In a ruined city of the dead, far from civilization, lives the only human child named Will. He is raised by three undead beings: Blood, a heroic skeleton warrior, Mary, a feminine mummy priestess, and Gus, a childish spirit mage. All three teach the boy what they know and pour their tender feelings onto him. One day, the boy begins to wonder who he really is and why he is different from everyone around him. Will gradually uncovers the secrets of the undead that inhabit this lost realm.