Amidst the neon lights, technological advances have made people stuck in commercial convenience. In the shadows, a war is brewing between the Yatagarasu and the Phantom Society - Devil Summoners who can harness the powers of supernatural demons.

Among humanitys secret data, a collective consciousness has come to life: Aion. Aion, observing humanity from a distance, has calculated that a doomsday disaster is imminent and creates two agents to prevent it: Ringo and Figue.
Together, these agents must investigate and prevent a butterfly effect that leads to the end of the world.