I just finished the demo, lovely.
First when you start the game, you get an sms with tutorial about what's available in the demo. Besides the main story, there is the hostess club, karaoke bar and arcade center to go to. I only tried the hostess mini-game. OMG, that girl talks so much @_@ Blah blah, I used to be a different girl, blah blah, I want to open a shop with cute merchandise for girls, blah. It seems she knows about Kiryu for a long time. Bitch, it was so expensive just to talk with her!
The graphics are gorgeous, though the menu interface is pretty much identical to Kenzan. Not a bad thing, since that is slick too. The voice acting is top-notch. I don't think I have seen much better.
Also, you can learn new special moves by observing people with L3 button. You can unlock 2 in the demo. I got 1 where this girl suddenly kicks a guys ass for harassing her XD
Then the gameplay, what can I say? It's very good. Af first I was buttenbashing my way through, but then learned the finer details.