It seems that after 2 seasons, two OVAs and a film that Non Non Biyori isn’t done.
The show is a simple slice of life that focus on country life. How country are we talking? The local elementary and middle school combined has a total of 5 kids. and the nearest book store is 20 minutes away if you have a bicycle. The first season focus on a new student to the school that’s from the big city adjusting to country life. Below is what Anime News Network had to say about the first season.
Asahioka Branch School, a combined elementary and middle school in an isolated village, has only five students total, four girls and one boy. The girls are best friends, and pass the season with traditional activities like harvesting mountain herbs and fishing.Anime News Network