Elfina: Yoru e to Urareta Oukoku de... The Animation
Genres: Fantasy, Hentai
Type: OVA, Episodes: 3
Aired: Aug 22, 2003 to Jan 23, 2004
Studio: Himajin Planning
Source: Visual novel
Rating: Rx - Hentai
Synopsis:
Elfina lived a life of luxury as a member of the royal family. She was waited on hand and foot and had a team of servants. That was until her country was invaded! Now Elfina must comply to the sexual demands of her new masters and it doesn't matter how humiliating or intimate the favors! 

(Source: AniDB)