With a heart full of kindness, Asarella ignores the commands of her master, Arch-Mage Eliwho, and steps into the foreboding Devil's Castle. Tragic events occur, resulting in Asarella entering into a dangerous agreement with The Devil. Meanwhile, Eliwho, who secretly harbors feelings for his apprentice, complicates her training as she prepares for the impending battle capable of initiating the apocalypse. An unprecedented love triangle unfolds in a unique and unparalleled setting and time.