Demonbane is a series of 6 novels and 2 visual novels by Nitro+ with mecha and Cthulhu Mythos elements. In 2006 a 12 episode anime titled Kishin Houkou Demonbane was aired. The anime is basically a retelling of the first visual novel Zanmataisei Demonbane with many things cut out or changed. The series focuses on a young man Kurou Daijuji, who once studied magic at the Miskatonic University but later quit due to a certain incident and opened a small detective agency. One day he recieves a job from Ruri Hadou, the young head of the Hadou Financial Group, to find a powerful grimoire.