One-Punch Man. Book 6

While the S-Class hero Steel Bat fights with all his might against the giant Centipede-Elder, the monster-man Garou decides to hunt him down at all costs!

Meanwhile, in various cities, numerous monsters appear out of nowhere.

There is a catastrophic shortage of heroes to fight them, and Saitama is neither here nor there...

Together with martial arts masters, he participates in the Super Battle.

And none of the tournament participants even suspect what battles are taking place outside the stadium...