A One Piece film made to be shown only at the Tokyo One Piece Tower, released as a companion to a limited-time real-world treasure hunt event run with Takarush Corp. In the event, participants work out the secrets of old documents that Luffy, Usopp and Chopper have uncovered, then search for the nest of a strange creature called the Tongari Ton. The film picks up where that hunt ends. The Straw Hat crew believe a chest hidden in a cave holds the treasure of Tongari Island, but they have been fooled into opening it. Expect action, adventure and comedy with the crew.