Series · 2026 · Animation
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…
1 season · 12 episodes

Episode 01
Those Who Dig Pits for Others Will Fall In Themselves
Louis Hartmann joins forces with the members of the Arne Detective Agency to investigate his father's murder.

Episode 02
There Is Always Sunshine After the Rain
Lynn remembers the time she first met Arne and hired him to help investigate her father's suspicious behavior.

Episode 03
Misfortune Never Visits Alone
Arne makes a shocking discovery about Lynn's father and Gordon reveals the dark truth of the Reinweiß mansion.

Episode 04
Those Who Never Gamble Never Win
Lynn and Arne are both troubled by surprise encounters that threaten to alter the course of the investigation.

Episode 05
One Swallow Does Not a Summer Make!
Lynn and Arne assemble the servants to review the clues and sniff out the killers through deductive reasoning.

Episode 06
Time Will Tell
A distraught mermaid arrives at the detective agency searching for the reason why her lover tried to kill her.

Episode 07
Eating Whets the Appetite
Arne tracks down a jewel thief while Lynn investigates a series of disappearances connected to an art museum.

Episode 08
Desire and Love Make All Burdens Lighter
Lynn and Arne trace the mysteries of the missing men and lost piece of jewelry to their shocking conclusions.

Episode 09
Not All That Glitters Is Gold
Arne and Lynn are asked to investigate a man who appears to have started cheating on his wife after an injury.

Episode 10
Different Countries, Different Customs
Arne decides to investigate a locked-room murder on a whim and soon realizes that it may not be what it seems.

Episode 11
Birds of a Feather Flock Together
Arne uncovers a disturbing connection between all five of the cases investigated by the Arne Detective Agency.

Episode 12
All's Well That Ends Well
Lynn and friends battle their way through Dracula's soldiers as they race to rescue Arne before it's too late.
based on 8 votes
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…
7 principal cast
The Case Book of Arne is available to stream on Flicksy via 6 verified sources, aggregated from publicly available embed providers. The animation has 1 season and 12 total episodes, rated 6.5/10 by 8 viewers.
The Case Book of Arne has 1 season with 12 episodes in total.
The Case Book of Arne has ended and is no longer in production.
The Case Book of Arne airs on Nippon TV.
The Case Book of Arne first aired on January 7, 2026.
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