After centuries of war and annexation, the world is gradually dominated by two great powers, the Oakley Empire and the Alton Federation. They honored different ideologies and viewed each other as arch-enemies. Four years ago, a world war broke out between these two powers and their allies. In the end, after millions of deaths and injuries, an unconditional peace was reached between the two defeated sides a few weeks ago. Though there appears to have been no significant territorial changes, at least within the empire, there are a number of aspirants who are ready for a revolution. The country seems to be at the crossroads of change.
The protagonist, Yang Che: a veteran who came from the East but fought through the four-year war in the Imperial Army, was assigned to the Imperial Royal First Academy as a military teacher after the war. However, he comes to this academy with one purpose in mind - to kill the Emperor.