The opening starts with the Thousand Sunny sailing down a stretch of the open ocean whilst dodging cannon shots. The Straw Hats then appear in front of the Sunny before dissolving into differently colored rays of lights that shoot up toward the sky. Each of the Straw Hats are shown one by one, doing a different pose before the title logo appears.
It then cuts to Luffy facing Charlotte Katakuri in the Mirro-World, with the two clashing Haki-imbued fists. We then see shots of Jinbe performing a Fish-Man Karate punch, Brook using his soul projection before slashing out with Soul Solid, Nami using her Clima-Tact to bring down several bolts of lightning, and Chopper transforming into Monster Point and blocking Big Mom's sword with his fingers. It cuts to Luffy dodging multiple mochi punches from Katakuri, and the two of them clash giant fists before trading blows to the face.
After this is a shot of Luffy using Kenbunshoku Haki to foresee Katakuri's attacks, which is followed by a scene of the Vinsmoke Family members using their signature abilities. We then cut back to the Mirro-World, where after Katakuri removes his scarf (revealing his face starting Episode 857), Luffy activates his Snakeman form (though he's silhouetted until Episode 871). Then, a series of shots consisting of Zoro performing an attack, Sanji and his team completing the wedding cake, Usopp and Franky fighting Marines, Charlotte Flampe and her minions in the Mirro-World, Robinsubduing a group of attackers, and Charlotte Oven and his army on Cacao Island guarding the last mirror. Big Mom then appears (her face in shadow until Episode 864), Prometheus igniting her hair as she raises Napoleon to attack. Luffy then appears in front of her before jumping forward as the other Straw Hats appear with him.