Nightwalker: The Midnight Detective

Shido Tatsuhiko is a private investigator with a unique condition: he's a vampire with no memory of his past. He teams up with Yayoi Matsunaga, a government agent, and Riho Yamazaki, a teenage girl who works as his assistant. Their unlikely group is completed by Guni, a small supernatural being. They deal with Nightbreed, demonic creatures that threaten their city, while also being pursued by Cain, the vampire who created Shido.