The city of New Jisei started off as nothing more than a radiation scrubbing island off the coast of Hokkaido. After its initial task was completed, the island became a hub of vagabonds and illicit types. A hub of the black market tech trade as they smuggled the hottest and newest tech out of Japan into nearby Russia and from there the world. It didn't take long for the corporations to notice the small thriving ecosystem and how profitable it could be. Greasing the pockets of the Diet, the Corporation's had New Jisei declared a Free Economic Zone or FEZ for short. Essentially this would mean that the Corporations would benefit from all the protections that the mainland government provided with none of the limiting restrictions. Shorty afterwards the corporations moved in kicking out the riffraff and establishing their capitalist utopia.
As expanding perpetually outward would cost more and more money, New Jisei has instead grown upward. A rising anthill like mass of interconnecting walkways, bridges, and roads that connect the various skyscrapers and other buildings. Wealth and status is easily determined in the city, the poor are filtered to the bottom where the sunlight barely reaches them, while the wealthy live in their castles floating in the sky high above, two separate worlds living within the same tight confines.
On paper the city is a place of unlimited freedom, anyone can start a business if they have the cash to pay for a license and there is little to no regulation of what actually is produced or sold in the city. Essentially though the city is run by a group of five corporations known as the Corporate Council, nothing happens in New Jisei without the Council's approval and most of the wealth in the city has a strange way of making its path back into their hands. These five corporations are:
Tsukuda Medical, Sasaki Heavy Industries, Nyo International, Zykov-Azarov Synthetics Group, and Byun Associates. At the moment the de facto "head" of the Council is the ever-present Tsukuda Medical.