The final villain ends up cockteasing Saitama ' s lust for battle . I . E . , he cracks one of his fingers or something , elating Saitama . And then just stops fighting back , causing Saitama to get really pissed , causing him to accidentally destroy an entire city . Startled , Saitama stops fighting , causing the villain to legitimately injure Saitama i . e . ripping off an arm or something . Then Saitama kills him using an Ultra Serious Series move . Then it turns out this was all an illusion , or rather , an alternate reality given a taste to him . Saitama has the choice to make it so his opponent can actually gain this power , or to just keep being a bored hero . He chooses the latter , realizing he ' s better off as is , than someone desperate for powerful opponents , because he ' d rather not be an angsty bastard or that he ' d rather be a strong hero than a thrilled hero because it ' s a lot of trouble . Saitama ends up finding fulfillment in a rather menial job somehow , and gets some kind of hobby that works out better than the hero business .