Dorei Maid Princess
English name: Dorei Maid Princess
Genres: Fantasy, Hentai
Type: OVA, Episodes: 4
Aired: May 26, 2007 to May 1, 2009
Studio: Anime Antenna Iinkai
Source: Visual novel
Rating: Rx - Hentai
Synopsis:
Based on the game by Black-Lilith. 

The beloved princess Rotte is arrested by the enemy. To save her life, her childhood friend has to make her a slave within the next month.