Episode 3 closes out the Romance Dawn Arc as Luffy and Zoro topple the corrupt Marine captain Morgan. Koby enlists with the Marines, Zoro commits to the crew, and a thieving girl named Nami is glimpsed setting her sights on Buggy.
Luffy hands the katana back to Zoro, who frees himself and turns the Marines' assault aside, pledging to join the crew if he lives. Even as Luffy's rubber body and Zoro's three blades clearly outmatch them, Morgan commands his troops to keep fighting and wades in himself, his arm capped by an axe head. When Helmeppo seizes Koby and threatens to shoot, Luffy is briefly distracted, and Morgan tries a sneak attack from behind. Luffy decks Helmeppo while Zoro cuts Morgan down before he can land the blow.
The Marines, long aware of Morgan's abuses, refuse to keep fighting and instead arrest and discharge their own captain. Over a celebratory meal, Koby lays out the geography of the world, divided east and west by the Red Line, with the Grand Line cutting across it as the sea where Gold Roger hid his treasure at the far end. Ripper, the new base commander, accepts Koby into the Marines but orders the two pirates out of town, promising only to keep quiet to headquarters. Meanwhile, a girl rifles through the base for a Grand Line map and learns the pirate Buggy already took it, so she sets sail after him.
Several manga details shift in adaptation: Ririka becomes a bartender rather than hosting a meal at home, and Morgan's order for protesting men to kill themselves is dropped. The episode debuts the classic To Be Continued card that replaces the earlier Continued screen, and silhouettes of the Gomu Gomu and Bara Bara fruits appear during the Devil Fruit explanation. It is the final installment of the Romance Dawn Arc.

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Yes, Morgan is a villain in this episode of One Piece, a corrupt Marine captain whose abuses are well known to his own troops, and Luffy and Zoro defeat him to end his tyranny over the town.
The mysterious girl mentioned in this episode's title is revealed to be Nami, who is shown rifling through the Marine base for a Grand Line map before setting sail after the pirate Buggy, who already has it.
The fight ends when Zoro cuts down Morgan just before he can land a sneak attack on Luffy, while Luffy knocks out Helmeppo, and the Marines then arrest and discharge their own corrupt captain.
Koby enlists with the Marines in this episode, accepted by the new base commander Ripper, who agrees to keep quiet about the pirates in exchange for their departure.
Koby explains that the world is divided into east and west by the Red Line, with the Grand Line cutting across it as the sea where Gold Roger hid his treasure at its far end.
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