One Piece Special: Open Upon the Great Sea! A Father's Huge, HUGE Dream!

The story begins with Pirate Zap's crew, Bonnie and Max, trying to escape from their ship but facing financial difficulties. They're overheard by three captives, including Amanda, who's familiar with the world of treasure hunting thanks to her father's expertise. Amanda proposes a deal: if Bonnie and Max help her and her siblings escape, they can take any treasure they want. The group succeeds in their escape and meets Luffy's crew on a small island, but they're soon pursued by the Bayan Pirates.