Kazuma Mutsumi

Kazuma Mutsumi is the elder brother of protagonist Yuma Mutsumi, returning to his old school as a student teacher. A stark contrast to his reserved younger sibling, Kazuma is outgoing, effortlessly charming, and a self-proclaimed citizen of the world who lives life on his own terms. While he delights in teasing Yuma at every opportunity, his affection for his brother runs deep beneath the surface. His role in the story proves pivotal—by openly pursuing the heroine Hanai, he creates a romantic rivalry that forces Yuma to confront his own suppressed feelings and finally acknowledge the love he has been holding back.