One Punch Man Manga Chapter 20.5

One Punch Man manga episode 20.5 is a brief episode on Saitama’s past. From it one gets the revelation that Saitama is a character who used to be a regular guy so much that he worked at a convenience store. He was dissatisfied with his conditions and chose become a hero. He trained for three years and became very powerful man to the extent that anyone he would strike be defeated instantly.