A vampire and a girl... who are they?　The two of them have a secret and solve a strange case... In a world where paranormal activity takes place, "Player" solves a case in which a non-human becomes a suspect.

Arne Neuntöte is a vampire detective who manipulates the power of xenomorphs.
Lynn Reinweiß is a nobleman’s daughter who loves vampires.

They live in a world that will never cross over, 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 "Rügenberg", where the deformed inhabitants live.

A girl'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 red moon.”

The game is divided into "Problem" and "Solve" episodes. In Japan, the "Solve" episode was preceded by a massive "Guess Who" session, in which over 1,000 people participated.

Use the clues that appear throughout the “Problem” episode to solve the crime in this orthodox detective mystery. This release brings you the first case “The Reinweiß Murder” and the Interlude “The Monster Festival”.

Solving the mystery with "special rules" involving zombies, vampires, and other monsters has been highly praised by experts in authentic mystery.

The Case Book of Arne is coming to PC (Steam) on October 29, 2020 for $9.99.