A thousand years after the great End War, Earth has turned into a medieval place. It is a world of swords, stone fortresses, and strange beasts.

In this world, a girl named Corvala seeks to save her father condemned to die. In her search, she finds Serapha--a woman unlocked from deep underground.

Serapha claims that Corvala has a critical task to perform. One that will determine the fate of the land.

But Corvala doesn't know whether or not she can trust this mysterious woman. For one thing is certain: Serapha isn't human.