Aoi is depressed about not making it to the top of Mt. Fuji. Hinata and Kokona are unsure of how to approach her. How can Aoi recover from such a frustrating defeat?

With Aoi's mother still cautious about her climbing up mountains again, Hinata and her father suggest that she invite her to climb Mount Kirigamine with them. Whilst climbing the mountain, Aoi is reminded of the mountain she climbed with Hinata when they were younger, though neither can remember which mountain it was. Hinata's father later reveals that mountain was Mount Tanigawa, leaving the girls excited to try and climb it once more.

Upon finding an old raincoat in her closet, Kaede recalls her middle school friend, Yuuka, who was often concerned about her climbing mountains. When Yuuka got upset with her after she ended up spraining her leg, Kaede came to realise she had never taken Yuuka's advice to heart and apologised, after which they bought a raincoat together. Feeling nostalgic, Kaede rings up Yuuka and the two go out shopping together.

Aoi is anxious about climbing Mount Tanigawa as it involves riding a cable car, which isn't good for her fear of heights. Later, Kaede invites the girls to her house, where she explains she too was scared whilst riding a cable car, but found it less scary on her second go. As Aoi is encouraged by Kaede's words and decides to take on Tanigawa, Kaede gives her her old raincoat that she bought with Yuuka.

Wanting to help Aoi get over her fear of heights, Hinata takes everyone to Shinrin Park. After participating in various activities, Hinata helps Aoi to cross a suspension bridge before managing to get her to try some bouncy mountains.

Running low on funds for her mountaineering, Aoi applies for a part-time job at a cake shop. There, she meets college sophomore Hikari Onozuka, who shows her the ropes. After a hard day of work, Aoi feels her horizon has expanded a little.

Having made much progress in her preparations for the Mt. Tanigawa trip, it soon dawns on Aoi that she hasn't touched her summer homework. With Hinata on vacation, Aoi asks Kaede to help her out, only to find she hasn't finished any of her homework either. Kaede instead calls in Yuuka to help tutor them over the next week, allowing them to get it done in time.

On the day before the Tanigawa climb, Kokona, whose birthday is on the same day, gets some new shoes as an early present from her mother and decides to go on a walk to Akebano Children's Forest Park to try them out. After returning home, Kokona celebrates her birthday with her mother, who ran a little late home from work. Meanwhile, Aoi, who spent the day making a pound cake, wonders about what will happen after her dream is fulfilled.

The day of the Mount Tanigawa climb finally arrives, with Hinata also pondering what will happen after she and Aoi fulfil their dream. After a series of staircases and some obligatory forms, the girls arrive at Tanigawa, where Aoi must face the cable car first hand. Despite Aoi still being afraid, the other girls help her get through it before Hinata helps her ride a ski lift.

As the girls officially start climbing up the mountain, they encounter a quiet young photographer named Honoka, who had previously helped them by the cable car. Interested in her, Aoi decides to follow Honoka as she goes about her photography. After encountering some rainfall, the girls arrive at the mountain hut, where Aoi and Hinata look back on memories of their previous time there, worrying what happens after their promise is fulfilled.

On the day the Aoi invites Honoka to join her and the others for a fireworks festival, she and Hinata get into another argument with each other. As Aoi takes Honoka on a tour of Hanno, she can't stop thinking about Hinata and decides to try to make up with her, while Hinata hear how Aoi feels about her from Hikari and decides she should apologize too. Both have trouble finding an opportunity to apologize to each other during the festival, but soon find they don't really need to, quickly forgetting why they even fought in the first place.

Finding that she won't be able to take on Mt. Fuji again until next summer, Aoi goes with Hinata and Kaede to look at some hiking shoes. Initially sceptical of their price and heaviness, Aoi finds some shoes she likes and climbs up Mt. Tenran to break them in.

Aoi decides to tackle the Hanno Alps, inevitably finding the experience pretty tough by herself. She is soon joined by Kokona, who accompanies her to Nenogongen to look at the shrines.

Aoi is approached by her classmate Mio and invites her and Hinata to karaoke out alongside her friends Kasumi and Yuri. As Aoi worries about what to sing, Hinata encourages her not to overthink things and become more confident around everyone.

Aoi, Hinata, Kokona, and Honoka go to Lockheart Castle in Gunma, each bringing their own unique cameras to take pictures of everything.

Hearing about "mountain coffee" from Hinata's father, Aoi, feeling provoked by Hinata, becomes determined to try it as well, despite finding coffee bitter in general. After getting some advice from Kaede and Yuka, Aoi goes with Hinata to the Kanhasshu Observation Platform, where she puts her coffee making into practise.

With Aoi busy at her part-time job, Hinata goes on an outing by herself, finding herself lonely without Aoi. During closing time, Aoi manages to use what she learned throughout today to help Kokona's mother buy a cake for her daughter.

Aoi makes plans to go to Gunma with Honoka while Hinata, unable to get in touch with Aoi, ends up making plans to go to Mt. Akagi with Kokona on the same day.

Aoi and Honoka explore Gunma's shrines and go to a hot spring while Hinata and Kokona reach the peak of Mt. Akagi. At the end of the day, Aoi, Hinata, and Kokona ride the same train home, where Hinata becomes jealous of all the time Aoi spent with Honoka.

Aoi’s classmates invite her to hang out at Ikebukuro. She knows Hinata has prior arrangements that day, so she hesitates, but decides to go anyway.

Aoi buys Hinata a gift, but Hinata’s mind seems to be elsewhere. Meanwhile, Kaede makes plans for the gang to climb Mt. Kinpu on an overnight trip.

Hinata hurts her foot, and Aoi decides to stay behind with her while Kokona and Kaede finish the trip to the top of Mt. Kinpu.

It’s November, and Hinata’s birthday is coming up. Aoi tries to choose a gift for her, but nothing seems right.

Aoi once made a promise, but to whom? That person’s name — and the ambition it inspires — is on the tip of her tongue… and on the top of a distant peak!

Mt. Fuji awaits! What will Aoi and her friends see from that legendary summit? The peak is in reach... but will they all make it to the top?