The Case Book of Arne Drops Main Trailer and Key Visual - A main trailer and main key visual have been released for the upcoming The Case Book of Arne TV anime adaptation. The Case Book of Arne is inspired by a 2D mystery-adventure game created by Harumurasaki, The new promotional materials were accompanied by the reveal of the show’s January 6, 2026 JST broadcast premiere (effectively January 7 at 1:29 AM JST), as well as main cast and theme song details:
• Mariya Ise is original character Lewis Hartman, who runs a detective agency with their father
• Koki Uchiyama is the vampire detective Arne
• Aimi Tanaka is boy form Arne
• Yuka Nukui is Lynn, the daughter of a noble family
• The opening song is Sou‘s “Q.E.D”
• The ending song is Watashi Kobayashi‘s “Ningyo no Machi”
The game first debuted in 2017 on the Game Magazine website (Game Magazine is also credited as a developer) with a serialized format before its 2020 Steam release. A KADOKAWA-published The Case Book of Arne manga drawn by Soraho Ina also exists.
Synopsis
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?
