One Piece Chapter 400 — The Key Hunt Begins - Kind: chapter overview - Chapter: 400 - Characters: Luffy, Fukurou, Zoro, Franky, Nami, Rob Lucci, Sanji, Chopper, Sogeking, Nico Robin ### Summary Each Straw Hat faces a CP9 opponent while the rescue depends on finding the correct key before Robin reaches the Gate of Justice.