"One Piece 3D Gekisō! Trap Coaster" is a short anime film that blends the adventurous spirit of the "One Piece" franchise with a unique 3D presentation. The narrative centers on the Straw Hat Pirates—Luffy, Zoro, Nami, Usopp, Sanji, Chopper, Robin, Franky, and Brook—as they embark on a thrilling ride aboard a mysterious trap-filled roller coaster. The story begins with the crew discovering an abandoned amusement park on a remote island. Intrigued by the promise of treasure, they board a roller coaster that quickly becomes a perilous journey filled with traps and challenges.

The roller coaster ride serves as the primary setting, with each segment of the track presenting new obstacles. These include mechanical enemies, environmental hazards, and puzzles that test the crew's teamwork and individual abilities. Luffy's determination and leadership are highlighted as he motivates his crew to push forward despite the dangers. Zoro and Sanji showcase their combat skills, while Nami and Robin use their intelligence to solve intricate puzzles. Usopp and Chopper provide comic relief and moments of bravery, and Franky and Brook contribute their unique talents to overcome the coaster's traps.

The antagonist of the story is a mysterious figure who controls the amusement park and its deadly attractions. This character, revealed to be a former amusement park owner with a grudge against pirates, seeks to eliminate the Straw Hats by luring them into the trap coaster. The crew must navigate the coaster's final, most dangerous segment to confront this foe and escape the park alive. The film concludes with the Straw Hats triumphing over the antagonist and continuing their journey, having narrowly avoided disaster.

The narrative is fast-paced, emphasizing action and camaraderie, and stays true to the adventurous tone of the "One Piece" series. While the story is self-contained, it captures the essence of the franchise, focusing on the Straw Hat Pirates' resilience and bond as they face seemingly insurmountable odds.