One Piece: Stampede is a stand-alone film that celebrates the anime’s 20th Anniversary and takes place outside the canon of the “One Piece” TV series. Monkey D. Luffy and his Straw Hat pirate crew are invited to a massive Pirate Festival that brings many of the most iconic characters from throughout the franchise to participate in competition with the Straw Hats to find Roger’s treasure. It also pits the Straw Hats against a new enemy named Bullet, a former member of Roger’s crew.

Kyuta, a boy living in Shibuya, and Kumatetsu, a lonesome beast from Jutengai, an imaginary world. One day, Kyuta forays into the imaginary world and, as he’s looking for his way back, meets Kumatetsu who becomes his spirit guide. That encounter leads them to many adventures.

It is a time of chaos. Earth is no longer what it used to be. It has been infested with a bug like species called the Blue. Yuji Kaido, who has a mysterious disease, is put into suspended animation until a cure is found. When he wakes up Yuji learns that its been more than 20 years since he was put into suspended animation, and the world is now controled by these creatures. He joins a group of soldiers equipped with powerful mechas to fight against the Blue for hope of a better future.