For anyone interested in trying out Sega's new mobile game Kotodaman (the one in which Ryo Hazuki has a cameo), the Dojo's own James Brown has written up an awesome guide on Phantom River Stone explaining how to do so if you live outside the Japan region for iPhone & iPad users. There's a separate guide for Android users.
Step-by-step guide to downloading Kotodaman outside Japan:
Now the game is in Japanese only, but even if you can't read it you should be able to tap your way through a few screens and enjoy sampling the music & animations!