The Game Census
秘封ナイトメアダイアリー ～ Violet Detector. cover art

秘封ナイトメアダイアリー ～ Violet Detector.

上海アリス幻樂団 · Mediascape Co., Ltd. · 2018-09-04

Steam

ActionIndie

Franchise: Touhou Project · Modes: Single player · Perspectives: Bird view / Isometric

Releases: Sep 05, 2018 (PC (Microsoft Windows))

東方Project第16.5弾！ 超能力女子高生「宇佐見菫子」に、突如襲いかかる幻想郷の住人達。その恐ろしくも美しい弾幕を、スマホに撮りまくり、SNS映えを狙おう！ サイキカルでSNS映え狙いのシューティング幻想！

秘封ナイトメアダイアリー ～ Violet Detector. is an Action and Indie game released in 2018, priced at $10.99, with an estimated 50,000 to 100,000 owners and a Mostly Positive review sentiment (76% of 304 reviews).

0
playing now
76%
positive of 304 reviews
Mostly Positive
steam's rating (official)
50,000–100,000
owners (SteamSpy est.)
pending
deck/linux tier (ProtonDB)
Unsupported
Steam Deck (Valve)
SteamOS: Unsupported
$10.99
steam price (US)

0 players in-game as of 2026-10-14 18:00 UTC (census sample)

Hifuu Nightmare Diary ~ Violet Detector is the 16.5th Touhou Project game, released at the 94th Comiket on August 10, 2018. It is the third photography video game in the series, and introduces regular shot types alongside the camera, allowing the player to switch between using photographs to destroy bullets, and regular danmaku to deplete enemies of their health.

Health check

Quiet
  • · 0 players in-game at the last census sample.
  • · 11 reviews in the last 8 weeks (~1/week).
  • · Review velocity down 8% vs the prior 8 weeks.
  • · Current weekly pace is under 5% of the all-time peak week (168 reviews).
  • · Top 25% of 27,649 Action games in the census by review count.

Health tier since 2026-09-01

Estimated sales: 7.6k–18k copies

Review-multiple estimate from 304 total reviews — how this is computed.

Review momentum

PositiveNegative
11711720182026Week of 2018-09-01: 117 positiveWeek of 2018-09-01: 51 negativeWeek of 2018-10-01: 7 positiveWeek of 2018-10-01: 2 negativeWeek of 2018-11-01: 5 positiveWeek of 2018-12-01: 5 positiveWeek of 2018-12-01: 2 negativeWeek of 2019-01-01: 6 positiveWeek of 2019-01-01: 1 negativeWeek of 2019-02-01: 2 positiveWeek of 2019-03-01: 7 positiveWeek of 2019-04-01: 7 positiveWeek of 2019-05-01: 1 positiveWeek of 2019-05-01: 1 negativeWeek of 2019-06-01: 5 positiveWeek of 2019-06-01: 2 negativeWeek of 2019-07-01: 4 positiveWeek of 2019-08-01: 1 negativeWeek of 2019-09-01: 2 positiveWeek of 2019-11-01: 1 positiveWeek of 2019-12-01: 1 positiveWeek of 2020-01-01: 1 positiveWeek of 2020-02-01: 2 positiveWeek of 2020-03-01: 1 positiveWeek of 2020-03-01: 1 negativeWeek of 2020-04-01: 1 positiveWeek of 2020-04-01: 1 negativeWeek of 2020-05-01: 1 positiveWeek of 2020-06-01: 2 positiveWeek of 2020-07-01: 2 positiveWeek of 2020-09-01: 1 positiveWeek of 2020-10-01: 1 positiveWeek of 2020-10-01: 1 negativeWeek of 2020-12-01: 4 positiveWeek of 2021-01-01: 3 positiveWeek of 2021-02-01: 1 positiveWeek of 2021-02-01: 1 negativeWeek of 2021-04-01: 2 positiveWeek of 2021-05-01: 3 positiveWeek of 2021-06-01: 1 positiveWeek of 2021-08-01: 1 negativeWeek of 2021-10-01: 1 negativeWeek of 2021-11-01: 2 positiveWeek of 2021-11-01: 1 negativeWeek of 2021-12-01: 1 positiveWeek of 2022-01-01: 2 positiveWeek of 2022-02-01: 1 positiveWeek of 2022-03-01: 1 positiveWeek of 2022-04-01: 3 positiveWeek of 2022-05-01: 1 positiveWeek of 2022-11-01: 1 positiveWeek of 2023-03-01: 1 positiveWeek of 2023-04-01: 1 positiveWeek of 2023-06-01: 1 positiveWeek of 2023-07-01: 1 positiveWeek of 2023-08-01: 1 positiveWeek of 2023-11-01: 1 positiveWeek of 2024-01-01: 1 negativeWeek of 2024-02-01: 1 positiveWeek of 2024-04-01: 1 negativeWeek of 2024-05-01: 1 positiveWeek of 2024-07-01: 2 negativeWeek of 2024-10-01: 1 positiveWeek of 2024-11-01: 2 positiveWeek of 2024-12-01: 1 negativeWeek of 2025-01-01: 2 positiveWeek of 2025-02-01: 1 positiveWeek of 2025-03-01: 2 positiveWeek of 2025-05-01: 1 positiveWeek of 2025-07-01: 1 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: 1 negativeWeek of 2025-12-01: 2 positiveWeek of 2026-01-01: 1 positiveWeek of 2026-02-01: 1 positiveWeek of 2026-02-01: 1 negativeWeek of 2026-04-01: 1 positiveWeek of 2026-06-01: 2 positiveWeek of 2026-07-01: 2 positiveWeek of 2026-08-01: 2 positive
Weekly review counts (Steam review histogram). Positive above the line, negative below.

Players online

302026-09-15 04:00 — 0 players2026-09-16 12:00 — 1 players2026-09-17 19:00 — 0 players2026-09-19 03:00 — 0 players2026-09-20 10:00 — 1 players2026-09-21 18:00 — 1 players2026-09-23 02:00 — 1 players2026-09-24 09:00 — 0 players2026-09-25 17:00 — 1 players2026-09-27 00:00 — 1 players2026-09-28 08:00 — 0 players2026-09-29 15:00 — 3 players2026-09-30 23:00 — 2 players2026-10-02 06:00 — 0 players2026-10-03 14:00 — 1 players2026-10-04 22:00 — 0 players2026-10-06 05:00 — 0 players2026-10-07 13:00 — 0 players2026-10-08 20:00 — 0 players2026-10-10 04:00 — 0 players2026-10-11 11:00 — 1 players2026-10-12 19:00 — 0 players2026-10-14 03:00 — 0 players2026-10-14 18:00 — 0 players
Concurrent players, hourly average, last 30 days (census samples).

Attention

2432026-05-31 — 4 pageviews2026-06-04 — 5 pageviews2026-06-08 — 8 pageviews2026-06-12 — 12 pageviews2026-06-16 — 11 pageviews2026-06-20 — 9 pageviews2026-06-24 — 8 pageviews2026-06-28 — 12 pageviews2026-07-02 — 12 pageviews2026-07-06 — 5 pageviews2026-07-10 — 4 pageviews2026-07-14 — 6 pageviews2026-07-18 — 8 pageviews2026-07-22 — 8 pageviews2026-07-26 — 3 pageviews2026-07-30 — 11 pageviews2026-08-03 — 9 pageviews2026-08-07 — 6 pageviews2026-08-11 — 6 pageviews2026-08-15 — 6 pageviews2026-08-19 — 8 pageviews2026-08-23 — 4 pageviews2026-08-27 — 3 pageviews2026-08-31 — 9 pageviews2026-09-04 — 4 pageviews2026-09-08 — 7 pageviews2026-09-12 — 12 pageviews2026-09-16 — 10 pageviews2026-09-20 — 7 pageviews2026-09-24 — 6 pageviews2026-09-28 — 8 pageviews2026-10-02 — 5 pageviews2026-10-06 — 7 pageviews2026-10-10 — 10 pageviews
Daily Wikipedia pageviews (attention proxy, census-recorded).

Details

WindowsSingle-playerPartial Controller SupportSteam CloudFamily Sharing

1 supported languages: Japanese

Player tags

2DCuteAnimeFaithIndieActionArcadeCasualDifficultBullet Hell

Census log

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

Players also track

東方天空璋 ～ Hidden Star in Four Seasons.Touhou Luna Nights東方紺珠伝 ～ Legacy of Lunatic Kingdom.東方神霊廟 〜 Ten Desires.東方文花帖 ～ Shoot the Bullet.バレットフィリア達の闇市場〜 100th Black Market.

Similarity via IGDB.

Official site ↗Wikipedia ↗