S01E0123:051. Those Who Dig Pits for Others Will Fall In ThemselvesLouis Hartmann joins forces with the members of the Arne Detective Agency to investigate his father's murder.Episodes — Season 1
Season pageS01E0123:051. Those Who Dig Pits for Others Will Fall In ThemselvesLouis Hartmann joins forces with the members of the Arne Detective Agency to investigate his father's murder.
S01E0222:312. There Is Always Sunshine After the RainLynn remembers the time she first met Arne and hired him to help investigate her father's suspicious behavior.
S01E0323:133. Misfortune Never Visits AloneArne makes a shocking discovery about Lynn's father and Gordon reveals the dark truth of the Reinweiß mansion.
S01E0422:344. Those Who Never Gamble Never WinLynn and Arne are both troubled by surprise encounters that threaten to alter the course of the investigation.
S01E0522:045. 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.
S01E0622:306. Time Will TellA distraught mermaid arrives at the detective agency searching for the reason why her lover tried to kill her.
S01E0722:447. Eating Whets the AppetiteArne tracks down a jewel thief while Lynn investigates a series of disappearances connected to an art museum.
S01E0822:538. Desire and Love Make All Burdens LighterLynn and Arne trace the mysteries of the missing men and lost piece of jewelry to their shocking conclusions.
S01E0922:519. Not All That Glitters Is GoldArne and Lynn are asked to investigate a man who appears to have started cheating on his wife after an injury.
S01E1022:4510. Different Countries, Different CustomsArne decides to investigate a locked-room murder on a whim and soon realizes that it may not be what it seems.
S01E1122:3511. Birds of a Feather Flock TogetherArne uncovers a disturbing connection between all five of the cases investigated by the Arne Detective Agency.
S01E1222:3312. All's Well That Ends WellLynn and friends battle their way through Dracula's soldiers as they race to rescue Arne before it's too late.Where to stream The Case Book of Arne
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Availability provided by JustWatch via TMDB, details on TMDB. Offers in the United States, subject to change.
The Case Book of Arne 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…
The Case Book of Arne cast
The Case Book of Arne trailer
About the series The Case Book of Arne
The Case Book of Arne is a series (animation and mystery), airing on Nippon TV since 2026. It has 1 season and 12 episodes. The series ended on March 25, 2026. Cast members include Mariya Ise, Koki Uchiyama and Aimi Tanaka. It is rated 6.5/10 by 8 TMDB users.
Frequently asked questions about The Case Book of Arne
Where to watch The Case Book of Arne online?
In the United States, The Case Book of Arne is available with a subscription on Crunchyroll and Crunchyroll Amazon Channel (source: JustWatch via TMDB, offers subject to change). Each episode has its own page with this information.
How many seasons of The Case Book of Arne are there?
The Case Book of Arne has 1 season for a total of 12 episodes.
Has The Case Book of Arne ended?
Yes, the series has ended: the last episode aired on March 25, 2026.
Who stars in The Case Book of Arne?
The lead actors are 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)).
