This is out all over the net but yesterday Sony Japan put up a downloadable Japanese demo of our game from the official game site. It requires the latest 2.70 version of the PSP firmware which you can download from your respective PSP sites. (USA, Japan, Europe) Simple English instructions for installing it are here.
Note: I'm only reporting info that is publicly available. I am unfortunately not officially speaking for Sony here but I wanted to get the word out a demo is available. I hope you enjoy it