Monkey D. Luffy first met Nami during the Orange Town arc in the One Piece series. At that time, Nami was trying to steal a treasure map from the pirate Buggy. She initially tricked Luffy by joining his crew as their navigator but later betrayed him and ran away with the treasure they had accumulated. Her motive was to reclaim her hometown, Cocoyashi Village, from the control of the pirate Arlong and his gang
. Despite her betrayal, when Luffy learned the truth about Nami's situation and her forced alliance with Arlong, he decided to help her. Luffy saved Nami's village from Arlong's tyranny, which led to Nami officially joining the Straw Hat Pirates as their navigator. This marked the beginning of a strong friendship and bond between Luffy and Nami, based on trust and mutual support rather than romance
. In summary, Luffy met Nami when she was involved in stealing a treasure map from Buggy, and after understanding her plight, he helped her and her village, leading to her joining his crew.