Princess Knight☆Catue
Japanese title: プリンセスナイト☆カチュア
Type: OVA
Episodes: 3
Source: Visual novel
Genres: Fantasy, Hentai
Studios: Studio 9 Maiami
Producers: Valkyria
Duration: 29 min per ep
Rating: Rx - 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)