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87% positive of 339 · Very Positive · Live from Steam
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A vampire and a girl... who are they? The two of them have a secret and solve a strange case... In a world where paranormal activity takes place, "Player" solves a case in which a non-human becomes a suspect. Such a "detective adventure" is coming to STEAM.
Live data from Steam, tracked by SteamPlayerBase.
What changed on Steam for this game since we started following it: prices and sales, builds, name, release date and review score.
Review score: 86% on 2026-11-01 → 87% today (339 reviews)
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1 item on Steam, newest first.

Every build released on Steam for this game since we started tracking it, with the developer's patch notes. Updated within minutes of each new build.
Happy New Year! On the official FANBOX of "The Case Book of Arne," we have released a new New Year's illustration newly drawn by Harutaro-sensei. In addition, a message from the two Harumurasaki and a glimpse image of the new work are also posted. Please take …
▼Basic pack "The Case Book of Arne" is a mystery ADV in which Lynn, the daughter of a nobleman who longs to become a vampire, and Arne, a legendary vampire, take on a series of mysterious cases. The DLC depicting the interval is also discounted now only! ★★★★ …
▼Basic pack https://store.steampowered.com/app/1322290/ Period: 3/14 2:00 - 3/21 2:00(JST) "The Case Book of Arne" is a mystery ADV in which Lynn, the daughter of a nobleman who longs to become a vampire, and Arne, a legendary vampire, take on a series of myst…
Dear fans, The latest entry in The Case Book of Arne, Teil 4, is now available as DLC. It's priced at 2.99 USD. See you at the festival! https://store.steampowered.com/app/1550440/ https://store.steampowered.com/app/1322290/ Vaka Game Magazine / PLAYISM Vaka G…
Dear fans, The Case Book of Arne Teil 4 "Interlude," the epilogue to Case 1 comes to Steam as a $2.99 DLC! Lynn struggles to acclimate to living with Arne. A festival for monsters beckons to her-- plenty of fun minigames, fortunes, and a moving development!
A vampire king solves murder mysteries Sherlock Holmes-style! This long-awaited full-on mystery-adventure game is finally being released worldwide! The Case Book of Arne is now available on Steam! Dear fans, The Case Book of Arne: Case 1 (Teil.1~Teil.3), featu…
Dear fans, News Flash: The Case Book of Arne The date for the global release of The Case Book of Arne has been set for October 29th! Supported languages will be English, Japanese and Simplified Chinese. We hope players from around the world will enjoy this det…
Dear fans, “The Case Book of Arne", a popular game from Game magazine, will be released on Steam this fall. Japanese, English and Simplified Chinese versions of the game are planned for release. ”Arne's Case Files" is a full-fledged mystery game in the traditi…
Dear fans, We released Angels of Death Episode Eddie and Noel The Mortal Fate Season 9 today but at the same time we also revealed store pages for two other Game Magazine titles! Tsugunohi and The Case Book of Arne. Please add them to your wishlists! https://s…