Rin never was a very good person and she can lie much better than Usopp and Luffy.
She had think up of an explanation for how she got here. The explanation came with a backstory so she should be able to answer most of the questions people might ask. The backstory that she created is...
She is cursed with the ability to see visions of a certain someone (Luffy) and people around that certain someone. She can see the future and the past of that certain someone and people around that certain someone, however She can't choose what She wants to see... Because of this curse she was chase out of her hometown. Her hometown is an island covered in a hallucinating fog which causes people to get lost and forgotten they ever go there but people usually will always get out of the fog, without reaching the island of course. An injection was given to everyone in her hometown at a suitable age to get immunity against the hallucinating fog. The people in her hometown are not bad people, She know there must a reason as to why they chased her out of the island.
Her backstory is pretty much the truth twisted around in a way people didn't expect. This way if she accidentally talk about the future she can explain how without saying anything about the One Piece anime.
When she finished making the backstory for herself she realized she already arrived at the village. There's a window besides her and she's surprised by how she look. She have a normal face with a mole under her right eye, the same face she have in her previous world but her mid length hair is coloured dark purple which kinda made her stands out a little.
She always wanted to dye her hair dark purple but now she doesn't have to.
Rin went to Makino's bar called Party's Bar. She went inside when a man suddenly block her and said"This isn't a place for kids, where's your parents."
Rin knew he said it because she look like a child that is probably lost or something but she can't help but feel a little annoyed by how she is treated like a kid.
"You said this isn't a place for kids so what's THAT sitting there??"Rin said while pointing to Luffy who is talking to Makino.
"He's a special case."said the man.
"And I don't care, I choose where I wanna eat."Rin said firmly while staring at him without wavering.
After that guy saw Rin's stubbornness he let her go."It might dangerous here so be careful."says the guy.
"I will."She say with a slight smile on her face.
She went and sit a few seats away from Luffy because she doesn't want Luffy to know who she is yet.
"What's a little girl doing in a place like this?"ask Makino to Rin.
"I got wash ashore a little farther from here." She answer because she don't want her to ask lots of questions.
"Oh my!You must be hungry! I'll give you some food." Makino says in a worried tone.
"Ah! I still have money to pay for the meal it'll make me feel guilty if I eat for free."Rin said to make sure Makino let her pay for the meal.
"Then I'll put a discount for you, so what would you like to eat?"Makino said in a caring but stern voice.
"O-okay,fried fish with veggies I guess..."for some reason she don't think she can fight her in this talk so she'll just accept it.
"Hey!!!"a voice suddenly calling out to Rin.
When she look at the direction of the voice, she realized it was Luffy.
'Damn it your not suppose to call out to me.' she said in her mind.She ignored Luffy's calls a few times before he gets off of his seat and sat down beside her.
'Why are you soo stupid Luffy' she said in her mind angrily. She tried to hide most of her face with her hand as naturally as possible.
"Here's the food." finally Makino came back with Rin's food."Luffy don't disturb the little girl!"Makino scolded Luffy. Rin felt a little guilty since she kinda cause Makino to scold Luffy.
"Thank you for the meal, how much does it cost."Rin ask Makino.
"Just a few berries is enough."Makino answers with a caring voice.
"Okay!" Rin answered, she thought she should act more like a kid for now.