❝They are the most bloodthirsty of us all. The most evil of us all, in fact.❞ The children of Karlheinz and a demon by the name of Rohesia, are cold-blooded, temperamental and heavily guarded from the inside. They are powerful, because of their cross-bred genes of a demon and a vampire. When their mother dies by the hands of a well-known hunter, Seiji Komori, a demon and vampire hunter, they move in with their hesitant half-siblings.