I'm not 100% on the reading of the seiyuu names, but it should be
mostly correct.
In addition to the radio drama and game, there is going to be
a TV series too (probably next year).  AIC already made the OP.
51 girls!

Kira Kira Melody Gakuen [Playstation 2]
 Hamasaki Rikako       :: Akami Yukie
 Makimura Midori       :: Asano Masumi
 Shinjou Chihiro       :: Arama Riasu
 Tachibana Kozue       :: Itou Aya
 Matsunaga Rie         :: Itou Emiko
 Yashiro Setsuko       :: Inokuchi Yuka
 Kimishima Masumi      :: Minano Fuuko
 Soga Ayumi            :: Ohgoshi Tomoe
 Kannazuki Chifuyu     :: Ohtsuka Mae
 Sasamoto Eimi         :: Ogura Maiko
 Nagumo Chikage        :: Obara Mizuku
 Asagi Moe             :: Katou Madoka
 Ishimuro Satsuki      :: Kadowaki Mai
 Kousaka Minami        :: Kamei Asaka
 Haruyama Momo         :: Hinano Mayo
 Kitazawa Shinobu      :: Kimura Ikue
 Arimori Koyuki        :: Kuwakado Sora
 Kuwana Tomoe          :: Kobayashi Kana
 Takenouchi Maya       :: Sakai Rika
 Anna Yoko Martin      :: Satou Chizuko
 Kouzuki Hotaru        :: Sawai Natsumi
 Utsunomiya Kimiko     :: Shibata Shouka
 Teramoto Mika         :: Sakurai Sara
 Minamura Nana         :: Shintani Sayaka
 Ryuugasaki Jun        :: Shindou Yoko
 Houjou Rei            :: Suzuki Michiko
 Chigira Yui           :: Sekine Miyuki
 Kusanagi Suzu         :: Serai Shizuko
 Kuramochi Kyoko       :: Daikoku Yuuka
 Satomi Mao            :: Takase Noriko
 Omikami Shizuka       :: Takahira Jun
 Tsukioka Sakiko       :: Takayama Kanako
 Taki Hiroko           :: Tateishi Mai
 Fuugetsu Kotoko       :: Tanabe Miri
 Kurihara Ayana        :: Tsuchiya Mieko
 Takasaki Shouko       :: Deguchi Motoko
 Nohara Katsumi        :: Doumen Satomi
 Shinohara Aoi         :: Tokunaga Ai
 Shibuya Haruna        :: Toyodome Chikako
 Yoshino Madoka        :: Nagai Nobuko
 Yamaki Ryou           :: Nagano Eriko
 Watarai Shiho         :: Higasayama Tsugumi
 Kikuchi Yuuki         :: Hiroe Mina
 Sahara Noko           :: Furuuchi Rika
 Ogishima Chiaki       :: Furuta Hanae
 Shirasugi Rino        :: Hosokawa Seika
 Ichinose Natsu        :: Matsumoto Chiyomi
 Nitta Hiyori          :: Mamiya Tomoko
 Hokage Erika          :: Misaki Masami
 Ooga Mizuho           :: Mito Yoko
 Morishita Karin       :: Yabuta Naoko

--
Hitoshi Doi                                               Toshi Nibunnoichi
half a UFO catcher doll, half a cel          801 tactical training squadron
http://www.win.ne.jp/~doi/                                    doi@win.ne.jp