yama no susume
Mountain-climbing themed manga series by Shiro.
The series follows Yukimura Aoi after she has entered high school. She reunites with a childhood friend, Kuraue Hinata, who she hasn't seen since elementary school. Hinata is surprised to see how much Aoi has changed, as Aoi has become the complete opposite of what she was like in elementary school. Aoi had an accident where she broke her leg from falling on the playground, which lead to her changes. Hinata helps to encourage Aoi to rekindle her childhood interest in mountain climbing.