In order to trace the culprit behind his family’s murder in his childhood, Vampire Hunter Heilo accepts a kill order from a client. His target is the head of the Livera Group, Herrace. Heilo joins Herrace’s company, and successfully acquires a position as the personal secretary of Herrace himself, who is known for his dominating presence in politics and the underworld. However, Herrace’s special treatment gradually causes Heilo’s heart to sway… What will his fate be, having fallen for the man he's supposed to kill?!