Night Walker: Mayonaka no Tantei
English name: Nightwalker: The Midnight Detective
Genres: Action, Horror, Mystery
Type: TV, Episodes: 12
Aired: Jul 9, 1998 to Sep 23, 1998
Studio: AIC
Source: Visual novel
Rating: R+ - Mild Nudity
Synopsis:
Shido Tatsuhiko is not only a private eye... he is also a vampire with no real memory of his past. Joined by Yayoi Matsunaga, a female government agent, Riho Yamazaki, an orphaned teenage girl working as his girl Friday and Guni, a little green imp, Shido must face demonic creatures known as Nightbreed. Meanwhile, Cain, the vampire who made him what he is now, is seeking him...

(Source: ANN)