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The Case Book of Arne

7.0

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…

Production

Production

Trailers & Videos

Thumbnail for video: Official Trailer [Subtitled]

Official Trailer [Subtitled]

Seasons

12 Episodes • Premiered 2026

Still image for The Case Book of Arne season 1 episode 1: Those Who Dig Pits for Others Will Fall In Themselves

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

7.0

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

Still image for The Case Book of Arne season 1 episode 2: There Is Always Sunshine After the Rain

2. There Is Always Sunshine After the Rain

6.0

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

Still image for The Case Book of Arne season 1 episode 3: Misfortune Never Visits Alone

3. Misfortune Never Visits Alone

6.5

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

Still image for The Case Book of Arne season 1 episode 4: Those Who Never Gamble Never Win

4. Those Who Never Gamble Never Win

5.0

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

Still image for The Case Book of Arne season 1 episode 5: Episode 5

5. Episode 5

Still image for The Case Book of Arne season 1 episode 6: Episode 6

6. Episode 6

Still image for The Case Book of Arne season 1 episode 7: Episode 7

7. Episode 7

Still image for The Case Book of Arne season 1 episode 8: Episode 8

8. Episode 8

Still image for The Case Book of Arne season 1 episode 9: Episode 9

9. Episode 9

Still image for The Case Book of Arne season 1 episode 10: Episode 10

10. Episode 10

Still image for The Case Book of Arne season 1 episode 11: Episode 11

11. Episode 11

Still image for The Case Book of Arne season 1 episode 12: Episode 12

12. Episode 12

Cast

Photo of Mariya Ise

Mariya Ise

Louis Hartmann (voice)

Photo of Koki Uchiyama

Koki Uchiyama

Arne Neuntöte (voice)

Photo of Aimi Tanaka

Aimi Tanaka

Young Arne Neuntöte (voice)

Photo of Yuka Nukui

Yuka Nukui

Lynn Reinweiß (voice)

Photo of Yuki Sakakihara

Yuki Sakakihara

Zisye (voice)

Photo of Yuuki Shin

Yuuki Shin

Nachzehrer (voice)

Photo of Yoko Hikasa

Yoko Hikasa

Amy (voice)

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