Episode 813 - Luffy's Vow! The Struggle to Safeguard the Pirate Monarch's Crown

Episode 813
Luffy’s Promise! The Battle to Protect the Pirate King’s Throne
Japanese: ルフィの約束！海賊王の座を守るための戦い
Rufi no Yakusoku! Kaizoku-Ō no Za o Mamoru Tame no Tatakai

Luffy and the crew form an alliance with the revolutionaries to take on the World Government’s fleet, leading to an epic battle on the high seas. The revolutionaries reveal that they have been gathering forces to overthrow the oppressive regime. As the battle rages, Luffy learns more about the revolution’s leader, who has a personal connection to the pirate king’s legacy.