The world in which super villains and monsters have become a reality, and being a superhero is a completely ordinary profession for people with special abilities. The city has become so accustomed to such phenomena that another hero can easily get lost in the crowd. Especially since a guy named Saitama can\'t make pompous speeches, advertise himself, and his appearance is quite unremarkable. The short, completely bald hero quickly becomes a local celebrity, because he only needs one punch to take down any monster. Saitama was just an ordinary person who also lost his job. Deciding what to do and where to find a new job, he decides to become a superhero. But during his training, he became Onepunchman, a man capable of defeating any enemy with a single blow. Superhero feats were a boring routine until another hero appeared who could become a worthy opponent for the all-powerful Saitama.