A Samurai Who Can Cut Fire! Foxfire Kin'emon!

Vergo, the stranger sent with Monet to keep watch over Caesar Clown, finishes off Trafalgar Law by crushing the heart he holds and clubbing him unconscious with a bamboo rod laced with Haki. Caesar then has his men bind the fallen Straw Hats and the G-5 marines, who watch helplessly. Elsewhere, Chopper slips into the private laboratory hunting for a cure for the drugged children.

Above the lake, Zoro and Brook wait for Sanji, who has dived after the samurai's torso. Using observation Haki, Sanji locates the body inside a shark's mouth, retrieves it, and escapes the spreading gas just in time. Restored to one piece, the samurai names himself Kin'emon, proves his skill by slicing fire and bursting the slimes, and sets off to find his boy Momonosuke. Intrigued by the sword style, Zoro chooses to follow.

Vergo reveals he was planted alongside Monet to oversee Caesar's work, then knocks Law out cold. The captive Straw Hats and G-5 officers are chained on Caesar's orders. Sanji, wearing Nami's body, beats a shark and recovers the missing torso before the poison can claim the water. The reassembled samurai identifies himself as Kin'emon and demonstrates his Foxfire technique, igniting and cutting through the slime to clear an escape. He departs for the lab to rescue his son, and Zoro tags along out of curiosity about the cutting style.

This installment adapts the early pages of Chapter 672 and debuts Kin'emon's Foxfire Style along with the technique Homura Saki. Several beats diverge from the manga: Vergo displays Law's heart during their first clash rather than after the imprisonment, and Brook is gassed only after Zoro tries to slice the Smileys instead of Brook acting first. The anime padded the sequence with Zoro calling Brook grandpa, Kin'emon conjuring a fresh coat for Sanji, Chopper creeping through the lab, and Sanji peeking at Nami's body and refusing to give it back. A continuity slip leaves Nami's shoes on her feet after Sanji removed them to swim.