One Piece Vol 1 by Eiichiro Oda

A new shonen sensation in Japan, this series features Monkey D. Luffy, whose main ambition is to become a pirate. Eating the Gum-Gum Fruit gives him strange powers but also invokes the fruit's curse: anybody who consumes it can never learn to swim. Nevertheless, Monkey and his crewmate Roronoa Zoro, master of the three-sword fighting style, sail the Seven Seas of swashbuckling adventure in search of the elusive treasure "One Piece."