"Secret Sealing Nightmare Diary") is the 16.5th Touhou Project game, released at the 94th Comiket on August 10, 2018.

Sumireko Usami, a magician high-school student from the Outside World (Earth), has the ability to visit Gensokyo, but only during her dreams.

Sumireko prepared to photograph the danmaku of Reimu and other residents of Gensokyo, for the purpose of uploading it to social media.

[2][3] The game was physically distributed on August 10 at the Summer Comiket,[4] and released on Steam on the same day.

[5] 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."