So far it's onlyavailable on the Japanese App Store. And as promised, the game is free. Optional in-game transactions, however, cost a wee bit of Yen, anywhere from 85 Yen ($1.03) to 800 Yen ($9.75).
The game is compatible with iPhone, iPod touch, and iPad (iOS 4.1 or later required). No word on an English release yet, so grab yourself a Japanese iTunes Account in the meantime.So yeah, feel free to leave impressions in the comments (try keep it civil!).