This is the 11th Touhou game. It was announced on May 1, 2008. A demo was released at the Reitaisai 5 convention alongside the full version of Scarlet Weather Rhapsody. The full version was released on August 16, 2008 at Comiket 74. A mysterious geyser appears one day near the Hakurei Shrine, which also seems to spout evil spirits from underground. Reimu or Marisa go underground with the help of one of three yōkai (Yukari Yakumo, Suika Ibuki, or Aya Syameimaru for Reimu; Alice Margatroid, Patchouli Knowledge, or Nitori Kawashiro for Marisa) and stop the source of the geyser before things get far too out of hand.