Ever since One Piece saw the Straw Hat's entrance onto the Grand Line, they had been hounded by agents of a mysterious organization. Eventually, however, they found out that one of these agents was the princess of a kingdom called Alabasta, and she was working undercover to infiltrate the organization this whole time. The princess was revealed to be Nefertari Vivi, and she joined the Straw Hat's crew as they helped her reach her kingdom.