http://collectr.blogspot.com/2017/08/eien-no-filena.html
The protagonist of the story, Filena, is the surviving princess of a kingdom called Filosena, which is wiped out by the Empire in the opening moments of the story. Raised as a boy, Filena fights as a Battler, using her wits and speed to compensate for her small stature and lack of strength. With the help of friends, including her "wife" Lila - another slave - Filena must outwit and outlast her enemies in order to reclaim her destiny and her throne.
6 episode OVA of that one old thing got subbed.
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