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Synopsis

A seemingly ordinary man named Saitama pursues a lifelong ambition by dedicating himself to rigorous training, a regimen that leaves him hairless but grants him overwhelming strength. His power lets him vanquish opponents with a single blow, yet this absolute dominance robs him of the exhilaration of combat and leads to deep boredom. When a 19-year-old cyborg named Genos recognizes Saitama's ability and requests to study under him, the two decide to enlist in the Hero Association to obtain formal recognition for their deeds. As certified heroes, they encounter allies and adversaries, and Saitama seeks to rekindle the excitement of battle that training once promised.