Okay, so a while ago, Mike1984 and I had this discussion where we were thinking of making our own game, after I had accidentally sparked a debate (which wasn't the intent of my topic at the time) on Christianity, but that part is off-topic. Anyway, so Mike and I had this discussion, and we agreed I should share info on what the game was about and what features you guys would like to see. This game itself is going to be an RPG, for starters, though that's as far as I've determined so far.
As far as story goes, one year after the events of Fate/stay Night (you choose which route in-game), peace has returned to Fuyuki, though that's about to change with the arrival of an army of aliens from another part of the galaxy, led by the strongest beings of their planets... in other words, an army of Type worshipers from the planets Aquarius, Pisces, Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, and Ofis (sounds like Office, but it's the Greek for snake), led by their appropriate Types.
Of course, this is not the planet they're supposed to invade, and definitely not the events of Notes. Therefore, Gaia doesn't want these aliens on its planet whatsoever, and wants someone to kick them off. That's where Shirou and Sakura come in, first off. Alaya contacts them and tells them that they're two of the heroes needed to kick the Types off the planet, and by defeating the armies under each Type, and then the Type leading them, they will be able to give Gaia a chance at a breather, which is what humanity needs anyway.
Still, there's a good reason why the story even exists... it's not like a standard shounen manga (compare with Bleach and its story arcs as an example), the story evolves over time with different mechanics for telling the story. The rescue someone in trouble mechanic... doubt that will be used much.
Anyway, enough for now... anything you guys would like to see in this RPG? Tell us, and we'll put it in when given the chance.