Makoto Otobe, a former national boxing champion, currently teaches gym at Ryo Takagi's school. He initially appears as a strict educator, voicing disapproval of Ryo's carefree attitude and natural fighting talent, specifically troubled by the young man's inner rage and capacity for uncontrolled violence.

When Ryo resolves to pursue boxing seriously, Otobe agrees to coach him under one condition: Ryo must redefine "B.B." from "Burning Blood" to "Best Boxer," marking a transition from destructive brawling to disciplined sport. Otobe devises an untraditional training program tailored to harness Ryo's aggressive instincts, converting them into focused boxing technique. His coaching philosophy emphasizes redirecting Ryo's volatile emotions into productive athletic growth instead of outright suppression.

Serving as Ryo's trainer, Otobe provides strategic mentorship, guiding him from street fighting to regulated competition. He acts as a stabilizing influence, insisting on discipline while recognizing the value of Ryo's passionate drive when channeled within boxing's structured framework.