Based on Eiichiro Oda's one-shot manga of the same name, Monsters has been all but confirmed to be a prequel following the same Ryuma from One Piece with a few subtle yet genius changes.

Eiichiro Oda is the amazing mastermind behind the award-winning manga One Piece. He is also one of the most accomplished writers in the Shueisha’s Weekly Shonen Jump magazine. The One Piece series ...