Saitama is a hero who ends any threat with a single punch—and because of that absurd power, combat thrills are gone. He drifts through cheap-apartment days of three meals and naps until mosquito-type freaks, Vaccine Man, and cyborg Genos crash his bored strongest-hero routine. Volume 1 opens the deadpan legend of a man who saves the world without raising his pulse, mixing void and laugh in the same breath.