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In 2027, a mysterious organization called "Chen Chuang" invaded the earth. Humanity was forced to unite to resist. After four months of fierce battle, they finally won the victory and finally drove the invaders from the earth. In the following years, humans rebuilt the five major cities headed by Frost City and restored the city's economy as quickly as possible. Just when everything was moving in a good direction, the continuous riots in the five cities had to force humans to pick up weapons and be ready to fight at all times...