The capital of the empire of Euria is attacked by the empire of Titania, a much more powerful enemy that controls a large part of the galaxy. The story follows a soldier who flees the Titania empire and seeks refuge with the rebellion force, that rose up since the battle.
This show is pretty cool... if I were to describe it in a nutshell I might call it Code Geass in space. The viewer gets to enjoy two viewpoints while watching the anime: a rebel who is finding his own resolve for resisting a powerful interplanetary government, and the internal politics associated with the nobility of Tytania. All in all, it is really entertaining and my only complaint is that the show does not give the viewer enough closure.