Old Light and Morning Light

In order to fight against the empire's ever-expanding desires and ambitions, those countries that had been encroached upon by the empire's claws united and launched a protracted war on a stage with the vast universe as a picture. At the same time, the young man who wants to trace the past of his parents is eventually involved in the whirlpool of conspiracy. What kind of answer will he find among the competition between the various forces?