
But he is saved by Buzz who catches him and allows Luffy to finally catch his straw hat. At first it seems he will fall before catching it. With the gate broken due to this action, water floods the base forcing the Straw Hats, Schneider and Buzz onto the Thousand Sunny while Luffy shrinks and continues to fly after the straw hat. The Marine Commanding Officer throws the hat into the sea when he sees Luffy coming for him, only for Luffy to go Gear 3rd and punch one of the giants into the gate he standing on, the debris of the mace the giant was holding crashing into the Marine captain. The giants once more attack the group but are felled thanks to their teamwork.

Schneider runs to Buzz and apologizes for trying to keep him away. They crash into the base and the Straw Hats regroup. Just as they are about to be squashed, Thousand Sunny flies in, piloted by Schneider who calls out to Buzz. Luffy and Zoro fight valiantly but are knocked down. Luffy tries to get his hat back but is hindered by the base's three giants. Before the Marines can capture Luffy, Zoro arrives to save him. The commander of the base reveals himself and mocks Luffy by holding his straw hat on the barrel of the gun then shooting it gaining Luffy's anger. Before it can go any further, they are suddenly caught in a seastone cage and trapped. Meanwhile Luffy and Buzz's fight sends them crashing into a Marine base. Chopper goes to follow but notices a fork on the ground. Schneider suddenly springs to life at this news and runs to the deck of the ship, commanding the Sunny to go after his friend. Chopper realizes the bird they are chasing is in fact Buzz and informs Schneider that the ship that he is on is that of Luffy's. If Buzz succeeded he could stay with Schneider. Schneider continues citing that in order to keep Buzz away from seeing him die, he came up with an impossible task: steal the straw hat of Monkey D. Luffy finds this out first hand when he catches up to Buzz, first in his dog form then in his hybrid form. Luffy manages to chase it into a volcanic region while Chopper manages to revive Schneider who tells the reindeer doctor of wanting to see his only companion, his dog Buzz who ate the Tori Tori no Mi Model: Eagle. All the while Luffy uses his powers to personally chase after the bird. The chase leads them through some glaciers, through a Marine blockade, into a cave, off a waterfall and into a nest of sea kings. Franky orders the crew back to the Sunny as they continue to follow after the bird. In the midst of the chase a Marine ship appears behind them. Usopp alerts the others which instantly revives the waterlogged Luffy who orders the crew after it. They take him back to the Shark Submerge III to get him treated on the Sunny but just as they are about to leave, a giant bird lands on the ship with Luffy's straw hat in its beak. Chopper spots a ship in the ocean and he and Usopp board it, finding Schneider passed out from coughing up blood. Usopp and Chopper are in the Shark Submerge III, Sanji, Robin, and Brook are in the Mini Merry II, and Nami is on the Shiro Mokuba I while Franky steers the Sunny. They all go out to search the ocean for it. It is possible that, according to Usopp, the bird is a possible culprit.

Soon the rest of the crew is called for an emergency meeting about the missing hat, with Usopp adding that he saw a bird flying away from the ship that night. He almost drowns himself when he thinks the hat has fallen into the ocean prompting Zoro to save him. The next day, Luffy cannot find his prized straw hat and searches the ship frantically for it. As he is coming back to his room he notices the door open and a bird flying overhead but does not pay it any mind. Most of the Straw Hats are sleeping, save for Zoro, who is training, and Usopp, who wakes up to use the restroom. The scene then goes to the Thousand Sunny as it sails the Grand Line at night. Schneider tries to part with the dog as he finds that he is coughing up blood, which he takes to mean that he is dying and does not want his loyal companion to watch him die before his eyes.

The film opens with Schneider and his dog Buzz walking through a town one night. When a bird was spotted holding onto Luffy's hat, the crew began to give chase and have to overcome obstacles such as the unexpected Marines and Sea Kings. Meanwhile, while exploring a ship that seemed to be empty, Usopp and Chopper happened to find a pirate who was sick and decided to treat him back on the Thousand Sunny.

The entire Straw Hat crew began to search for Luffy's important straw hat after he wakes up to find it missing.
