Set in an alternate 19th century, the story focuses on an organization of exorcists, named the Black Order, as they defend humanity against the Noah Family, reincarnations of Noah and his twelve apostles whom bear hatred towards humanity and God led by a man known as the Millennium Earl.

Muhyo and Rojis Bureau of Supernatural Investigations - The series follows Toru Muhyo and Jiro "Roji" Kusano, a young magical law enforcer and his assistant, as they track down and punish spirits based on the articles written in the book of magical law.