The story takes place in a distant future, when the Earth has been completely destroyed by the pollution created by humans, and even more pollution has produced evil monsters that are rampant and occupying human living space. Helpless, humans can only migrate to "self disciplined mobile cities" with independent consciousness, and these cities compete with each other in order to
The story takes place in a distant future, when the Earth has been completely destroyed by the pollution created by humans, and even more pollution has produced evil monsters that are rampant and occupying human living space. Helpless, humans can only migrate to "self disciplined mobile cities" with independent consciousness, and these cities compete with each other in order to