Franchise context: The write-up below is from the parent franchise article (anime, book series, or IP) rather than the card game itself. A dedicated CCG profile has not been written yet.
Demonbane is a Japanese visual novel series by Nitroplus with mecha and Cthulhu Mythos elements. Beginning as an eroge visual novel for the PC, it was ported into a PlayStation 2 non-eroge remake, and spawned a sequel visual novel, a prequel novel, an anime television adaptation and a conversion to manga. An English version of the original Demonbane PC game was released by JAST USA. The anime is currently streamed with English subtitles by Crunchyroll.
Source: en.wikipedia.org/wiki/Demonbane