The Game Census
The Case Book of Arne cover art

The Case Book of Arne

HARUMURASAKI · Vaka Game Magazine · 2020-10-28

Steam

AdventureIndieRPG

Modes: Single player

Releases: Oct 29, 2020 (PC (Microsoft Windows))

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.

3
playing now
88%
positive of 369 reviews
Very Positive
steam rating
20,000–50,000
owners (SteamSpy est.)
platinum
deck/linux tier (ProtonDB)
$5.99
steam price (US)

3 players in-game as of 2026-08-30 12:00 UTC (census sample)

The Case Book of Arne is a Japanese Gothic horror mystery adventure game by Harumurasaki (Murasaki), with character designs by Harutarō. It was created using RPG Maker and was originally released as freeware via the Vaka Game Magazine website in November 2017. It is also available on Steam in Japanese, Chinese, and English. A manga adaptation with art by Soraho Ina was serialized in Media Factory's shōjo manga magazine Monthly Comic Gene from November 2018 to March 2022 and was collected in four tankōbon volumes. An anime television series adaptation produced by Silver Link aired from January to March 2026.

Health check

Insufficient data
  • · Not enough review history collected yet to judge health.
  • · Top 45% of 11,424 Adventure games in the census by review count.
Estimated sales: 7.4k–17k copies

Review-multiple estimate from 369 total reviews — how this is computed.

All-time low: $4.99 at Steam (2022-10-25)via IsThereAnyDeal

12-month high $9.99 · on sale 7 of 13 observed days (census price snapshots)

Players online

302026-08-12 04:00 — 0 players2026-08-12 20:00 — 0 players2026-08-13 12:00 — 0 players2026-08-14 03:00 — 0 players2026-08-14 19:00 — 0 players2026-08-15 11:00 — 0 players2026-08-16 03:00 — 0 players2026-08-16 19:00 — 0 players2026-08-17 11:00 — 0 players2026-08-18 03:00 — 1 players2026-08-18 18:00 — 1 players2026-08-19 10:00 — 3 players2026-08-20 02:00 — 0 players2026-08-20 18:00 — 0 players2026-08-21 10:00 — 0 players2026-08-22 01:00 — 0 players2026-08-22 17:00 — 2 players2026-08-23 09:00 — 0 players2026-08-24 01:00 — 0 players2026-08-24 17:00 — 1 players2026-08-25 08:00 — 1 players2026-08-26 01:00 — 1 players2026-08-26 16:00 — 1 players2026-08-27 09:00 — 1 players2026-08-27 20:00 — 0 players2026-08-28 12:00 — 0 players2026-08-29 04:00 — 0 players2026-08-29 20:00 — 0 players2026-08-30 12:00 — 3 players
Concurrent players, hourly average, last 30 days (census samples).

Price history

$9.99$4.992020-10-292026-08-162020-10-29 — best price $8.992021-01-05 — best price $9.992021-03-01 — best price $7.992021-05-06 — best price $9.992021-06-05 — best price $7.992021-07-08 — best price $9.992021-09-27 — best price $7.992021-11-01 — best price $9.992021-12-23 — best price $7.992022-02-03 — best price $9.992022-05-21 — best price $7.992022-07-07 — best price $9.992022-10-25 — best price $4.992022-11-29 — best price $9.992023-02-13 — best price $4.992023-03-23 — best price $9.992023-06-30 — best price $4.992023-11-02 — best price $9.992023-12-22 — best price $4.992024-02-19 — best price $9.992024-06-27 — best price $4.992024-09-22 — best price $9.992024-11-27 — best price $4.992025-01-02 — best price $9.992025-03-13 — best price $4.992025-06-02 — best price $9.992025-10-01 — best price $4.992025-11-03 — best price $9.992026-01-12 — best price $5.992026-03-26 — best price $9.992026-08-16 — best price $5.99
Lowest recorded price across tracked stores, per day (census snapshots).

Attention

260282026-05-30 — 36 pageviews2026-06-02 — 100 pageviews2026-06-05 — 83 pageviews2026-06-08 — 49 pageviews2026-06-11 — 53 pageviews2026-06-14 — 260 pageviews2026-06-17 — 45 pageviews2026-06-20 — 53 pageviews2026-06-23 — 95 pageviews2026-06-26 — 51 pageviews2026-06-29 — 62 pageviews2026-07-02 — 55 pageviews2026-07-05 — 53 pageviews2026-07-08 — 59 pageviews2026-07-11 — 59 pageviews2026-07-14 — 70 pageviews2026-07-17 — 81 pageviews2026-07-20 — 72 pageviews2026-07-23 — 56 pageviews2026-07-26 — 39 pageviews2026-07-29 — 35 pageviews2026-08-01 — 34 pageviews2026-08-04 — 46 pageviews2026-08-07 — 28 pageviews2026-08-10 — 51 pageviews2026-08-13 — 42 pageviews2026-08-16 — 50 pageviews2026-08-19 — 42 pageviews2026-08-22 — 58 pageviews2026-08-25 — 49 pageviews2026-08-26 — 53 pageviews
Daily Wikipedia pageviews (attention proxy, census-recorded).

Details

WindowsSingle-playerFamily Sharing1 DLC

3 supported languages: English, Japanese, Simplified Chinese

Player tags

2DCuteAnimeCasualHorrorMysteryVampireAdventureDetectiveStory Rich

Census log

Computed from census-recorded observations only — dates are observation dates.

Players also track

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Similarity via IGDB.

Official site ↗Wikipedia ↗