One flame, one meeting

SPOILER ALERT
White, a 17-year-old girl also called the devil's wife, is a feared pirate from the new world who has been captured and taken to Impel Down: the largest and most guarded prison in the world; no one has ever entered, no one has ever left. She is already intent on escaping but in here she will meet someone she will become attached to and instead of escaping and returning to her former life she will save this person.