With summer vacation coming to an end, the girls are having as much fun as they can with their remaining time. However, their daily shenanigans are cut short when Suguru Koshigaya wins the grand prize of a lottery—tickets to Okinawa! After hasty preparations, the Asahigaoka group embarks on a three-day trip for their final summer getaway. Upon arriving in Okinawa and checking into an inn, the group comes across Aoi Niizato—the young daughter of the inn's hostess. Despite being of similar age, her mature demeanor leaves Natsumi Koshigaya reflecting upon her own childish nature. With the sign of an unexpected friendship blooming on the horizon, the girls waste no time diving into their ambitious sightseeing plans and regional activities!

The carefree journeys of the four girls continue! As their fleeting yet eventful summer becomes a distant memory, the arrival of fall signals a new school year with limitless opportunities. Even as the four girls return to their peaceful routine, the appearance of new faces enlivens the anything but exciting rural life of Asahigaoka. Non Non Biyori Nonstop leisurely walks back into the lives of Hotaru Ichijou, Komari Koshigaya, Natsumi Koshigaya, and Renge Miyauchi as they fully embrace their rural lifestyles and turn anything they find into nothing but fun!

While spending a summer day at the department store, Suguru Koshigaya wins the lottery’s grand prize—four tickets to Okinawa! Filled with awe and excitement, the girls of Asahigaoka do various things to prepare for the trip. From practicing how to ride on an airplane to buying travel essentials at the convenience store, they do everything beforehand so they can enjoy their time in Okinawa to the fullest extent. A departure from the familiar scenery of Asahigaoka is a new experience for Renge Miyauchi, but that does not stop her from pondering how her perspective of the world may change. As the day of the trip draws near, a promise is made.

Life in rural Asahigaoka moves at its own pace. Devoid of the pleasures and worries of a bustling metropolis, this small village might seem painfully dull at first glance. However, despite living this far from her hometown of Tokyo, Hotaru Ichijou manages to find a group of friends whom she can spend quality time with. No matter whether it is winter, spring, summer, or fall, they make full use of everything the nature around them has to offer.