Luffy's Fall! The Unexplored Region - Grand Adventure in the Ocean's Navel

Original title: ONE PIECE ルフィ落下! 秘境・海のヘソの大冒険

Directed by Yukio Kaizawa

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