Princess Knight☆Catue DVD-BOX Special
Genres: Hentai
Type: Special, Episodes: 1
Aired: Sep 14, 2012
Studio: Studio 9 Maiami
Source: Visual novel
Rating: Rx - Hentai
Synopsis:
DVD-BOX special added to the 3rd volume. It shows the events after the 3rd OVA.

(Source: AniDB)