https://www.animenewsnetwork.com.au/n...v-anime/.85713
So One-Punch man is a manga series that has been around for some time. There are two versions, one where the creator himself does the drawings AFAIK (which look terrible compared to the usual standard but have a unique charm to them) and one where the drawing is made by skilled illustrators.
From the article:
I've been following it for a while and it's pretty funny, can only recommend. I'm excited for the anime.The series revolves around the titular super hero who has trained so hard that his hair has fallen out, and who can overcome any enemy with one punch. However, because he is so strong, he has become bored and frustrated with winning all his battles so easily.