A big earthquake demolishes the capital of Japan, and it splits the main land into halves. Japan is divided into the northern and the southern parts. They accept aides from two large countries, i.e., United States and China. However, actually, it is occupation named "aid". Many Japanese become refugees to go to foreign countries. But, the recovery from the disaster doesn't work well, and frictions between the inhabitants and the refugees who can't go home are getting serious.

Source: AnimeNfo

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