- Voice Actor (CV)
- Hiroyuki Yoshino
- Gender
- Male
- Age
- 17-18
- Birthday
- June 10
- Role
- Supporting
- Identity
- Third-year vice-captain and ace outside hitter of Aoba Josai High's volleyball club, later pursuing a career as a sports trainer for Japan's national team
Personality
Resolute
Dependable
Blunt yet sincere
Widely respected
Hajime Iwaizumi stands as the backbone of Aoba Josai's volleyball team, combining a devastating spike with an unshakeable mental fortitude that keeps the squad grounded. As childhood friend and on-court counterpart to Toru Oikawa, he brings a grounded perspective that balances the team's dynamics. Whenever Oikawa loses focus or pushes himself beyond his limits, Iwaizumi is the first to intervene—delivering harsh but genuinely caring words that cut straight to the point. His well-rounded skill set and natural leadership have earned him deep respect from teammates and underclassmen alike.