I can't decide on a single favorite, so I'll put up a list:
Little Busters
Fate/Stay Night
Clannad
Tsukihime
Katawa Shoujo
Kanon
Hakuouki
Not that I'm really interested, personally, but you might wanna include the info of WHICH Hakuouki you are talking about, since there are more than one of them:
http://vndb.org/v/all?sq=Hakuouki
