In a world overrun by both superheroes and supervillains exists a quiet man named Saitama. He doesn't look like much at first, with his boring looks, bald head, and non-chalant personality. He mostly busies himself with supermarket sales and TV programs. However, when a supervillain attacks his city, Saitama is able to destroy them with just one punch, and finds himself looking for a villain that can actually put up a fight against him. Saitama ends up attracting the attention of a young cyborg superhero named Genos, and a wide range of supervillains that don't know what to make of Saitama or his strange powers.
Viz Media along with Daisuki as a collaboration will be streaming the anime series. 
- Viz Media and Neon Alley