K SEVEN STORIES: Lost Small World ~Ori no Mukou ni~

Misaki Yata is an energetic youth whose reckless and immature attitude has led him to be shunned by his classmates. Saruhiko Fushimi is a loner whose dysfunctional family, particularity his eccentric father, Niki, has led him to view the world in a pessimistic way. Despite being polar opposites, Yata’s enthusiasm eventually wins Fushimi’s trust, and the two become the best of friends. As time passes on, the two boys grow tired of being trapped inside their small world, leading them to set foot in the turbulent and dangerous world of the Dresden Slate… (Source: AnimeLab)