In the olden days, humans feared youkais. The youkai who stood at the top and led the tumultuous horde of demons was given the title Lord of Pandemonium, ruler of all monsters, goblins and spirits, master of fear and terror. They also had another name for him... Nurarihyon.

The Greatest Magician. The man universally acknowledged to be the "strongest" of all Magicians. Name, age, affiliation: all unknown. The Strongest Exorcist. The woman who the Vatican recognized as their deadliest exorcist. Name: unknown. Age: unknown. Affiliation: the Church. Recognized as "Humanity's Strongest", will the change the pair bring to the world be carnage or salvation?