No wonder the character design is eerily familiar, it's by Enami Katsumi! (Baccano, and for a little easter egg concerning Satellite, she is the also the character designer of Macross Ride
)
Mains are:
Kudan Seishirou (/sob @ uncommon name):
Miyano Mamoru
Takano Sumisogi:
Endou Aya
Other confirmed (Don't know who the characters they represent, but I can guess from the respective seiyuus...
)
八神拓海 (Yagami Takumi?):
Ishida Akira (Easy one here, the bishie-looking on the bottom right from official site)
宇佐美洵:
Kaji Yuuki (My guess, shot-- I mean, girly looking character)
東剛弘:
Ookawa Tohru (Last guy on the back)
笹原七瀬:
Nabatame Hitomi (Girl no. 2, obviously)
Others (unconfirmed characters--okay the last three is already known, but too tired): Sawashiro Miyuki, Ogata Megumi, Toyosaki Aki, Hoshino Takanori (... Admittedly, I didn't know wth is he
), Fukuyama Jun, Nakai Kazuya, Yamaguchi Kappei, Okiayu Ryuutarou, Mugihito (Mugihito Amachi) and Noto Mamiko.
All star casts, without doubt. Yes I went nuts with Miyukicchi, Nakai and Ishida in one pack. Dammit.