Tập 171 - Trận Chiến Cuối Cùng Bắt Đầu! Lời Thách Thức Của Luffy Với Hải Tặc

Episode 171
The Final Battle Begins! Luffy’s Challenge to the Pirates
Japanese: 最後の戦い開始！ルフィ、海賊たちへの挑戦
Saigo no Tatakai Kaishi! Rufi, Kaizoku-tachi e no Chōsen

On this island, the Straw Hats discover a hidden civilization that has been living in isolation for centuries. The inhabitants of the island possess knowledge about the Void Century and the One Piece, but they are unwilling to share it with outsiders. Luffy and the crew must convince the islanders to reveal what they know.