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I'm writing my own FAQ for the game, but for those who can read Japanese, there's an awesome blog about this game: http://blog.livedoor.jp/kunio_undokai/
The author gives explanations of each of the different character types, advantages and disadvantages for every special move, and a little detailed character analysis (and, for whatever reason, a list of quotes from the girl's team...). Hopefully they'll keep updating, but I also hope English-writing fans will do their own character analysis, as is the tradition on GameFAQs.
Yeah, I'd like to do that, but the problem is I already have 100% and the game has no 'erase data' feature! There is a Japanese online guide that is trying to figure out the A-rank conditions, so if they ever figure them all out I'll translate it (I don't like to steal too much information though, lol)
Also thanks for the comments, I'll keep making guides so long as people find them useful!