Ryō Mizushima, a high school student with brown hair and light-blue eyes, dons a standard blue badminton outfit. His name—combining the characters for "clear" (亮) and "water island" (水嶋)—mirrors his composed demeanor and origins.

In junior high, his quiet determination for badminton often went unnoticed, resulting in modest tournament outcomes despite relentless practice. Though raw athleticism secured him a prefectural tournament spot, the absence of strategic guidance stunted his potential. This changed when Jin Ebihara, coach of Yokohama Minato High’s powerhouse badminton team, recognized his latent talent. The school’s reputation, amplified by elite player Kento Yusa—Ryō’s idol—offered the challenge he needed.

Encouraged by his older sister Rika, who supported him during their parents’ absence with a blend of warmth and discipline, Ryō embraced the opportunity. At Yokohama Minato, he joined a roster of exceptional players: the nationally ranked Higashiyama twins, analytical returnee Koki Matsuda, and fiery Shohei Sakaki. Ebihara’s mentorship sharpened his technical precision and competitive mindset, transforming casual enthusiasm into focused ambition.

His growth hinges on shedding hesitancy to embrace rigorous training, aiming to surpass Kento. Team dynamics and high-stakes matches forged both camaraderie and tenacity, though clashes in coaching philosophies and personal hurdles strained his resolve. Ryō’s path charts a steady ascent—harnessing innate skill through disciplined effort to withstand the crucible of inter-high tournaments.