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The original Japanese webcomic created by an author using the pseudonym One, which began publication in early 2009, translated into English.
The story takes place in the fictional Japanese metropolis of City Z. The world is full of strange monsters that mysteriously appear and cause disasters. Saitama, the protagonist, is the strongest hero, who easily defeats the monsters or other villains with a single punch. However, due to his overwhelming strength, Saitama has become bored with his power and is constantly trying to find stronger opponents who can present a challenge to him.