Driven to the verge of extinction by "Aragami," a race of all-devouring monsters, humanity makes its last stand in isolated points of resistance. Invulnerable to conventional damage, only "Oracle Cell" weapons—composed of the same matter which makes up Aragami—can kill these creatures. However, due to their god-like ability to adapt, the Aragami soon develop further immunity. Having no other hope of fending off the e...