One Piece, Vol. 31 (Shonen Jump Manga)

As a child, Monkey D. Luffy dreamed of becoming King of the Pirates. But his life changed when he accidentally gained the power to stretch like rubber...at the cost of never being able to swim again! Years, later, Luffy sets off in search of the "One Piece," said to be the greatest treasure in the world...

When Mont Blanc Noland reached the shores of ancient Jaya, his teachings of modern science only fueled the distrust the Shandians had toward outsiders. But if they follow his advice in order to save their dying tribe, they'll have to sacrifice everything they hold sacred!