This time, there's even more of an incentive to get your jig on, since there's a story included that involves overthrowing Satan. So, where exactly does the "action" element come in, then? Basically, you race against your opponents to complete puzzles. You can also attack your opponents, though (and vice versa), and by correctly putting pieces in place you gain stronger attacks.
The game is being developed by Nippon Ichi, makers of such gems like Disgaea. There will even been a Disgaea character, Etna, featured in it. Also, since NIS is furiously localizing games for us English-speakers, there's a chance this one might show up in North America eventually.
If you're curious about this crazy hybrid, you can check out some screenage after the break.