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: A powerful grimoire spirit who has fought for millennia. Though short-tempered and arrogant, she is dedicated to destroying evil gods.

: Kurou is hired by Ruri Hadou, head of the Hadou Financial Group, to find a powerful grimoire to combat the Black Lodge , a criminal sorcery syndicate. deus-machina-demonbane-fasiso

: An all-ages version for the PlayStation 2 titled Kishin Houkou Demonbane (2004) and a subsequent PC port. : A powerful grimoire spirit who has fought for millennia

The narrative is primarily set in , a region heavily inspired by the Cthulhu Mythos, featuring locations like Miskatonic University and Innsmouth. head of the Hadou Financial Group

Originally released in 2003 as an eroge (adult) visual novel titled Zanma Taisei Demonbane , the series has expanded into multiple formats: