As a child, Monkey D. Luffy dreamed of becoming King of the Pirates. But his life changed when he accidentally gained the power to stretch like rubber...at the cost of never being able to swim again Years, later, Luffy sets off in search of the "One Piece," said to be the greatest treasure in the world...

As Luffy and the Straw Hats battle it out with the Doflamingo family, we flash back to the childhood of Trafalgar Law. What made him the man he is today, and what is the cause of the grudge he bears against Doflamingo?