Totomaru Minowa sports blond hair and brown eyes, frequently accessorized with a lime green headband, orange hoodie, and military-print pants outside school. Passionately loyal, he prioritizes others’ well-being above personal gain, offering help freely despite his delinquent reputation—a contrast to his academic competence and mastery of Kyokushin and Shotokan Karate, skills he deploys decisively in fights.

His relationship with the protagonist begins when he intervenes against their bullies, only to challenge them upon mistaking their identity. After losing their duel, he concedes superiority, evolving from rival to devoted ally. Persistent proximity fails to clarify the protagonist’s gender for him, his naivety and fixation on friendship blinding him to obvious clues, though their interactions spark involuntary blushes or nosebleeds, betraying unspoken emotional undercurrents.

As narratives progress, he becomes a protector, collaborating against threats to their school. Subtle hints—avoidance of group activities, glimpses of gender-concealing attire—gradually unravel the protagonist’s secret. Mutual romantic feelings eventually surface, though both keep the relationship discreet to avoid disrupting their social circle.

Family pressures introduce conflict when his father demands a school transfer for academic prestige, forcing him to weigh loyalty to friends against filial duty. His journey traces a transformation from impulsive combatant to a nuanced figure balancing integrity, emotional growth, and steadfast support for those he cherishes.