragile confidence and the club’s rigid social hierarchy, Hiromi grows dependent on Munakata’s guidance, distancing herself from personal ties, including her unspoken feelings for teammate Takayuki Tōdō. Her growth peaks during a pivotal doubles match with Reika, where she shifts from craving approval to fiercely asserting her own skill, sparking a rivalry with her former idol.

National acclaim follows her All Japan Tennis Tournament victory, but Munakata’s sudden death abroad shatters her stability. Consumed by grief, she abandons tennis, retreating until Katsura—Munakata’s monk ex-teammate—guides her rehabilitation. Through introspection, she rebuilds her passion independently, disentangling it from external expectations.

Her dynamic with Ranko Midorikawa, Munakata’s half-sister, contrasts their grief responses: Ranko’s unchecked drive results in career-ending injury, while Hiromi’s patient recovery, bolstered by friends like loyal Maki Aikawa and steadfast Tōdō, underscores the role of community. Her arc balances competitive fire with self-discovery, culminating in a return to professional play with tempered resolve.

Visual motifs trace her psyche—washed-out palettes during despair, vivid contrasts in triumph—while narrative threads weave her adolescence into adulthood, resolving lingering romantic tensions and affirming her identity as a self-defined athlete. Her journey closes with her ascension as a world-class player, resilience forged through loss and rebirth.