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

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！

2
playing now
76%
positive of 302 reviews
Mostly Positive
steam rating
50,000–100,000
owners (SteamSpy est.)
pending
deck/linux tier (ProtonDB)
$10.99
steam price (US)

2 players in-game as of 2026-08-30 09:00 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

Insufficient data
  • · Not enough review history collected yet to judge health.
  • · Top 53% of 10,791 Action games in the census by review count.
Estimated sales: 7.5k–18k copies

Review-multiple estimate from 302 total reviews — how this is computed.

Players online

202026-08-11 22:00 — 1 players2026-08-12 13:00 — 2 players2026-08-13 05:00 — 0 players2026-08-13 21:00 — 0 players2026-08-14 13:00 — 1 players2026-08-15 05:00 — 0 players2026-08-15 20:00 — 1 players2026-08-16 12:00 — 1 players2026-08-17 04:00 — 0 players2026-08-17 20:00 — 0 players2026-08-18 12:00 — 0 players2026-08-19 04:00 — 0 players2026-08-19 19:00 — 0 players2026-08-20 11:00 — 2 players2026-08-21 03:00 — 0 players2026-08-21 19:00 — 1 players2026-08-22 10:00 — 0 players2026-08-23 02:00 — 1 players2026-08-23 18:00 — 0 players2026-08-24 10:00 — 0 players2026-08-25 02:00 — 1 players2026-08-25 17:00 — 0 players2026-08-26 10:00 — 1 players2026-08-27 02:00 — 2 players2026-08-27 18:00 — 0 players2026-08-28 10:00 — 0 players2026-08-29 02:00 — 1 players2026-08-29 16:00 — 1 players2026-08-30 09:00 — 2 players
Concurrent players, hourly average, last 30 days (census samples).

Attention

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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 ↗