In his typical fashion, Luffy immediately accepts her, simply stating that she isn't a bad person.
The episode begins with the Straw Hat Pirates making a frantic getaway from the Marines. Despite the heavy pursuit led by Captain Hina, the crew manages to slip away through a clever smokescreen maneuver. As the dust settles and the crew breathes a sigh of relief, they believe they are finally alone on the Going Merry.
Unlike her previous cold demeanor, Robin approaches the crew with a strange request: she wants to join them. She explains that because Luffy forced her to live during the collapse of the Alubarna Royal Mausoleum—when she had already given up on life—he now has the "responsibility" to take her in.