Here are some thoughts about the game I have.
Well, you start off with Arnval, completely naked. You have to buy parts for her or else all she'll do is just punch in battle. You control them directly in battle, since this is the near future of Battle Rondo, where the "Shinki Ride System" has been created so the Master and Shinki can fight as one. Overall the game is about the same as Battle Rondo outside of battle, with the lack of the Battery system. Omg I'm so happy about that.
In battle though, you control her directly. You move with D-pad (can change to analog, yay) and you can use your equipped weapons assigned to O, Triangle, and Square. If you don't, she just punches. You can also train, although I haven't tried it yet.
Overall, it's an okay game. Nothing spectacular, but it's okay. If only there wasn't so much DLC... >_>