With the conclusion of One Piece's Raid on Onigashima quickly approaching, many anime fans are rushing to catch up with the sea-faring shonen in order to watch its dramatic conclusion. The Straw Hat Pirates and their allies are closer than ever to taking down Kaido's empire; however, for them to emerge victorious, Monkey D. Luffy will need to finally assert himself as one of the Four Emperors of the Sea by defeating the World's Strongest Creature. As alluded to in One Piece Film: Red and seen in the series' manga, this breakthrough will entail Luffy's most powerful transformation to date — Gear 5.
Source：https://www.cbr.com/luffy-gear-5-animation-date/
