Amidst the flickering neon lights, technological advancements are consuming humanity. A war is brewing between the Yatagarasu and the Phantom Society – hellish summoners who wield the otherworldly powers of “demons.”

Existing in a mysterious sea of human data, the digital collective mind has transformed into a living being: Aion. Observing humanity from afar, Aion calculates that the world will be destroyed by an inevitable catastrophe. He creates two agents to prevent this cataclysm: Ringo and Figue.

Together, the Aion agents must investigate the butterfly effect that heralds the end of the world and prevent it.