Touhou Kaikidan ~ Mystic Square

Following the events of Lotus Land Story, a massive quantity of demons beings to pour out of a cave, once again buried in the mountains. Seeking the source of this invasion, Reimu Hakurei and the other playable characters, Marisa Kirisame, Mima, and Yuuka Kazami must travel to Makai and journey to the fortress Pandemonium in order to confront the one behind the problem, Shinki. (Touhou Wiki)