Legend of the Galactic Heroes

The story is staged in the distant future within our own Milky Way Galaxy, approximately in the 35th century. Unlike other science fiction stories, there are no alien civilizations. A portion of the galaxy is filled with terraformed worlds inhabited by interstellar traveling human beings. For 150 years two mighty space powers have intermittently warred with each other: the Galactic Empire and the Free Planets Alliance. (Source: Wikipedia)

Faithful to novels, except some changes may be considered major, e.g., some characters changed from male to female. Covers volume 1 and 2 of the novels.

In humanity's distant future, two interstellar states—the monarchic Galactic Empire and the democratic Free Planets Alliance—are embroiled in a never-ending war. The story focuses on the exploits of rivals Reinhard von Müsel and Yang Wen Li as they rise to power and fame in the Galactic Empire and the Free Planets Alliance.

The backstory of the main work (Legend of the Galactic Heroes), which tells about the childhood of Reinhard and Siegfried and their study at the Military Academy, as well as military service of young lieutenant Yang Wen-li and the attack of the Free Planets Star fleet on Iserlohn.