Quick recap
Nami returns to Cocoyasi Village, ruled by the fish-man Arlong. Her past comes out: Arlong killed her adoptive mother, Bell-mère, and forced young Nami to draw maps for him while she saved up to buy the village back. When Marine captain Nezumi, on Arlong's payroll, seizes her savings, Nami breaks down and asks Luffy for help, and he puts his hat on her head. Zoro, Sanji and Usopp beat Arlong's officers, and Luffy brings down Arlong and Arlong Park. Nami joins for good. At the end, Luffy gets his first bounty poster: 30 million berries.