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You can stream One Piece "3D2Y": Overcome Ace's Death! Luffy's Vow to his Friends (2014) on Netflix with a subscription.

The special takes place during the two year before the Straw Hats reunite on Sabody. Luffy is currently in Rusukaina training to get stronger to take on the New World. However the training is interrupted when Hancock's sisters, Marigold and Sandersonia, are kidnapped by the Byrnndi World, a pirate who was locked away on Level 6 of Impel Down but escaped during Luffy's invasion to save Ace, in order to lure Hancock to him and use her as a hostage against the World Government due to her Shichibukai status. Thus Luffy and Hancock head off to confront him and save Hancock's sisters.

This animated special breaks the usual adventure loop by focusing on the quiet, grueling preparation required to survive the New World. Instead of constant battles, you get a focused look at the discipline and growth needed to bridge the gap between childhood dreams and true pirate strength.