Episode 687 - The Ultimate Test! Luffy’s Final Challenge for the Pirate King’s Throne

Episode 687
The Ultimate Test! Luffy’s Final Challenge for the Pirate King’s Throne
Japanese: 究極の試練！ルフィの海賊王の座をかけた最後の挑戦
Kyūkyoku no Shiren! Rufi no Kaizoku-Ō no Za o Kaketa Saigo no Chōsen

The crew sails into treacherous waters where they encounter a powerful pirate fleet. The pirates’ intentions are unclear, but Luffy and the crew must face them head-on to protect their ship and continue their journey. The battle is fierce, and the crew learns more about the pirate fleet's origins and their connection to the Grand Line’s secrets.