Kokudo Ou
English title: Legend of the Black Eye
Japanese title: 黒瞳皇
Alternative titles: Koku Dou Ou: Charmstone, Kokudo Oh
Type: OVA
Source: Visual novel
Episodes: 5
Status: Finished Airing
Aired: Nov 28, 2000 to Jun 18, 2002
Duration: 28 min per ep
Rating: Rx - Hentai
Studios: Alice Production
Producers: Five Ways
Licensors: JapanAnime
Genres: Fantasy, Hentai

Isheildo is a young prince from the small country of Bosarre. Two larger nations that border Bosarre have sent their princesses to stay with Isheildo for one and a half months, hoping to gain more political power by having him marry one of them. Both are desperate for some kind of alliance and have to allow Isheildo one and a half months to decide whether he will marry Bellshil (of the east country of Rohan) or Ariel (of the West country of Gerod). Both princesses are desperate to win him over, and of course, will go to any lengths to ensure that the diplomatic relationship can be formed. 

(Source: ANN)

On March 25, 2008 and April 25, 2008, Strawberry Jam re-released Kokudo Ou under the name Maid Densetsu (メイド伝説～メル&ベルの淫靡な誘い～). (Source: AniDB)