Amidst the glimmer of neon lights technological advancement causes humans to be consumed by commercial convenience. In the shadows a war between the Yatagarasu and the Phantom Society is brewing Devil Summoners who harness the otherworldly powers of Demons. Existing in the secret sea of humanitys data a digital hivemind has evolved into sentience Aion. Observing humankind from afar Aion calculates that a world-ending disaster is imminent and creates two agents to combat against it Ringo and Figue. Together these agents of Aion must investigate and prevent a butterfly effect that will lead to the end of the world.