Din Morrison has always felt overshadowed by his sister, Katherine, an experienced knight. He aims to make a name for himself and prove his worth to his sister. Until one day, his life changes when the moon shifts and his friend, Lorelei, transforms into a demon. Rather than turning her over to the Executioners, he must protect her and find a way to turn her back. On his quest, he encounters great ordeals that reveal the dark history of the world and that of his lineage.