Lian Vier has spent his life hiding at Sanctum Academy as a harmless mixed-blood student, while in truth he is the last pure-blood male incubus under a kill-on-sight order. When a loss of control throws him into the arms of Lance Silverwood, the exorcist heir born to destroy him, blackmail, black-market hunters, and an abyss ritual close in. Lance chooses to feed him, bind himself to him, and fight beside him; when the buried truth about the demon purge is exposed, Lian stops being prey and becomes the one who judges the hunters.