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.

The Case Book of Arne is an Adventure, Indie and RPG game released in 2020, priced at $5.99, with an estimated 20,000 to 50,000 owners and a Very Positive review sentiment (88% of 369 reviews).

0
playing now
88%
positive of 369 reviews
Very Positive
steam's rating (official)
20,000–50,000
owners (SteamSpy est.)
platinum
deck/linux tier (ProtonDB)
Unknown
Steam Deck (Valve)
SteamOS: 0
$5.99
steam price (US)

0 players in-game as of 2026-10-14 22:00 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

Quietly active
  • · 0 players in-game at the last census sample.
  • · 29 reviews in the last 8 weeks (~4/week).
  • · Review velocity up 12% vs the prior 8 weeks.
  • · Top 22% of 28,920 Adventure games in the census by review count.

Health tier since 2026-09-01

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 6 of 11 observed days (census price snapshots)

Review momentum

PositiveNegative
313120202026Week of 2020-10-01: 13 positiveWeek of 2020-11-01: 31 positiveWeek of 2020-11-01: 3 negativeWeek of 2020-12-01: 13 positiveWeek of 2021-01-01: 17 positiveWeek of 2021-02-01: 7 positiveWeek of 2021-03-01: 10 positiveWeek of 2021-04-01: 8 positiveWeek of 2021-05-01: 14 positiveWeek of 2021-05-01: 2 negativeWeek of 2021-06-01: 17 positiveWeek of 2021-06-01: 1 negativeWeek of 2021-07-01: 16 positiveWeek of 2021-07-01: 1 negativeWeek of 2021-08-01: 6 positiveWeek of 2021-08-01: 3 negativeWeek of 2021-09-01: 4 positiveWeek of 2021-10-01: 4 positiveWeek of 2021-11-01: 5 positiveWeek of 2021-11-01: 1 negativeWeek of 2021-12-01: 1 positiveWeek of 2021-12-01: 1 negativeWeek of 2022-01-01: 1 positiveWeek of 2022-01-01: 1 negativeWeek of 2022-02-01: 7 positiveWeek of 2022-03-01: 6 positiveWeek of 2022-04-01: 3 positiveWeek of 2022-04-01: 1 negativeWeek of 2022-05-01: 7 positiveWeek of 2022-06-01: 5 positiveWeek of 2022-06-01: 3 negativeWeek of 2022-07-01: 5 positiveWeek of 2022-08-01: 2 positiveWeek of 2022-09-01: 2 positiveWeek of 2022-10-01: 3 positiveWeek of 2022-11-01: 6 positiveWeek of 2022-12-01: 1 positiveWeek of 2022-12-01: 1 negativeWeek of 2023-01-01: 1 negativeWeek of 2023-02-01: 7 positiveWeek of 2023-03-01: 3 positiveWeek of 2023-03-01: 1 negativeWeek of 2023-04-01: 3 positiveWeek of 2023-04-01: 1 negativeWeek of 2023-05-01: 7 positiveWeek of 2023-06-01: 3 positiveWeek of 2023-07-01: 4 positiveWeek of 2023-07-01: 1 negativeWeek of 2023-09-01: 2 positiveWeek of 2023-09-01: 1 negativeWeek of 2023-11-01: 5 positiveWeek of 2023-12-01: 5 positiveWeek of 2023-12-01: 1 negativeWeek of 2024-01-01: 5 positiveWeek of 2024-02-01: 2 positiveWeek of 2024-03-01: 3 positiveWeek of 2024-03-01: 1 negativeWeek of 2024-06-01: 1 negativeWeek of 2024-07-01: 1 positiveWeek of 2024-08-01: 1 positiveWeek of 2024-09-01: 1 positiveWeek of 2024-10-01: 2 positiveWeek of 2024-11-01: 1 positiveWeek of 2024-11-01: 1 negativeWeek of 2024-12-01: 1 positiveWeek of 2025-01-01: 1 positiveWeek of 2025-03-01: 1 negativeWeek of 2025-04-01: 1 positiveWeek of 2025-06-01: 5 positiveWeek of 2025-06-01: 2 negativeWeek of 2025-07-01: 4 positiveWeek of 2025-08-01: 1 positiveWeek of 2025-08-01: 1 negativeWeek of 2025-09-01: 1 positiveWeek of 2025-09-01: 1 negativeWeek of 2025-10-01: 5 positiveWeek of 2025-10-01: 2 negativeWeek of 2025-11-01: 2 negativeWeek of 2025-12-01: 1 positiveWeek of 2026-01-01: 3 positiveWeek of 2026-01-01: 2 negativeWeek of 2026-02-01: 5 positiveWeek of 2026-02-01: 3 negativeWeek of 2026-03-01: 2 positiveWeek of 2026-03-01: 1 negativeWeek of 2026-04-01: 3 positiveWeek of 2026-05-01: 2 positiveWeek of 2026-06-01: 3 positiveWeek of 2026-06-01: 1 negativeWeek of 2026-07-01: 3 positiveWeek of 2026-08-01: 1 positiveWeek of 2026-08-01: 1 negative
Weekly review counts (Steam review histogram). Positive above the line, negative below.

Players online

202026-09-15 07:00 — 0 players2026-09-16 15:00 — 1 players2026-09-17 23:00 — 0 players2026-09-19 06:00 — 0 players2026-09-20 14:00 — 1 players2026-09-21 22:00 — 0 players2026-09-23 05:00 — 0 players2026-09-24 13:00 — 0 players2026-09-25 20:00 — 0 players2026-09-27 04:00 — 0 players2026-09-28 11:00 — 1 players2026-09-29 19:00 — 0 players2026-10-01 02:00 — 0 players2026-10-02 10:00 — 0 players2026-10-03 17:00 — 0 players2026-10-05 01:00 — 0 players2026-10-06 09:00 — 0 players2026-10-07 16:00 — 0 players2026-10-09 00:00 — 0 players2026-10-10 07:00 — 0 players2026-10-11 15:00 — 0 players2026-10-12 23:00 — 0 players2026-10-14 06:00 — 1 players2026-10-14 22:00 — 0 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

101252026-05-30 — 36 pageviews2026-06-03 — 79 pageviews2026-06-07 — 83 pageviews2026-06-11 — 53 pageviews2026-06-15 — 76 pageviews2026-06-19 — 49 pageviews2026-06-23 — 95 pageviews2026-06-27 — 65 pageviews2026-07-01 — 47 pageviews2026-07-05 — 53 pageviews2026-07-09 — 54 pageviews2026-07-13 — 56 pageviews2026-07-17 — 81 pageviews2026-07-21 — 45 pageviews2026-07-25 — 55 pageviews2026-07-29 — 35 pageviews2026-08-02 — 41 pageviews2026-08-06 — 51 pageviews2026-08-10 — 51 pageviews2026-08-14 — 55 pageviews2026-08-18 — 28 pageviews2026-08-22 — 58 pageviews2026-08-26 — 53 pageviews2026-08-30 — 36 pageviews2026-09-03 — 37 pageviews2026-09-07 — 48 pageviews2026-09-11 — 33 pageviews2026-09-15 — 30 pageviews2026-09-19 — 56 pageviews2026-09-23 — 48 pageviews2026-09-27 — 39 pageviews2026-10-01 — 34 pageviews2026-10-05 — 39 pageviews2026-10-08 — 59 pageviews
Daily Wikipedia pageviews (attention proxy, census-recorded).

Details

WindowsSingle-playerFamily Sharing1 DLC

3 supported languages: English, Japanese, Simplified Chinese

Post-launch support: 1 DLC released, first 2021-03-02 (Steam store data)

Player tags

2DCuteAnimeCasualHorrorMysteryVampireAdventureDetectiveStory Rich

Census log

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

Players also track

Don't Knock TwiceMasochisiaRusty Lake HotelVampire: The Masquerade® - Bloodlines™ 2Forgotton AnneInflictionEternity: The Last UnicornDraugen

Similarity via IGDB.

Official site ↗Wikipedia ↗