i recently started playign the VN, its preeetty good so far. the cell-phone system is particularly interestign as it allows the game to get interestign conversations with characters that arent even in the scene, therefore saving a lot of space while developign the less plot-important character traits of the lot, and the stuff oyu can actually get from that (songs and pics they send you) gives oyu soemthign to play around with and a sense of realistically to the whole thing. very unique idea.
the anime is godly of course too.
the main difference between okarin in the anime and okarin in the original is that in the anime, its pretty obviosu eaely on that the whole hoouin kyouma and organization-acting is a personae okarin built and he is aware its not true; in the VN, its harder to tell wether he actually takes his delusions seriously or not, especially at the beginning.