The Banished Angel(One Piece Fan Fic)

Seirei is a girl with amnesia. Luffy found her while she was drifting in the sea and invited her over at the Thousand Sunny. This bubbly girl holds a tragic past, loosing people, loosing freedom, and loosing comfort with loneliness. No one can't withstand being alone, so she did what was expected, self harm. She also held a responsibility that held the lives of many people, in which she became a Crusader.
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"Momma, Papa, what's freedom?"

"It's something a person can achieve when you are ready to sacrifice one for another."

"So... Does that mean we are not free?"
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One Piece doesn't belong to me. Takes place after 2 years. And after mermaid/fishman Island. Summary may be confusing so sorry.
Book 1