The anime is set to premiere on 7 January, 2026.
First announced in August 2025, the anime adaptation of the 2017 adventure-mystery RPG “The Case Book of Arne” has unveiled major updates, including a premiere schedule for 7 January 2026.
Main visual:
First promotional visual:
“The Case Book of Arne” cast, staff, and other information
The main cast for the anime are:
- Yuka Nukui as Lynn Reinweiß
- Kouki Uchiyama as Arne Neuntöte
- Mariya Ise as Louis Hartmann
The anime adaptation is being helmed by director Keisuke Inoue at production studio SILVER LINK. Inoue is known for directing “My Next Life as a Villainess: All Routes Lead to Doom!”, “Keep Your Hands Off Eizouken!”, and “Masamune-kun’s Revenge”. Inoue is also working on the series composition alongside the original game’s developer, Harumurasaki.
Akiko Sato handles character design and is the chief animation director, while Yoshimasa Fujisawa is handling music.
The rest of the staff are:
- Script: Aya Matsui, Akira Nishikubo, Hitomi Ogawa
- Sub-character design: Yuri Miyoshi
- Art director, Background art: Tetsuhiro Shimizu
- Color design: Natsumi Hirama
- Prop design: Shouko Naoki
- 3D director: Yuki Kuribayashi
- 2DCG: Yuuko Shintani
- Director of photography: Sayumi Yamada
- Editing: Katsuhiro Kimura
- Sound director: Kouhei Yoshida
- Sound effects: Takuya Hasegawa
The anime adapts the 2017 mystery-adventure RPG “The Case Book of Arne”, which was initially released as a freeware in Vaka Game Magazine. The game is also available on Steam in English, Japanese, and Chinese.
The game received a shoujo manga adaptation with illustrations by Soraho Ina from November 2018 to March 2022. It was published through Media Factory’s “Monthly comic Gene”, and was collected into four tankobon volumes.
The official Steam page of the game describes the story as:
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?