Hack and slash games aren't very common nowadays. And apparently for good reason. I can sum up this game in one word.
The game has a fairly unique style. Animé-style characters, realistic-looking world. It's an interesting juxtaposition, but it's purely stylistic. There's nothing deeper to it. And the game goes right for the T&A.
The main character's the classic scantily-clad buxom heroine of any of 37 million other games. The difference is this one wields two gun-blades. Weapons that are theoretically cool, but patently ridiculous when you think about them realistically. I mean, logistically, trying to point those things to shoot is silly. In addition to the dual-gun-blades, you get several skills, and the only reason to buy any of them is because you're forced to in order to exploit the weakness of whatever enemy you're fighting. If your enemy doesn't have a weakness, you can just spam the basic attack until everything's dead. There's not really any reason to get in to more complex maneuvers.
There's no linearity to the game. There's no open-endedness either. Both of those imply at least some form of continuity. Each arena is its own set piece, not linked in any way. You go in, it's closed off, you fight a bunch of stuff, you walk out the arch, it loads a new place to fight.
I just really cannot recommend this game as a purchase. It's amusing enough that you may wanna rent it for a console when you're bored some weekend, but that's about it.