Kazuki Oogami is the adoptive older brother and legal guardian of Souma Oogami, overseeing his care following Souma’s integration into the Oogami family. As guardian of the Temple of the Sun and Moon, he instructs the solar and lunar priestesses, Himeko Kurusugawa and Chikane Himemiya, clarifying their ordained roles and directing their efforts to thwart the primordial deity Yamata no Orochi. His calm, collected disposition and unwavering self-control establish him as a grounding influence, providing stability to those he guides. Through interactions with the priestesses and Souma, he fulfills his duties as both mentor and protector, prioritizing their preparedness and safety in their shared mission.