Touhou Tenkuushou ~Hidden Star in Four Seasons, the latest Touhou game, will be available for purchase on Steam on November 17, 2017. The game will only support Japanese.
This game is the sixteenth game in the series, and was announced in April 2017 and released at Comiket 91 in August 2017. According to ZUN, creator of Touhou Project, the game is meant to be a basic, back-to-roots shooting game.
Touhou Tenkuushou ~Hidden Star in Four Seasons will be available on Steam starting on November 17, 2017.