The end of the world is approaching, and pollution has swept the world. Explosions, radiation, and nearly destructive wars have reduced mankind's century-old foundation to nothing. Some people died from pollution, and more people died silently in wars and artillery fire. In order to end the war, solve the current situation, preserve the last hope of mankind, and leave the fire of life, the federal government was established.
Human beings arranged the base in a spiral like a Fibonacci sequence. The first area in the center was protected. High walls were built in order to resist external pollution. They were divided into nineteen areas according to the order of purifying pollution.
