>>2103436It's one of those mobile phone CCGs that combines all the gameplay depth of a Facebook game with all the shameless pay-to-winness of a CCG (or, well, a Facebook game) And no, it's just about impossible to play outside Japan. You can technically log in and play, but 90% of the gameplay is locked out until you link your account to a working Japanese mobile phone number (this is mainly to discourage mule accounts and only incidentally to keep the foreign devils out)
If you love Koume, though, you can buy her CD when it comes out.