Marineford

(Although I haven't finished my other book, I couldn't stop thinking about this story :p)

Shin (aka y/n) makes and appearance in marineford, "War of the best" as an alliance of Monkey D. Luffy

Not only does she change the tide of the battle but, Sengoku reveals who she really is and how she's related to Luffy and Ace

Not only because of her background but because of her strength and characteristic she catches the attention of Mihawk 'the strongest swordsman', but is he really the strongest?

Disclaimer: (I don't own one piece nor the characters from one piece, all credits to Oda)
(This story is fan made) (I will change some parts of the story 'One Piece', once again this is fan made)