The Secret of Enma! The Cursed Sword Entrusted to Zoro

As Enma keeps siphoning his strength mid-fight against King, Zoro digs into recollections of an old man he once knew on the seacoast. Those scattered clues assemble into the understanding required to truly command the sword rather than be consumed by it.

Zoro reclaims two swords and trades blows with King, who unleashes Barizodon, but the instant Zoro grabs Enma it withers his arm. Falling, he remembers the battle cry Sunacchi he taught Momonosuke and the old man who lingered by the shore in his East Blue village thirteen years prior. That man, who warned of a coming Marine invasion, gifted young Zoro two practice blades and explained that every sword has a temper a swordsman must tame, and that a cursed sword is simply a fine one the weak fear. He recalled forging his masterwork, a blade that chilled whoever held it, which he named the great king of hell. Zoro realizes this was Enma. Outside, Momonosuke discovers he can steer Kaidou's flame clouds as a fellow dragon. Linking the village's Shimotsuki name to the smith Kozaburo, Zoro deduces the old man was Kozaburo himself and that Enma was merely testing its chosen wielder. Recalling his pact with Kuina before her fatal fall, he stops resisting and lets Enma drain him, conquering the blade and erupting with Supreme King Haki that fells nearby Beasts Pirates.

Shimotsuki Kozaburo debuts and King premieres Barizodon. The adaptation adds Momonosuke learning to steer the flame clouds, Apoo, Drake, Inbi, and Zanki fighting CP0, a visual of Zoro's heart as he stabilizes the Haki drain, and his Haki rendered green on first use. It extends King knocking Zoro into the shed, Momonosuke pulling the island clear, the flashback, and Zoro downing the pirates, while omitting a close-up of that effect. A Wano Country arc entry.