Touhou Koukishin ~ Adventures of Scarlet Curiosity is a 3D RPG released on 16 August during Comiket 86. An updated and remastered version of the game for PlayStation 4, as part of Play, Doujin!, was announced on December 28, 2015. The game was confirmed for localization on June 2, 2016, under XSeed Games, for the digital North American release under the shortened title of "Touhou: Scarlet Curiosity". In May 22, 2018, a Steam version was announced in XSEED's 2018 3rd Party Lineup Announcement Teaser Trailer.

Adventures of Scarlet Curiosity is the first Touhou Project game to be shown in E3.