Pendulum Era

Twelve years old, one punch weighs 743 kilograms. He didn't know where this strength came from. It's like not knowing what happened before you were seven years old. He lived like a wild animal for five years in the wilderness. Then he squeezed through a crack. Within the barrier, take the martial arts test, become a warrior, and then become a pendulum man. Find the legendary pendulum world and save all mankind!