"In the year 2010A.D., Hyper Hurricanes born concurrently all over the world caused severe damage. Five billion people lost their lives, decreasing the world's population to 3 billion. World were frozen under solid ice; plains sank beneath seas. Human civilizations enters a chaotic era.The Japanese Government created special economic areas which have achieved a limited degree of recovery pursuant to the disaster. However, poverty flourished outside of these economic zones and slums were widespread. The ruling class called themselves "Logos" and maintained their position by force of arms, introducing Powered Assist Technology into the military. They call the poor "Revenus", who are exiled to live outside the special economic areas.Time has passed since then. The main characters, Katsuragi Jo and Tsurasawa Hitoshi, escape from "Phantom", a special force organised to watch Revenus and to suppress renegade elements of the Logos, taking with them a mysterious girl, Noto Saya. There are many who are interested in her, all with their own personal motives. ."