Mariya Ise
Louis Hartmann (voice)
Series
Watch The Case Book of Arne (2026) Online
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…
Episodes
Season 1
PreviousNext
1. Those Who Dig Pits for Others Will Fall In ThemselvesNow viewing2026-01-0723m7.0Louis Hartmann joins forces with the members of the Arne Detective Agency to investigate his father's murder.
2. There Is Always Sunshine After the Rain2026-01-1422m6.0Lynn remembers the time she first met Arne and hired him to help investigate her father's suspicious behavior.
3. Misfortune Never Visits Alone2026-01-2123m6.5Arne makes a shocking discovery about Lynn's father and Gordon reveals the dark truth of the Reinweiß mansion.
4. Those Who Never Gamble Never Win2026-01-2822m5.0Lynn 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!2026-02-0422m4.0Lynn and Arne assemble the servants to review the clues and sniff out the killers through deductive reasoning.
6. Time Will Tell2026-02-1122m4.0A distraught mermaid arrives at the detective agency searching for the reason why her lover tried to kill her.
7. Eating Whets the Appetite2026-02-1822m3.5Arne tracks down a jewel thief while Lynn investigates a series of disappearances connected to an art museum.
8. Desire and Love Make All Burdens Lighter2026-02-2522m5.0Lynn and Arne trace the mysteries of the missing men and lost piece of jewelry to their shocking conclusions.
9. Not All That Glitters Is Gold2026-03-0422m6.0Arne and Lynn are asked to investigate a man who appears to have started cheating on his wife after an injury.
10. Different Countries, Different Customs2026-03-1122m5.0Arne 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 Together2026-03-1822m6.0Arne uncovers a disturbing connection between all five of the cases investigated by the Arne Detective Agency.
12. All's Well That Ends Well2026-03-2522m6.0Lynn and friends battle their way through Dracula's soldiers as they race to rescue Arne before it's too late.
Cast
Top Billed Cast
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)
Availability
Where To Watch Legally
Crunchyroll
Crunchyroll Amazon ChannelStreaming availability data provided by JustWatch.
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FAQ
Frequently Asked Questions
Is The Case Book of Arne available to watch online?
Yes - see the "Where to watch legally" section on this page for streaming, rental and purchase options.
How many seasons does The Case Book of Arne have?
The Case Book of Arne has 1 season and 12 episodes.
When did The Case Book of Arne first air?
The Case Book of Arne first aired in 2026.
Is The Case Book of Arne still running?
The Case Book of Arne's status on TMDB is: Ended.
What genre is The Case Book of Arne?
The Case Book of Arne is classified as Animation, Mystery.