One-Punch Man, Vol. 1: The Secret of Strength

The manga «One-Punch Man» tells the story of Saitama, a hero who can defeat any opponent with a single punch. Despite his incredible strength, Saitama suffers from boredom because he cannot find a worthy rival. The first volume of the series reveals the origin of his power and begins his adventures in a world constantly besieged by various monsters and villains.