Hayou no Tsurugi: Shikkoku no Mashou
Japanese title: 破妖の剣 漆黒の魔性
Alternative titles: Hayo no Ken, Hayou no Tsurugi: Shikkoku no Mashou
Type: OVA
Source: Light novel
Episodes: 2
Status: Finished Airing
Aired: Nov 27, 1992 to Dec 25, 1992
Duration: 30 min per ep
Rating: R - 17+ (violence & profanity)
Studios: Magic Bus
Genres: Fantasy, Supernatural
Demographics: Shoujo

A resident of the Floating Castle that battle demon beings, the girl Rasutel (Rasu), chosen by the willful lady, the Demon-Breaker sword, is sent on a quest to save a princess kidnapped by a Youki. Her quest is helped by a mysterious Youki called Anshu (but he has basic color that usual Youkis do not have.... hehe!). She is also hampered in her quest by her demon-being oriented younger brother who seeks her golden eyes, the heritage of their father, the Golden Youshu. 

(Source: AniDB)