- Voice Actor (CV)
- Yoshimasa Hosoya
- Gender
- Male
- Role
- Supporting
- Identity
- Former captain of Seidou High School Baseball Club, a first baseman and cleanup hitter who, after stepping down, continues to guide the team as a third-year senior
Personality
Unshakeable composure
Leads by example
Relentless self-discipline
Commanding presence
Surprisingly poor at shogi
Tetsuya Yuuki stands as the undisputed spiritual cornerstone of the Seidou High baseball program—a leader who speaks through action rather than words. Through years of rigorous independent training, he forged a batting ability renowned for its reliability under pressure, with clutch hits that consistently steadied the team in critical moments. Though he officially stepped back from active captaincy in the second season, Yuuki refused to fade into the background. Instead, he took to the field in intrasquad scrimmages, using direct competition to ignite growth in his successors. His enduring belief that "hard work never lies" is not merely a motto—it is a legacy written in every swing he took, now entrusted to the next generation carrying Seidou's banner forward.