When her father Baron Reyes, was murdered by an unknown killer, Zeya Reyes, his outlawed daughter, was immediately set to be the next heir to the throne as the Empress of Stygia, the land of everlasting shadows.
Once arriving back at her home nation, Zeya finally sees with her own eyes of the terror this monster has created and sets out to find the culprit. In order to do this however, Zeya has no choice but to rekindle her relationships with the people from her past that she dreads so much; Including a man named Varen Edevane, the young Emperor of Stygia's neighboring nation, Exousia.
However, as much as is it against the princess's wishes, Varen too needs her help to resolve the same problem happening in his own empire, countless innocent people unjustly murdered by the very same culprit that was responsible for Baron's death.
As the mayhem caused by these mysterious monsters begin to grow larger, Zeya and Varen have no choice but to set aside their differences and past in order to bring back the peace their nations fought so hard for after the war.