Ginga Eiyuu Densetsu Gaiden: Ougon no Tsubasa

In the Galactic Empire, Siegfried Kircheis grows up beside Reinhard von Müsel and Reinhard's beloved older sister Annerose. Their quiet friendship is shattered when Annerose is taken into the Imperial Court as the Kaiser's concubine, a decision Reinhard is powerless to oppose. Humiliated by a system that can simply claim his sister, he resolves to gain enough rank and authority to take her back.

Years later, Reinhard returns in military uniform and invites Kircheis to follow him. Together they enter an armed force ruled by noble privilege, where talent can be as dangerous as failure and every promotion brings Reinhard closer to both his sister and the political heights he intends to conquer. Kircheis chooses to stand at his side, binding his own future to Reinhard's audacious ascent.