One Piece: A new member?

A girl called Hinamori Amu (Hey! Everyone knows her!!) tell her story when she was going to school, she fell in a hole that lead her to a world that most of the Otakus know... She meet a weird crew and they are calling themselves pirates. Who are they? (I think you guys know already) Should Amu trust them?

Note: I do not own the characters: they are from One Piece and Shugo Chara! .