Eien no Filena
Japanese title: 永遠のフィレーナ
Type: OVA
Episodes: 6
Source: Light novel
Genres: Adventure, Drama, Fantasy
Studios: Pierrot
Producers: Tokuma Shoten
Duration: 27 min per ep
Rating: R - 17+ (violence & profanity)

The story is centered around Filena, a princess who was raised as a boy after her kingdom was conquered.