- Voice Actor (CV)
- Souichirou Hoshi
- Gender
- Male
- Age
- 18
- Role
- Supporting
- Identity
- Third-year captain and point guard of Kaijō High School's basketball team, known for his ironclad leadership
Personality
Unwavering sense of duty
Holds himself and others to the highest standards
Unbreakable mental fortitude
Completely flustered around girls
Yukio Kasamatsu serves as the backbone and driving force behind Kaijō High's basketball squad. Armed with elite-level speed and court vision that rival the best in the nation, he channels the weight of past defeats into an unrelenting hunger for victory. While his tough-love approach toward star player Kise Ryōta is well-documented, Kasamatsu consistently proves himself to be the most dependable pillar of the team when it matters most—embodying what true captaincy looks like.