The Case Book of Arne

A detective adventure where supernatural rules shape a murder mystery

HARUMURASAKI · Published by Vaka Game Magazine · Released Oct 28, 2020

As of Oct 28, 2026: -45% right now, $5.49

Reviews: Very Positive; 87% of 357
Recent reviews: Not enough recent
Players: 0; daily peak, Oct 28, 2026
Steam Deck: Untested
Last update on Steam: 3 years ago; Jan 2, 2023
Minimum PC: Open GL compliant; 2 GB RAM · 1 GB disk; Full requirements

What is The Case Book of Arne?

This 2D detective adventure follows vampire Arne and nobleman's daughter Lynn as they investigate a murder in a world shared by humans and monsters. You use clues introduced in the "Problem" episodes to solve the case in the "Solve" episodes.

For you if...

+you like mysteries that mix horror with humor

Not for you if...

−you prefer exploration over long stretches of reading

What players say

87% of 357 reviews are positive

Players praise the characters, artwork, and plot twists. Some ask for an English translation of the next case.

Screenshots and trailer

The Case Book of Arne system requirements

Minimum: Open GL compliant, 2 GB RAM, 1 GB of disk space.

As published by the developer.

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Minimum

OS: Windows 10
Processor: Intel Core2 Duo or higher
Graphics: Open GL compliant video card
Memory: 2 GB RAM
Storage: 1 GB available space

Does The Case Book of Arne have co-op or multiplayer?

No: single-player only, no multiplayer modes declared.

Single-player

Does The Case Book of Arne run on Steam Deck?

Untested Not yet tested by Valve on Steam Deck.

PC version details

DRM: None declared on Steam
Controller: Keyboard and mouse
Platforms: Windows
Steam features: Family Sharing
Languages: Text only: English, Japanese, Simplified Chinese.

Does The Case Book of Arne use AI-generated content?

No AI-generated content is disclosed on the game's Steam page.

Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Oct 27, 2026. How to filter AI games on Steam