TV Series · 2026

The Case Book of Arne

Mystery, Animation · Ended

Composite

2.8

IMDb

— / 10

No votes

TMDB

6.5 / 10

8 votes

Local

— / 10

No votes

Synopsis

Louis Hartmann loses his father, a private detective investigating a string of murders, leaving him all alone. Rumor has it that the murders are the work of a Grave-Digger Vampire. Louis isn’t keen on superstitions and vows to catch the culprit himself. That is, until a self-proclaimed detective, Arne Neuntöte, and his assistant, Lynn Reinweiß, appear. A new door is about to open for Louis…

Trailer

Streaming availability

flatrate

Crunchyroll

Crunchyroll Amazon Channel

Streaming data provided by JustWatch.

Cast

Mariya Ise

Louis Hartmann (voice)

Koki Uchiyama

Arne Neuntöte (voice)

Aimi Tanaka

Young Arne Neuntöte (voice)

Yuka Nukui

Lynn Reinweiß (voice)

Yuki Sakakihara

Zisye (voice)

Yuuki Shin

Nachzehrer (voice)

Yoko Hikasa

Amy (voice)

Crew

Art

Shoko Naoki Prop Designer
Tetsuhiro Shimizu Art Direction
Tetsuhiro Shimizu Art Designer

Camera

Sayumi Yamada Director of Photography

Directing

Keisuke Inoue Series Director

Editing

Katsuhiro Kimura Editor

Production

Mayo Arita Producer
Ayaka Sugiura Producer
Yuito Hirahara Producer
Emi Kashimura Producer
Aya Iizuka Producer
Kota Arai Producer
Hotate Inaba Producer
Kaya Igarashi Producer
Yuudai Miyagi Associate Producer
Ryo Ebina Associate Producer

Sound

Kohei Yoshida Sound Director
Takuya Hasegawa Sound Effects
Yoshiaki Fujisawa Original Music Composer
Yutaka Suwa Music Producer
Naomi Fujita Sound Mixer

Visual Effects

Harutaro Character Designer
Akiko Sato Character Designer
Akiko Sato Supervising Animation Director
Yuri Miyoshi Character Designer
Natsumi Hirama Color Designer
Yuki Kuribayashi 3D Director
Susumu Kashiwabara 2D Artist
Yuko Shintani 2D Artist

Writing

Keisuke Inoue Series Composition
Murasaki Series Composition

Seasons & episodes

Season 1 (12 ep)

1. Those Who Dig Pits for Others Will Fall In Themselves

Jan 7, 2026 · 23 min

Louis Hartmann joins forces with the members of the Arne Detective Agency to investigate his father's murder.
2. There Is Always Sunshine After the Rain

Jan 14, 2026 · 22 min

Lynn remembers the time she first met Arne and hired him to help investigate her father's suspicious behavior.
3. Misfortune Never Visits Alone

Jan 21, 2026 · 23 min

Arne makes a shocking discovery about Lynn's father and Gordon reveals the dark truth of the Reinweiß mansion.
4. Those Who Never Gamble Never Win

Jan 28, 2026 · 22 min

Lynn and Arne are both troubled by surprise encounters that threaten to alter the course of the investigation.
5. One Swallow Does Not a Summer Make!

Feb 4, 2026 · 22 min

Lynn and Arne assemble the servants to review the clues and sniff out the killers through deductive reasoning.
6. Time Will Tell

Feb 11, 2026 · 22 min

A distraught mermaid arrives at the detective agency searching for the reason why her lover tried to kill her.
7. Eating Whets the Appetite

Feb 18, 2026 · 22 min

Arne tracks down a jewel thief while Lynn investigates a series of disappearances connected to an art museum.
8. Desire and Love Make All Burdens Lighter

Feb 25, 2026 · 22 min

Lynn and Arne trace the mysteries of the missing men and lost piece of jewelry to their shocking conclusions.
9. Not All That Glitters Is Gold

Mar 4, 2026 · 22 min

Arne and Lynn are asked to investigate a man who appears to have started cheating on his wife after an injury.
10. Different Countries, Different Customs

Mar 11, 2026 · 22 min

Arne decides to investigate a locked-room murder on a whim and soon realizes that it may not be what it seems.
11. Birds of a Feather Flock Together

Mar 18, 2026 · 22 min

Arne uncovers a disturbing connection between all five of the cases investigated by the Arne Detective Agency.
12. All's Well That Ends Well

Mar 25, 2026 · 22 min

Lynn and friends battle their way through Dracula's soldiers as they race to rescue Arne before it's too late.