One Piece, Volume 28 : Wyper the Berserker

The Straw Hat pirates embark on a plan to become superrich. They just have to find the hidden treasure in El Dorado, the lost city of gold, and then make a getaway on their ship. But unknown terrors lurk around every corner of this island paradise known as Skypiea, including a tyrant named Eneru who enjoys making a game of death!