Luffyundefineds Fall! The Unexplored Region - Grand Adventure in the Oceanundefineds Navel

The Straw Hat Pirates stumble upon an enormous hole in the ocean, at the bottom of which lies a mysterious island known as the "Oceanundefineds Navel". The Straw Hat Pirates resolve to find the islandundefineds treasure, which can supposedly grant any wish, but the islandundefineds inhabitants possess agendas of their own for their new guests...