At the end of the world, three broken girls entrusted with the piloting of biomechanical monstrosities known as Dreadnoughts are all that stand between humanity and annihilation at the hands of the Lilim, a race of monstrous giant women from another world. As sanity and civilization teeter in the balance, Leah, El, and Kelly struggle to reconcile their hated minds and bodies with the perfect engines of destruction with which they must bond to survive.