Tytania

Also known as:  Titania

The TV anime series Tytania was adapted by studio Artland, based on Yoshiki Tanaka's series of "space opera" novels. In the story, 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. (ANN synopsis)

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Producers, official website and other details: AniDB, ANN, Wiki