A mysterious being living within the mirror who calls himself the “Lying Wolf Boy.” While usually cooperative with [Arne](https://anilist.co/character/378163/Arne-Neuntte) and possessing excellent information-gathering skills, he may withhold information if it seems interesting, deliberately complicate cases, or even become hostile.

Arne Neuntöte is a vampire detective who manipulates supernatural powers. Lynn Reinweiß is a nobleman’s daughter who loves vampires. Their worlds should never have crossed, but they join hands to solve a bloody mystery. 

In the darkest of nights, Lynn finds herself in desperate need of help. Then she wanders into the mysterious city of "Lügenberg", where non-humans live. Lynn's world changes drastically when she encounters "Arne", a vampire who is called "the worst" in the city. And tonight, a new "murder case" has occurred. What is the truth behind the bizarre incidents that take place in a world where humanity and the bizarre intersect?
 
"Come on, human. You may dance merrily under the crimson moon.” 
(Source: The Case Book of Arne Steam page)

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