For one hundred and fifty years, two interstellar powers have battled for supremacy in the Milky Way. The Galactic Empire, under the rule of Kaiser Friedrich IV and a deeply entrenched aristocracy, aims to quash any rebellious factions that dare to challenge the unassailable crown. Meanwhile, the Free Planets Alliance, a representative democracy overseen by a corrupt High Council, has devolved into a war-mongering entity that utilizes conflict to gain popular support. However, this prolonged deadlock between the Empire and the Alliance is shattered with the ascent of two opposing military prodigies. Reinhard von Lohengramm, a low-ranking noble and Imperial High Admiral, is determined to conquer the entire galaxy and bring humanity under his strict authority, buoyed by his strategic acumen and his sister's favored status as the Kaiser's mistress. At the same time, Yang Wen-li, an enthusiastic historian and unforeseen commodore known as the Hero of El Facil, employs his tactical genius to circumvent his superiors' ineptitude and chart a course towards lasting peace. As the conflict escalates, Reinhard and Yang both endeavor to realize their ideals and establish themselves as the foremost galactic heroes in a new age.