Osamu Miya, a second-year Inarizaki High School student and wing spiker on the volleyball team, balances a calculated athletic career with pragmatic life ambitions. Born October 5 and standing 183.8 cm tall, he shares an inseparable yet competitive bond with his twin brother, Atsumu. Though initially a setter, Osamu shifted to wing spiker, forging a dynamic duo with Atsumu through their unspoken coordination. Their signature "Twins Quick Attack," executed without rehearsal, epitomizes their instinctual synergy, honed through years of shared play. Osamu’s calm, deadpan exterior contrasts with Atsumu’s fiery competitiveness, though he matches his brother’s intensity during high-stakes matches. Their relationship thrives on rivalry and mutual reliance, with Osamu openly admitting Atsumu’s deeper dedication to volleyball. Childhood flashbacks reveal a history of pushing each other’s limits, a dynamic persisting in their on-court collaborations and frequent, heated exchanges. Food consistently distracts Osamu mid-game, foreshadowing his post-graduation pivot to culinary entrepreneurship. He leaves volleyball to launch "Onigiri Miya," a thriving onigiri shop using locally sourced rice, prioritizing financial stability over athletic glory. His later decision to dye his hair black underscores this identity shift, distancing himself from his volleyball persona while maintaining ties through occasional alumni events. Interactions with teammates like Suna Rintaro and Aran Ojiro remain rooted in volleyball contexts, though Atsumu’s selection for the All Japan Youth Training Camp sparks introspection about his own path. This moment crystallizes his choice to pursue cooking, a balance of practicality and passion. Years later, he explores expanding his business to Tokyo, reflecting adaptability without severing his athletic roots. His journey traces a deliberate transition from athlete to entrepreneur, anchored by loyalty to his past and clear-eyed focus on the future.