Princess Knight☆Catue
Japanese title: プリンセスナイト☆カチュア
Type: OVA
Source: Visual novel
Episodes: 3
Status: Finished Airing
Aired: Jun 11, 2010 to Nov 18, 2011
Duration: 29 min per ep
Rating: Rx - Hentai
Studios: Studio 9 Maiami
Producers: Valkyria
Genres: Fantasy, Hentai

Dragundaala, a country belonging to the descendants of dragons, has been conquered by an army of demons. With the king and queen captured by the demon army general, Ginyol, princess Catue attempts to rescue them, but gets caught. All is not lost, however, as Ginyol agrees to free the king and queen, and withdraw his army entirely if princess Catue can endure his sexual acts of depravity for 7 days.

(Source: ANN)