Tō Handa, a dhampir born to a vampire mother and human father, serves as an investigator in the Kanagawa Prefectural Police’s Anti-Vampire Division. He works alongside colleagues to resolve supernatural cases that frequently intersect with the protagonist’s activities.

Once the protagonist’s high school classmate, Handa’s actions are fueled by his mother’s admiration for the protagonist’s published works, igniting a fierce rivalry. Determined to tarnish the protagonist’s reputation, he fixates on exposing perceived weaknesses, his private quarters cluttered with relics of their one-sided competition.

He forges alliances rooted in schadenfreude, most notably bonding with a vampire who shares his penchant for antagonizing the protagonist. While his police duties often entangle with personal vendettas, the division’s operational protocols remain unspecified in existing records.

Handa’s strained family dynamic centers on his mother’s unwavering fandom, which intensifies his competitive drive. Beyond the main series, his character arc remains unexplored in supplementary media.