1-3) Osoba de Misasete!
4-5) Ten ni Todoku Shiro
Both of Yuki’s important childhood friends love the mountains and are in the mountaineering club, but after the older Chihiro confessed to him, the friendship among these three starts to collapse.
6) Osoba de Misasete! Extra
For 4-5 look under Ten ni Todoku Shiro