Responses

I watched the anime then immediately read the manga from the start. It's mostly true but not completely. Sasada isn't in the manga after a certain point (anime kept her) and while I haven't watched the previous seasons for some time (before the new ones), I remember that some scenes of the manga are different to the anime. I personally like the manga more than the anime. The manga is a bit funnier. The anime is pretty accurate though. If you ever want to re-read the manga, I recommend from the beginning.
Finally! I caught up! I'm one of those people who started off watching Natsume Yuujinchou when it first aired, and have kept up to date with the anime. So I haven't read from the very beginning, but from around chapter 60(?)