This is a world with heroes, and the enemies of the heroes are humans who have become monsters due to their own desires. The world calls them - monsters! Monsters destroy everywhere and destroy ordinary humans, while the more powerful groups of humans become heroes and save those

This is a world with heroes, and the enemies of heroes are humans who have become monsters due to their own desires. The world calls them - monsters! The weird people destroy everywhere, destroying ordinary humans, while the more powerful groups of humans become heroes and saving the weak. The protagonist Saitama (bald) is one of them, and he became the strongest hero because of his interest! The strongest hero who no one knows about his strength!

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Saitama was an unemployed job-seeking boy three years ago, and his hair was still very lush. He killed a weirdo who became a crab because he ate too much crab in order to save his child! Although he was killed, he was seriously injured. Since then, Saitama has worked hard to train, and has become bald and stronger!

The twin brothers who attempt to use science and technology to control the world, the elder brother uses the strongest muscle potion he has developed to turn his younger brother into an invincible giant, and can destroy a city's terrible monster with one punch! If the bald head is not there, that's great...