I'm not liking this as much as I hoped, but still watching. Aimed just a tad younger than
Yumeiro Patissiere, with clumsier storytelling, and more blatant with the tie-in. ("For idols, these cards are their life." Yeah, right.)
The lead seiyuu, however, is outstanding. Her voice has subtlety and feeling. The seiyuu,
Morohoshi Sumire 諸星すみれ, is only 13 but has a long history in TV drama, dubbing, and anime. She was Lili in
No. 6 and Kurara in
Kuragehime, as well as having acted in over 20 TV dramas and dubbed over 20 foreign TV shows and films. She also has a role this season in
OniAi. Here is
her blog.
When she was nine, and playing Nina Tucker in
FMA2, Paku Romi said that her acting was so good that a shiver ran through the cast at the recording, and it made the adult actors do their best just to equal her. And Kugimiya Rie apparently agreed. (All according to
Japanese Wikipedia, sources given.)
The seiyuu playing Aoi (right) is also pretty good and rather young. She is Tadokoro Azusa 田所あずさ, 18. This is her first named role, but she had a minor role in
NakaImo. She won the HoriPro agency's national audition in 2011, getting a place on their roster and a recording contract with Lantis.
And it's also good to hear Kotobuki Minako as the top idol, Kanzaki Mizuki.
When I first watched the OP, I was very happy to see the good 2D dancing. But the actual 3D dancing in the show looks bad to me, graceless stick-figures.