Kyoya Izayoi is no ordinary high school student — he's one of the few trained in the martial art of Nenpo, and wields a sword known as "Ashura." Little does he know, the walls between this world and the world of the spirits are getting thinner by day... and when the fault line separating these two worlds collapses, the city of Shinjuku is about to face the most devastating horror the human world has ever known. Kyoya is waiting — can he stop a world of demons...?