The polluted surface is no longer suitable for human survival. Various human countries have developed ghost city plans called the "Noah System." From then on, in the polluted atmosphere, humans can only survive in the white and cold steel world.
The three countries that divide the airspace, the Federation, the Empire, and the Republic, have been in an antagonistic relationship for nearly a hundred years. Federal Staff Officer Lian M. Doff and soldier Lokensey Lackland met in a sacrificial battle during World War II. The two people, who were incompatible with their morals and ideas, got to know each other during the war. The feelings that grew up in the cruel environment were too fragile to be taken seriously. At this time, the tension between the three countries had reached its peak during the second reconciliation period. An assassination at a peace conference prompted the situation in the three countries to change...
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