|Affiliation||Hokkaido Police Security Department, Special Public Safety Division 2|
|Hometown||ONLO Orphanage, Hokkaido|
|Manga Debut||Line 2; Safe House|
Tadaya Hiruta (蛭田 唯矢, Hiruta Tadaya?) is a childhood friend of Yuuki Anzai and Yuuko Tamaru since they were raised at the same ONLO orphanage. Unlike Yuuki, he continues to live in Hokkaido and works on the police force there.
Tadaya has short, messy light-colored spiked hair and quite sharp eyes with small pupils. He also has dark circles under his eyes due to being a non-blood-drinking devil.
- The name Tadaya means "solely, only, merely, simply" (唯) (tada) and "arrow" (矢) (ya).
- Tadaya's surname Hiruta means "leech" (蛭) (hiru) and "field, rice paddy" (田) (ta).