I recently heard that something happened to Yuu Watase, and she is taking a temporairly break. I'm not sure if this is true, but if you know a website that has manga chapters to the following mangas, please do tell.
Fushigi Yuugi: A Mysterious Play
Fushigi Yuugi: Genbu Kaiden
Tsubasa: RESERvoir Chronicle
Full Moon wo Sagashite