Episode 443 - Luffy’s Promise! The Battle for the One Piece Begins

Episode 443
Luffy’s Promise! The Battle for the One Piece Begins
Japanese: ルフィの約束！ワンピースをかけた戦いの始まり
Rufi no Yakusoku! Wan Pīsu o Kaketa Tatakai no Hajimari

The battle with the treasure hunters comes to an end, but the crew learns that the treasure they sought was merely a key to something even greater. The crew must now search for the true treasure, which is said to be the key to unlocking the ultimate power in the Grand Line. This episode shifts the focus from the current treasure to a larger mystery.