Plum summary: In a world much like our own, fruit stacking has become the world’s most popular sport…and a young boy named Plum will become that sport's most beloved underdog. Plum’s journey begins at the gates of Apple Seed City, the living, breathing home of the beloved sport itself. Will he succeed? Can he overcome the odds? The answers can be found up in clouds, as our hero begins his quest to stack higher than anyone before him.