Sagyō operates as a junior officer in the Vampire Countermeasure Division of Kanagawa Police, reporting directly to Vice Captain Hinaichi and Senior Officer Tō Handa. He initially admired Handa, but after uncovering Handa’s true nature, only 10% of that respect remains. Physically, he sports short green hair and black eyes, always clad in the division’s uniform: white shirt, green tie, black slacks, and black shoes. Sagyō considers himself the team’s most rational member yet grows increasingly vulnerable to eccentric influences—particularly Handa’s—which fuels his personal frustration. His interests include an intense passion for popping bubble wrap, reacting vehemently to its waste or toys mimicking endless popping. Exposure to Ydan Ojisan’s Y-beam also revealed his attraction to mature women with specific physical traits. As a sniper, Sagyō displays extraordinary skill, never missing a target regardless of distance or speed, though he remains oblivious to this prowess. A pivotal shift occurred during Handa’s mandatory infiltration of Ronaldo’s residence, where Sagyō encountered and adopted a vampiric burdock root, naming it "Burdy." Trivia notes he shares his sister’s exact height.