Ginga Eiyuu Densetsu Gaiden: Ougon no Tsubasa

銀河ぎんが英雄えいゆー伝説でんせつ外伝がいでん　黄金おーごんの翼つばさ

Reinhard von Müsel, a poor nobleman's son, one day discovers that his sister, Annerose, has been sold to the royal family. To get her back he sets out to rise quickly through the military along with his friend Siegfried Kircheis.