Volume 12

"Strong Guys" (強い奴ら, Tsuyoi yatsura) is the twelfth volume of the One-Punch Man manga series.

Summary
A single man arose to face the evil threatening humankind! His name was Saitama. He became a hero for fun!

With one punch he has resolved every crisis so far, but no one believes he could be so extraordinary strong.

Together with his pupil Genos (Class S), Saitama has been active a a hero and risen from Class C to Class B.

One day, a man named Garou shows up. He admires monsters so he begins hero hunting. During a monster outbreak that is wrecking havoc, Garou is fighting metal Bat, when elswhere Fubuki faces the monster known as Do-S.

Meanwhile Saitama has cleared the first round of the martial arts tournament!