Earth has Fallen. Uthum, a ruthless god from another dimension, has sent an unending zombie horde to wipe out humanity. The Slayers are chosen by their god to save the planet. The Call chooses indiscriminately, ripping them from their world and forcing them into a hostile situation where they are not fully trusted by humanity and live short lives full of death. Things quickly begin to change after NightSlayer meets Novi on a rooftop garden that she tends for her masters.