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The Case Book of Arne
RELEASED·SERIES·JA

The Case Book of Arne

Wed, Jan 7, 2026
  • Animation
  • Mystery
Series · Synopsis

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

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Where to watch

Streaming on

  • Crunchyroll↗
  • Crunchyroll Amazon Channel↗
Cast

Top of the call sheet

  • Mariya Ise
    Mariya Ise
    as Louis Hartmann (voice)
  • Koki Uchiyama
    Koki Uchiyama
    as Arne Neuntöte (voice)
  • Aimi Tanaka
    Aimi Tanaka
    as Young Arne Neuntöte (voice)
  • Yuka Nukui
    Yuka Nukui
    as Lynn Reinweiß (voice)
  • Yuki Sakakihara
    Yuki Sakakihara
    as Zisye (voice)
  • Yuuki Shin
    Yuuki Shin
    as Nachzehrer (voice)
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Episodes

1 season · 12 episodes

Running · 12 aired
Season 1
12 episodes · 12 aired
▾
  • E1
    Those Who Dig Pits for Others Will Fall in Themselves
    Aired · Tue, Jan 6, 2026 · 30m

    Louis Hartmann joins forces with the members of the Arne Detective Agency to investigate his father's murder.

  • E2
    There Is Always Sunshine after the Rain
    Aired · Tue, Jan 13, 2026 · 23m

    Lynn remembers the time she first met Arne and hired him to help investigate her father's suspicious behavior.

  • E3
    Misfortune Never Visits Alone
    Aired · Tue, Jan 20, 2026 · 23m

    Arne makes a shocking discovery about Lynn's father and Gordon reveals the dark truth of the Reinweiß mansion.

  • E4
    Those Who Never Gamble Never Win
    Aired · Tue, Jan 27, 2026 · 23m

    Lynn and Arne are both troubled by surprise encounters that threaten to alter the course of the investigation.

  • E5
    One Swallow Does Not a Summer Make!
    Aired · Tue, Feb 3, 2026 · 23m

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

  • E6
    Time Will Tell
    Aired · Tue, Feb 10, 2026 · 23m

    Louis Hartmann loses his father and vows to catch the culprit himself. That is, until Arne and Lynn appear...

  • E7
    Eating Whets the Appetite
    Aired · Tue, Feb 17, 2026 · 23m

    Arne tracks down a jewel thief while Lynn investigates a series of disappearances connected to an art museum.

  • E8
    Desire and Love Make All Burdens Lighter
    Aired · Tue, Feb 24, 2026 · 23m

    Lynn and Arne trace the mysteries of the missing men and lost piece of jewelry to their shocking conclusions.

  • E9
    Not All That Glitters Is Gold
    Aired · Tue, Mar 3, 2026 · 23m

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

  • E10
    Different Countries, Different Customs
    Aired · Tue, Mar 10, 2026 · 23m

    Arne decides to investigate a locked-room murder on a whim and soon realizes that it may not be what it seems.

  • E11
    Birds of a Feather Flock Together
    Aired · Tue, Mar 17, 2026 · 23m

    Arne uncovers a disturbing connection between all five of the cases investigated by the Arne Detective Agency.

  • E12
    All's Well That Ends Well
    Aired · Tue, Mar 24, 2026 · 23m

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