Yui Komori's priest father leaves her behind in Japan when he accepts a new assignment in Eastern Europe. Entering the foreboding mansion belonging to distant relatives she has never known, she steps into evident darkness. In what little light there is, she notices a figure sleeping on a couch and approaches him, making several observations in quick succession: he is remarkably good-looking as well as cold to the touch, not to mention he is not breathing. She is prevented from calling an ambulance by a sudden aberration in her heartbeat, and in that moment of hesitation, the person whom she presumed to be dead sits up and speaks! The handsome stranger complains that she woke him and asks for a treat in compensation, flashing fangs in his mouth. Desperate for rescue, Yui screams and attracts the other occupants of the house. Each new arrival looks as striking as the last, but they all appear to be vampires as well. The Sakamaki brothers—Shuu, Reiji, Ayato, Kanato, Laito, and Subaru—s