Miyake Marie, who plays Tamaki, has had one other major role: Ringo in
Mawaru Penguin Drum. Like Yuuki Aoi and Kayano Ai, she is with the up-and-coming Pro-Fit seiyuu agency. She is 26.
Her grandmother is played by Kubota Tamie, who played a similar role in
Hanasaku Iroha, as the grandmother who ran the inn.
This business of having the first episode previewed a month ahead is unusual but not unique. A few shows have had previews a week or so ahead, but
Hyakka Ryouran and
Working are the only ones I can remember that had previews a whole month ahead. Not a bad idea for generating interest.