We all know that the 6 OAVs were based on Saki HIWATARI's manga, but how much different and alike are they? Unfortunately, I haven't quite read the whole manga, so all I can tell you are little snipplets. But that's not going to stop you, will it? ^_^
So let's compare with Manga Vol. 2 with OAV ep. 2!! Ganbatte yo!