Episode 163 - The Epic Buccaneer Quest! Luffy's Vow to His Shipmates

Episode 163
The Great Pirate Adventure! Luffy’s Promise to His Crew
Japanese: 大海賊冒険！ルフィ、仲間たちへの誓い
Dai Kaizoku Bōken! Rufi, Nakama-tachi e no Chikai

After their narrow escape from the island's guardian, the Straw Hat Pirates make their way to a nearby island where they encounter a group of warriors who have been protecting a lost treasure for centuries. The warriors challenge the crew, testing their strength and determination to see if they are worthy of the treasure.