There is a total of 52 episodes of TV series, which is where all the good stuff happens.

2 OVA are released.

First one has 3 episodes.

Second one has 6 episodes which follows the storyline of volume 14-18.

And... a Third OVA is coming out!!! Which follows the two novels "Eternal Light" the story around when Miaka and Tamahome gets married. There are currently 2 episodes out.

The following are the novels information. Please don't ask me where to get them, cause I personally don't know and would like to know also... ^^" sorry.

Fushigi Yuugi Gaiden 1 ~ Genrou Den ~

Book One: The Legend of Genrou ("Phantasm Wolf")

Featuring Genrou (Tasuki), Kouji and Hakurou.
Release date 1998/1/30

Fushigi Yuugi Gaiden 2 ~ Shouryuu Den ~

Book Two: The Legend of Shouryuu ("Rising Dragon")

Featuring Houjun (Chichiri), Kouran, Taiitsukun and Nyan Nyan.
Release date 1998/7/23

Fushigi Yuugi Gaiden 3 ~ Yukiyasha Den ~

Book Three: The Legend of Yukiyasha ("Snow Demoness")

Featuring Kourin (Nuriko).
Release date 1999/2/2

Fushigi Yuugi Gaiden 4 ~ Ryuusei Den ~

Book Four: The Legend of Ryuusei ("Falling Star")

Featuring Kutoku (Amiboshi) and Shunkaku (Suboshi).
Release date 1999/4/23

Fushigi Yuugi Gaiden 5 ~ Suzaku Hi Den ~

Book Five: The Sad Legend of Suzaku

Featuring Saihitei (Hotohori), Kourin (Nuriko) and Houki.
Release date 1999/7/23

Fushigi Yuugi Gaiden 6 ~ Seiran Den ~

Book Six: The Blue Legend

Featuring Nakago, Soi, and Tomo.
Release date 1999/12/1

Fushigi Yuugi Gaiden 7 ~ Eikou Den, Part 1 ~

Book Seven: The Legend of Eikou ("Eternal Light"), Part 1

The continuation of Fushigi Yuugi.
Release date 2000/2/1

Fushigi Yuugi Gaiden 8 ~ Eikou Den, Part 2 ~

Book Eight: The Legend of Eikou ("Eternal Light"), Part 2

Continuing from Book Seven.
Release date 2000/3/1

Fushigi Yuugi Gaiden 9 ~ Shugyoku Den ~

Book Nine: The Legend of Shugyoku ("Scarlet Pearl")

Featuring Tamahome and friends.
Release date 2001/12/21

Fushigi Yuugi Gaiden 10 ~Unmin Den ~

Book Ten: The Legend of Fortune
Release date 2002/3/1