I read it !
The series started in the year 2003 and is ongoing,
Yuu Watase had different projects after that Manga
There are 9 manga-books actually, but it´s not going on very fast.....*sigh*
In Germany the series is stopped
There is no Genbu Kaiden Anime but you can see two of the Genbuseishis in the original anime "Fushigi Yuugi"