Fushigi Yuugi is a fantasy series created by Watase Yuu. The TV series ran from 1995 to 1996. There's also a manga, two OAVs, and a couple Music Crips. The second OAV is entitled Fushigi Yuugi Gaiden. The TV series and OAVs are released in the US by Pioneer Anime.
Fushigi Yuugi is a story about two school girls, Miaka and Yui. While visiting the National Library in Japan, Miaka and Yui start to read an old book called "Four Gods Earth and Sky." The book transports them back into ancient China where they are wrapped up in the legends of that time which fortells of the legendary Suzako no Miko (Suzako's Priestess) who, with her seven seishi (constellations) saves Konan Country from invading forces.