In the year 2200 AD, the two major powers in the Earth's orbit, "Xuan Yue" and "Su Yue," ended their more than 50-year Cold War and were about to sign the "Dual Moon Peace Agreement." However, a series of terrorist attacks suddenly occurred in Xuan Yue's circular colonial city called "New Moon City," indicating that fragile human civilization is once again facing a great crisis.
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