In the tenth volume of One-Punch Man, titled Pumped Up, the excitement continues as the hero hunter Gato ramps up his attack. In response, the ever-unconcerned Saitama decides it's the ideal moment to enter a combat tournament. As the battles intensify, the Class-S hero Metal Bat embarks on a mission to protect a Hero Association executive and his son. But it doesn't take long for trouble to find them, setting the stage for a series of events that will keep readers on the edge of their seats.

An emergency summons gathers Class S heroes at headquarters...and Saitama tags along. There, they learn that the great seer Shibabawa left the following prophecy: “The Earth is in danger!” What in the world is going to happen?! -- VIZ Media