Kishin Houkou Demonbane

A struggling detective named Kuro Daijuuji is hired by Ruri Hado from Hado Financial Group to locate a magical book. After being convinced by a generous payment, he agrees to the task. During his search, he meets Al, a girl who is actually a potent grimoire. They form a pact, granting Kuro magical abilities. Shortly after, Al triggers Demonbane, a powerful device belonging to Hado Financial Group, to confront a threat from the Black Lodge. This action sparks a conflict between Hado Financial Group and the Black Lodge.