"When the sun glances upon my skin I know I am safe and it is the light that guides me from darkness. The dark has never concerned humans before until "Massacre" day and sometimes I feel like it's just a dream, cause every night I have nightmares about the Grimms, they haunt me in my sleep and I am afraid that someday they will haunt me outside of the walls." Celestine who lives in a refuge up in the cascade mountains for protection, is one of the few humans that has survived and is living by the vicious flesh-eating creatures called Grimms that have overrun the world, as humans have become their predators and are haunted by the night-living monsters. humanity is being threatened of extinction, and Celestine try to survive while she begins her most dangerous and important journey of her life.