This is the arc were Luffy Leaves the Island and and travels to Shells Town and meets Captain Morgan, the leader of the corrupt marine corp ruling the village by fear. Luffy soon hears that there is a person that people have been calling the demon. He is known as Roronoa Zolo. He uses a sword style were he fights with one sword in each hand and one sword in his mouth. Zolo had soon been arrested by the marines because he killed Helmeppos (Captain Morgans lilly livered sons) dog because he was protecting a little girl. Once Luffy hears about this, he wants Zolo to join his pirate crew. Long story short, Luffy trespasses into the marines fortress and sets Zolo free. But before Luffy can get out with Zolo Captain Morgan Stops them and trys to get in a fight. Another long story short, Luffy beats the crap out of Morgan and Zolo joins Luffys crew.