GOOD NEWS! hitomi is doing a collaboration with Taiji All Stars. I don't know this artist at all and never heard of them either, but anything with hitomi is very much welcomed! I'm very looking forward to this!
I think the title of the single is called "Tengoku on Uta feat. hitomi/A Blessing Soul feat. Yasuko Matsuyuki".
http://www.cdjapan.co.jp/detailview.html?KEY=FLCG-7002