Kazuma Fujioka is the quiet and serious captain of Rikudo University's track and field team. A fourth-year student and celebrated running prodigy in intercollegiate meets, he possesses a tall, solidly built frame with black hair and black eyes, creating a physically imposing presence. Despite his reserved demeanor, he exhibits strong determination and a focused drive toward his goals. Fujioka demonstrates perceptiveness regarding his teammates' challenges, offering them support and encouragement. This understanding of team dynamics is evident when he advises Kakeru Kurahara to temporarily coach the Kansei University team.

Fujioka emerges as a key rival to Kakeru Kurahara, particularly during the Hakone Ekiden relay. At this event, he openly declares his intent to break the section record for his leg, directly challenging Kakeru, who confidently responds that he will surpass Fujioka's time shortly after. Their rivalry highlights a mutual pursuit of excellence. Fujioka is established as a prominent figure within the series' competitive running circuit, defined by his athletic prowess, leadership at Rikudo University, and his respectful yet intensely competitive dynamic with Kakeru.