What was supposed to be another regular day under the tyrannical Ellish regime took a turn for the strange when Artemis, a young girl trying to cope with the current way of life, found a mysterious stranger who can't remember anything about her past life.

Furthermore, the girl seems completely immune to the restrictive powers of the dreaded Black Rosaries, objects that put down an entire civilization.

Having found this person with a seemingly infinite potential, the both of them are forced to take actions that would ultimately shape the world.