When her mother becomes gravely ill, Alma discovers a clue about her estranged father and writes a message begging for help. Little does she know that she is a bastard of House Avera, one of the four noble families that serve the gods and are imbued with their powers. In a desperate exchange for her mother’s medicine, Alma agrees to sacrifice her left arm to the Beast in a ceremony that will bind her forever to the House and its deity. Regardless, her mother soon passes, leaving Alma trapped inside the Avera’s grand estate. Now vengeance is the only thing that keeps Alma going. That, and the strange connection she has with her god --- a monster who is constantly by her side. He tells Alma that she has been chosen to bring change upon their world, and with his help, Alma plots a perilous journey to destroy the House that stole everything from her.