Mono Shinobino attends Itan Private High School, sporting a ninja-inspired ensemble complete with a black face mask, bandana adorned with a metal plate, fingerless gloves, and a scarf. His name echoes the historical term *shinobi no mono*, reflecting his stealth-oriented persona and skills. He shares camaraderie with classmates Chiarai Shigeo and Sonoda Taisei, frequently indulging in playful banter about social dynamics—including assessing romantic prospects within their peer group. Though quietly observant and reserved, he occasionally joins collective efforts like the "Komi Bodyguards," an initiative to assist a classmate, though he prefers to operate from the shadows. Renowned for his agility, Mono executes gravity-defying leaps and showcases pinpoint precision, such as threading a compass through a narrow gap or landing a shuriken inches from its target—traits cementing his reputation as the school’s resident ninja. A fleeting yet memorable incident during a class game leaves him briefly startled by an unexpected cheek kiss, though it scarcely disrupts his routine or relationships. His background remains shrouded in mystery, offering little insight into family history or personal drives beyond his ninja-inspired identity. His role stays largely unchanged across official narratives, serving as a consistent presence within class interactions without undergoing major arcs or evolution. Confined to his role in the main series, he has yet to appear in spin-offs, films, or OVAs.