Night Walker: Mayonaka no Tantei

Behind Shido Tatsuhiko's private detective agency lies a secret: its owner is a vampire who protects humans from demons that possess their bodies. With government investigator Yayoi and his young assistant Riho close at hand, he follows crimes whose true perpetrators ordinary police cannot see.

Shido's work is also an attempt to escape the cruelty of his own past. When the vampire Cain returns to claim him, the distance between hunter and monster narrows, threatening the human connections that give his present life meaning.