http://www.natsume.com/games/PrincessDebut/index.html#

New game by Natsume.
I'm not quite sure what to make of it - I haven't played it yet, but on the one hand it looks like there may be some ren'ai-type overtones going on here, albeit a bit childish-looking.
Natsume describes it as "part rhythm game and part adventure game."

I bought Princess Debut a couple weeks ago, and instantly noticed the introduction was an awful lot like an ADV game. The situation was introduced, then the love interests were brought out.

The core gameplay is dancing by using the DS stylus and following along with the action on screen. Unfortunately, I realized almost immediately that I'm terrible at stylus-action games...