Encouragement of Climb

is a manga by Shiro. It had been adapted into TV anime, with the first season being a 12-episode TV series produced by Earth Star Entertainment and animated by 8-bit (Infinite Stratos) and each episode last about 5 minutes. There will also be another season of anime releasing in summer of 2014 and that will last for 10-15 around minutes every episodes.

Plot
The title tells the story of the childhood friends Aoi, a girl who prefers staying inside and who has acrophobia, and Hinata, a girl who loves mountains. The two decide to climb a mountain in order to once again see the morning sun from its peak as they did when they were young.

Official
http://www.yamanosusume.com/