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秘封ナイトメアダイアリー 〜 Violet Detector is a vertically-scrolling photography danmaku game, and is the 16.5th official installment of Touhou Project. The gameplay is similar that of Shoot the Bullet and Double Spoiler, however, Violet Detector has Sumireko Usami as a playable character instead of Aya Shameimaru.
Sumireko becomes trapped in a nightmare in which everyone in Gensokyo is out to get her. She decides to take pictures of their danmaku to post onto social media. These nightmares continue for three weeks.