Shikigami no Shiro (roughly translated as Castle of Spirits; known as Castle of Shikigami in the West) is a series of arcade Bullet Hell shoot 'em ups developed by Alfa System. The overarching plot involves a mysterious castle in the country of Alcaland, which has been the subject of many "missing persons" cases. A handful of psychics have converged on the location to conduct their own investigations of the incident, each for his or her own reasons.As of 2008, all three of the main games have been released in the U.S. for the PlayStation 2 (for the first two games) and Nintendo Wii (SnS III). Other ports on Sega Dreamcast (SnS II), Nintendo GameCube (SnS II), Xbox (SnS II), and Xbox 360 (SnS III) are also available, but only in Japan. The entire series also saw Japan-only PC ports, however a Fan Translation is in the works for the first game's PC port.
This series uses the following tropes: