The story takes place in a fictional world called Arcadia, where life-draining monsters called Thanatos plague the populace. The only ones who have the power to exterminate these creatures are Purifiers, but only a few exist. One day, Angelique, who is just a presumably normal girl attending school, is visited by Nyx, a rich gentlemen, as well as a Purifier, who created an organization comprised of Purifiers dedicated to eliminating Thanatos. (Source: Crunchy Roll)
