An 18 Year old boy named Reku, created by the King Of Hell to destroy anything standing in his way finally is given permission to leave the ocean district of Hell, Rasial, and Hell itself to venture through other worlds, on his first ever King given mission. Sent off with only a list of people he was kill, and his trusty Eagle friend Misaki, many things, about himself, his King, other worlds, and dangers he never imagined could exist.