A girl named Rin Shima comes to a campsite in Lake Motosu, facing opposite Mount Fuji, to spend the day camping. While setting up a campfire, Rin notices a peculiar girl sleeping by the public restroom. Later that night, Rin once again comes across the girl, later introducing as Nadeshiko Kagamihara, who had gotten tired from bicycling toward the area after just moving to a new house, and shares her curry noodles with her before they both get a clear view of Mount Fuji. After eventually managing to get her sister to pick her up, Nadeshiko leaves Rin with her phone number in the hopes of camping with her once again. A few days later, Nadeshiko begins attending her new school, which Rin also attends.

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Room Camp: Chiaki Ōgaki and Aoi Inuyama discuss about a tent with a heating system, but Chiaki ends up describing a kotatsu.

Nadeshiko pays a visit to her school's Outdoor Activities Club, consisting of its members Chiaki and Aoi. The girls attempt to put together a cheap tent only for it to break on them. They are helped out by Rin's friend Ena Saitō, who draws Nadeshiko's attention towards the fact Rin also attends her school. Later, as Rin goes on another solo camping trip to Asagiri Plateau, Nadeshiko, having been informed about the trip by Ena, goes over with some hotpot ingredients.

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Room Camp: To celebrate Nadeshiko joining the Outdoor Activities Club, Chiaki treats her and Aoi with kikyō shingen mochi, during which she teaches them on how to eat it.

While Nadeshiko makes gyoza hotpot for Rin, Chiaki gets a job at a liquor store to fund the club. After enjoying the meal, Rin apologizes for being cold towards Nadeshiko when she invited her to join the club and promises to camp again with her sometime. After spending the night in her sister's car, Nadeshiko wakes up early to watch the sunrise over Mount Fuji.

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Room Camp: Aoi suggests Nadeshiko to try climbing Mount Fuji due to her love with the mountain while Chiaki dubs her "Fujiko".

While planning for their first camping trip together, the Outdoor Activities Club experiments with cost-effective ways to make their sleeping bags more effective in cold weather before ultimately deciding to buy some sleeping bags online. Meanwhile, Rin gets her motorcycle license and goes on a solo camping trip in Nagano Prefecture. As the club members hike through Fuefuki, stopping at a cafe and hot springs resort along the way, they are sent a live security camera feed of Rin on the highway.

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Room Camp: The members of Outdoor Activities Club practice different camping practices.

The club members take a nice relaxing dip in the hot springs, almost succumbing to the urge to eat before they reach their campsite. Meanwhile, Rin arrives at the Takabotchi Highlands and is overcome by a desire to go to a hot spring too, only to discover the nearest one has closed down. A dejected Rin decides to climb up the peak, where she is rewarded with a lovely view, before finding a spot to cook some pasta. The club members finally arrive at their campsite, where Nadeshiko makes curry for everyone. While the others are asleep, Nadeshiko goes to take a picture of the city lights to send to Rin, who goes to the summit of Mount Takabotchi to send her a similar view in return.

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Room Camp: Nadeshiko plans to cover the wall of the Outdoor Activities Club room with photos of their camping.

Rin opens a package to find a mini-grill, which she dreams of using to cook various meats while talking with Ena. Nadeshiko overhears their conversation and suggests a camping trip to try the grill. The two visit a supermarket to buy meat but are forced to settle for substitutes as their desired items were not available. While there, they meet Aoi, who is working as a cashier, and tell her of their plans. Meanwhile, Chiaki is visiting Lake Shibire when she encounters a man grilling steak in a skillet, who offers her part of it. Rin and Nadeshiko are driven by the latter's sister to the lake.

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Room Camp: Nadeshiko and Chiaki discuss why there are many soba udon restaurants at a certain mountain when Aoi tells a tall tale about its history.

At Lake Shibire, Rin and Nadeshiko set up their tents as the latter worries about the myth of a ghost in the lake, while Rin's mother calls the man who had offered Chiaki the steak, revealing him as Rin's grandfather. Rin struggles to ignite the coals in the mini-grill, so Nadeshiko visits a nearby camp for advice. She meets a pair of siblings, one of whom is drunk; the other offers input and new coal for use. After cooking the meat, the two head back to the siblings' campground to give them plates of food as thanks, receiving jambalaya in return. That evening, Rin leaves her tent and encounters a silhouette of a beastly creature, prompting her to run off. As it turns out, the still-inebriated sister had stumbled upon their campsite.

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Room Camp: Chiaki plans to hold a massive recruitment for their club to have their room be upgraded and asks Nadeshiko and Aoi to draw a mascot to attract attention.

Chiaki shows off a wooden bowl and skillet set to Aoi, which she learns must have the lacquer finish removed to place hot food inside and be seasoned, respectively. As they work on this, Ena visits and the three talk about their new substitute teacher and camping after exams. Nadeshiko, Chiaki, and Aoi later visit an outdoor sporting goods store in Minobu, where Nadeshiko declares her intention to get a job to buy a gas lantern.

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Room Camp: Rin finds Nadeshiko in a panoramic map.

Nadeshiko plans to go camping with Rin, but she catches a cold the night before and has to stay at home. As such, Rin decides to go on her own to a campsite at Kamīna and attempts to take a detour to get there, but she later finds out that the road is closed. After meeting some mountain climbers, she lets Nadeshiko and Chiaki decide where she goes next and visits a temple and a hot spring before eating at a restaurant and oversleeping. Meanwhile, Chiaki visits Nadeshiko at home and cooks hōtō for her family.

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Room Camp: Ena finds a sleeping Rin and styles her hair into a pagoda.

Rin oversleeps and is rushing to her campsite when she encounters a roadblock. Upon being told by Chiaki that it may have been left there and never moved, she proceeds and reaches the site, where she struggles to set up due to the windy conditions. Nadeshiko, Chiaki, and Aoi plan their Christmas camping trip and invite Rin, who initially refuses before being convinced by Ena to accept. Minami Toba, the new teacher, is unintentionally lured into becoming the Outdoor Activities Club advisor and is invited to the Christmas camp. Upon hearing Ms. Toba mention bringing beer along, Nadeshiko realizes she was the drunk sister from the Lake Shibire trip.

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Room Camp: Chiaki tells Nadeshiko that their and Aoi's surnames are names of the cities found in Gifu Prefecture, but Aoi refutes due to the city that is similar to her surname is found in Aichi Prefecture.

Chiaki and Aoi check in at the Asagiri Plateau campsite while Ms. Toba sets up her grill and starts drinking. While the two eat at a nearby restaurant, Rin prepares her tent and Nadeshiko shows up shortly after. The four purchase firewood and return to Ms. Toba's table, where she has fallen asleep as Ena and her pet dog Chikuwa arrive. The campers and Chikuwa spend the afternoon playing frisbee with other kids before going their separate ways. At night, Aoi cooks sukiyaki for the group. When their stove runs out of gas, Rin leaves to buy more. She remembers Ena's comments about how fun a group camping trip would be, to which she smiles.

Nadeshiko tells the group what she expects them to be like in ten years when Rin returns. After bathing, the campers enjoy various movies and shows on a tablet Chiaki had brought along until they decide to call it a night. Under the stars, Rin and Nadeshiko talk about their plans for the new year before going to sleep. The next morning, the two cook breakfast and watch the sunrise behind Mount Fuji. Rin returns to her job at a bookstore, while Nadeshiko continues pondering about getting one of her own to afford camping equipment. Ena texts her about a job opportunity delivering New Year's cards, which she accepts. In the epilogue, Nadeshiko returns to Lake Motosu to solo camp when she receives a message from Rin, who also happens to be doing the same. Nadeshiko proposes sending photos of their respective campsites to one another; after seeing herself in Rin's picture, she turns around and realizes they will be camping at the same location.

Chiaki and Aoi are examining their cluttered clubroom when the latter presents a camping magazine. The two balk at the equipment's high prices so Chiaki proposes using standard gear from home, though Aoi notes her ideas are impractical or illegal. Aoi finds three metal poles and ties them together to create a tripod grill, which convinces Chiaki to improvise camping gear with other spare items in the clubroom. However, her plan falls apart when they agree it makes them look like hobos, and they settle for buying a cheap tent online.

While Nadeshiko is reading a magazine, Chiaki and Aoi discuss camping customs in other countries. Aoi briefly leaves before coming back but catches Nadeshiko's suspicion as she is smaller; the real Aoi returns shortly after and reveals the doppelgänger is her younger sister Akari. When Nadeshiko notices Akari's Mount Fuji keychain, the latter and Aoi warn her of an impending war between the Shizuoka and Yamanashi prefectures over who has the better view of the mountain, scaring Nadeshiko. Chiaki chides Nadeshiko for her gullibility when Akari shows up dressed as Rin; although Nadeshiko successfully sees through her ploy, she falls for her older sister Sakura doing the same.

During a plane flight to Australia, turbulence causes Chiaki to panic and jump out with her friends in tow, with the five parachuting onto a deserted island. After establishing a base camp, they struggle to find food and are forced to share a cup of ramen. The next day, the five's luck increases when Chiaki discovers a wealth of bananas and Rin catches a large fish. Although they enjoy themselves, Nadeshiko and Chiaki realize they spent too much time camping on the island over trying to escape, prompting them to run to a cliff and call for help.