Manga Onepunch-Man

Long years of training have allowed Saitama to gain tremendous strength, thanks to which he can defeat any enemy with a single blow. He realizes that he must use this skill for good, so he decides to become a superhero. However, he very quickly got tired of defeating monsters with one blow, so he wants someone to challenge him and help restore the hero's fuse. Cyborg Genos, after seeing the incredible power of Saitama, decided to become his disciples. Saitama himself realizes that he is not receiving recognition because he is not part of the Hero Association. Then he decides to take Genos as an apprentice and together with him overcome the difficult path in order to become a recognized hero and find worthy rivals for them!