Japanese

銀河英雄伝説外伝　黄金の翼

English

Ginga Eiyuu Densetsu Gaiden: Ougon no Tsubasa

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.(Source: ANN)