The anime home page lists the cast as Siegel Clyne did on post #5. In that order. Yuumi (Koshimizu Ami) listed first. No male
seiyuu listed at all. The cast looks outstanding. The director looks outstanding.
This fall, Kawasumi Ayako stars in
Mokke and
Shion no Ou, and is also in
Genshiken 2. She'll be busy enough.