Nothing about Saitama passes the superhero test, from his expressionless face to his bald head and average physique. However, this seemingly ordinary guy has an unusual problem - he can't find an opponent strong enough to challenge him! Every time a promising villain appears, he defeats them with a single punch! Can Saitama finally find an opponent who can compete with him and give meaning to his life? Or is he doomed to live a life full of superpower but boredom?