A well-built man with angular glasses, Kuzuki serves as the strict homeroom teacher for Rin's class. His primary subjects include World History and Ethics. Respected by both colleagues and students, Kuzuki is known for his stern and distant demeanor.
Unbeknownst to many, he is a serial killer who allies himself with Caster, functioning more as her servant than an equal partner. Secretly in love with Caster, he conceals his feelings entirely. When she lay dying after their defeat by the protagonists, Kuzuki spared her from the truth, instead telling her they had achieved victory. Holding her until her last breath, he then perished shortly thereafter.
