Kanji Koganegawa, a first-year setter for Date Tech High’s volleyball team, combines a towering 193 cm frame and muscular build to anchor the squad’s "new iron wall" alongside Takanobu Aone and Kenji Futakuchi. His physical prowess—including a 340 cm jump reach, possibly outdated due to ongoing growth—fuels aggressive plays, contrasting with sharp eyes, dyed blond hair styled with a black fringe, and black eyebrows, later cropped shorter post-timeskip.

Raw power and enthusiasm drive his play, yet technical inexperience surfaces during the Spring High preliminaries against Aoba Johsai: high sets and predictable dumps draw Futakuchi’s ire. Determined to adapt, he shifts tactics post-feedback, favoring forceful spikes over finesse. Mistakes trigger earnest apologies, even self-punishing with 100-lap sprints.

At Shiratorizawa’s First-Year Camp, his sociability shines, bonding with Shoyo Hinata while studying rivals’ tactics. Observing Hinata’s agility and Kunimi’s calm, he refines read-blocking strategies, though Ushijima’s spikes expose lingering technical gaps. A practice match against Karasuno sparks admiration for Kageyama’s precision, prompting stricter hand-care habits—despite Futakuchi’s skepticism.

Post-graduation, he joins the Sendai Frogs (V.League Division 2) while working at a Miyagi auto plant, mirroring Kei Tsukishima’s dual path. His relentless work ethic aligns with a straightforward personality, persisting through early setbacks.

Relationships define his journey: Aone’s quiet support contrasts Futakuchi’s sharp mentorship. A friendly rivalry with Hinata and respect for Kageyama’s skill propel his growth. Off-court, katsudon fuels his energy, and the nickname "Kogane" cements his reputation as an eager, if occasionally overzealous, teammate.