Legend of Galactic Heroes Gaiden: Golden Wings

銀河英雄伝説外伝・黄金の翼

Source

Legend of the Galactic Heroes
Ginga Eiyuu Densetsu· 銀河英雄伝説
novel

From Viz: The “golden brat” Reinhard von Lohengramm, a military prodigy and admiral of the Galactic Empire, has ambitions beyond protecting the borders or even defeating the empire’s enemies. He seeks to overthrow the old order and become a truly absolute - yet benevolent - dictator. His rival, the humble Yang Wen-li of the Free Planets Alliance, wishes to preserve democracy even if he must sacrifice his political ideals to defeat the empire. Their political and military battles play out over a galactic chessboard in an epic saga fifteen centuries in the making.

Sequel

Legend of Galactic Heroes
Ginga Eiyuu Densetsu· 銀河英雄伝説; 銀英伝
manga

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.