Yes, you can learn more about the actual game on the Japanese site here. Where you can buy it is, among other places, here. But, you should probably know in advance: this is a Japanese visual novel - to put it bluntly, it's like reading a 'choose your own adventure' novel, except there are pictures (CG) and sound (voice-overs and music). There's no 3D world or anything, and you don't walk around freely or anything like that - you get choices at certain interval in the story, and that determines what happens next. The PC version also has sex scenes while the PS2 version (Shuffle! On the Stage - info here) doesn't (but you'd need a Japanese PS2 to play it). Both are Japanese only (no English dubs or subs), but a fan-translation project is underway for the PC version. And, incidentally, the two sequels that Rin-sama mentioned (Tick! Tack! and Really? Really!) are both for PC; neither is for PS2.
Anyway, not trying to dissuade you at all, but you need to at least know what you're getting into. Give it a try, and you may find that you like it - but, if you're expecting a game like the ones you normally find on store shelves in North America and Europe (action, RPG, adventure, etc.), this is a different thing entirely.