The Case Book of Arne anime unveiled a new trailer, which features the main cast and a January 6, 2026, premiere date. The series also revealed the opening and ending theme songs: Sou performs the opening theme song “Q.E.D.” and Watashi Kobayashi performs the ending theme song “Ningyo no Machi.”
The main cast consists of:
- Mariya Ise as Luis Hartman
- Koki Uchiyama as Arne Neuntöte
- Aimi Tanaka as Arne Neuntöte (young)
- Yuka Nukui as Lynn Reinweiss
A teaser trailer was released last August. Studio SILVER LINK is animating, with the following main staff:
- Director: Keisuke Inoue
- Series Composition: Murasaki, Keisuke Inoue
- Character Design & Chief Animation Production: Akiko Sato, Harutaro (original designs)
- Music: Yoshiaki Fujisawa
The anime is based on a game by Harumurasaki (Murasaki), with character designs by Harutaro. Murasaki is also supervising the script for the anime, while the game’s original illustrator, Harutaro, designed the characters for the anime.
Steam describes the game:
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.
Source: The Case Book of Arne Official Website, X (formerly Twitter)
©Harumurasaki/Vaka, Inc. ©Harumurasaki/Vaka/Arne Detective Agency
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