In the popular anime series One Piece by author and illustrator Eiichiro Oda, Monkey D. Luffy learned to use Haki while training with former pirate king Gol D. Roger's right-hand man Silvers Rayleigh.

Ever since Luffy got a rude awakening in his fight against Kaido, he has been trying to find a way to fight back successfully. But now the time is fast approaching as Luffy kicks off new training for ...

Luffy and Rayleigh say goodbye to Jinbe and go to Rusukaina Island, where Luffy will be trained under Rayleigh. Rayleigh explains to Luffy about Haki, demonstrates for him on a wild giant elephant.

Monkey D. Luffy is the shonen hero to define all shonen heroes. The star of One Piece meets every requirement asked after an action hero, and it turns out the pirate is planning to up his power levels ...