Great question — answering as the UphillTech team:
Natsume is divided up into 4 seasons. You can see the rest of them at the bottom of the anime-planet page : It's similar with Anime News Network . But Crunchyroll has them grouped together under one listing (but for some shows, the different seasons are listed within the show's page). They do that with a lot of multi-season shows, perhaps in an effort to make the favorites/queues work easier so you don't have to hunt down different listings for different seasons of the same show.
Full answer by Jon Lin: https://anime.stackexchange.com/a/29501 (CC BY-SA 3.0).
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