Kijoku: Princess Double Kari
English title: Slutty-Princess Diaries
Japanese title: 姫辱 -プリンセスダブル狩り-
Type: OVA
Source: Visual novel
Episodes: 3
Status: Finished Airing
Aired: Aug 27, 2004 to Dec 24, 2004
Duration: 26 min per ep
Rating: Rx - Hentai
Studios: Studio Soul
Producers: Animac
Licensors: JapanAnime
Genres: Hentai

Distol, a prince of Asteria, had passed humiliating days as a hostage in the neighboring country Bartrage, for 8 years. His mother had been also sent to the country, but she ended up dying. Since then, he made efforts to learn fencing and acquiring the knowledge and cultures in order to protect important himself. However, one day, he knew that his sister-in-law whom he had left in his country was elected as a "Holy Lady" in order to seal Satan. Holy Lady would devote her life to seal Satan. Because he couldn't save his loving sister, he felt his weakness. 

Then a beautiful girl in black clothes appeared in front of him, and she said she was a witch. In exchange for a strong magic to save his sister, she imposed two conditions on him. They were that he would invade Bartrage to get the secret treasure of the royal family, and that he would kidnap Princess Irina. 

(Source: AniDB)