[Machine Translation] Mysteries, riddles, and mysteries outside the norm that could not possibly happen in the world of man. Arne Nointer, the king of vampires who once ruled over mankind. After a mortal struggle with humans, he loses most of his power and runs a detective agency with a human named Rin, a "vampire geek" in a city of outsiders. The requests they receive include a corpse with a large hole in its neck, and a murder in which two people with the same face were seen at the same time.... Arne and Lynn take on strange cases that arise in a world where people and foreigners live together and different abilities exist in everyday life! This is a unique mystery.