The world has evolved into year 2092, and is controlled by one giant security corporation: the i3S. The i3S now dictates the laws of countries, and they have now marked every other species besides every breed of nekos to apprehension. humans, demons, voidwalkers, androids... They're all expelled from society. Anyone who's any other species that's seen by the thousands of guards, who have orders to apprehend every non-human being while patrolling all of the public places you can possibly go to will be neutralized and taken into their hands, forced to live in their underground facility, in which you have to fight to survive.