Gachiakuta takes place in a dystopian world where there exists a floating country-sized structure known as the Sphere (天界, Tenkai), which runs on a social caste system that divides the rich and wealthy society from the poor “tribesfolk” living around the outer perimeter—descended from notorious criminals and exiled by the upper-class—by way of a heavily-guarded wall. Both sides of the caste dump their trash and unwanted waste, as well as people convicted of any crime, down the “Pit”, a never-end
