The demon invasion ended in the Great War. A war that bled the continents. A war that ended with the Empire. But the enemy was not defeated. And now, a thousand years later, the demons found a loophole out of their prison. The young Countess Isabella Cort becomes the target of demons, all because of a strange artifact found in her father's body. And now you need to survive, find the killers and understand what is happening. But this is impossible alone, and she turns to the imperial family, to the force that once defeated the demons, to those called dragons. What will come of this union of man and those who have long ceased to be considered human?