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Index › 2010s › Hifuu Nightmare Diary: Violet Detector.
Hifuu Nightmare Diary: Violet Detector. cover art

Hifuu Nightmare Diary: Violet Detector.

AKA: TH16.5, VD, 秘封ナイトメアダイアリー
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Hifuu Nightmare Diary: Violet Detector.

Steam $10.99

Violet Detector, like its predecessors Shoot the Bullet, Double Spoiler and Impossible Spell Card, is a collection of many individual danmaku patterns that the player can choose from at their leisure. In addition to the usual mechanic of taking photographs that clear enemy bullets, Sumireko has several psychic superpowers at her disposal, such as teleportation. The game features all of the characters who debuted in Legacy of Lunatic Kingdom and Hidden Star in Four Seasons, plus Reimu, Marisa, and most of the final and EX bosses from previous games.

Year
2018
Developer
Team Shanghai Alice
Publisher
Team Shanghai Alice

SCREENSHOTS

HISTORY

Hifuu Nightmare Diary ~ Violet Detector (秘封ナイトメアダイアリー 〜 Violet Detector.; lit. "Secret Sealing Nightmare Diary") 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.

Gameplay

Violet Detector is a two-dimensional shoot 'em up game in which the player has to shoot at a single enemy boss to deplete them of their health, whilst avoiding their attacks. Unlike the previous photography Touhou games (Shoot the Bullet and Double Spoiler), the player's camera is not their only means of attack, and the gameplay is more characteristic of the regular Touhou games. The player has a regular shot, which is used to defeat enemies, and the camera holds a secondary role, being capable of removing enemy bullets, but it must be charged before it can be used. At least one photograph of the boss must be taken in order for a player to progress to the next stage.

In Violet Detector, each stage consists of only a single boss, who only has a single Spell Card. However, usage of the camera does not provide the player with invulnerability frames, and the player only has one life, which if lost, requires the entire level to be restarted from the beginning. The player is also given the ability to teleport to move out of the enemy's line of fire.

Plot

Sumireko Usami, a magician high-school student from the Outside World (Earth), has the ability to visit Gensokyo, but only during her dreams. She has a recurring dream in which she is attacked by Reimu Hakurei without reason. Sumireko prepared to photograph the danmaku of Reimu and other residents of Gensokyo, for the purpose of uploading it to social media.

Development

Violet Detector was announced on ZUN's blog and Twitter on July 19, 2018. The game was physically distributed on August 10 at the Summer Comiket, and released on Steam on the same day.

ZUN deliberately avoided adding new mechanics into Violet Detector that would make the game easier for newer players, as he wanted to provide players with the satisfaction of being able to complete the game with their own skill, stating in the game's afterword that games that endorse player skill have become less common.

Reception

IGN gave the game a 7/10, saying that "Touhou Violet Detector is quite difficult, but both its story and mechanics deserve praise for their design." The game was criticised for being unforgiving for new players, and for the teleportation mechanic being awkward to use, suggesting that the implementation of difficulty settings and a dedicated teleport keybind would improve the game. On Steam, over 74% of player reviews were positive.

STORY

Sumireko Usami, psychic teenager and frequent visitor to Gensoukyou, finds herself trapped in a nightmare wherein Gensoukyou's residents are relentlessly attacking her with danmaku. A frustrated Sumireko decides to make the best of the situation by photographing the danmaku patterns to share on social media, and after doing so, finds that she's been freed from the dream. Three long weeks of danmaku nightmares follow...

GAMEPLAY VIDEO

STORES

Store
Price
Discount
Lowest ever
$10.99

Prices are cached from each storefront and may be out of date. Last checked 24 Sept 2026.

SCORES

Source
Audience
Score
Reviews
Users
75 / 100
276
Users
75 / 100
4

RELEASES 1 system

System
Platform
Year
Notes
PC
Windows
2018
Original release

GAME DATA

Danmaku
Yes
Series
Touhou Project
Wanted by
528 on ITAD waitlists

SOURCES

Wikipedia, CC BY-SA 4.0
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