One Punch Man season 1 is one of the best anime series I've ever seen. The concept is unique, as Saitama is so powerful that he defeats his enemies in only one punch, leading him to be bored at how easy the fights are for him. Plus, the jokes were hilarious and so were the characters. If you haven't seen this show yet and are interested in anime, do yourself a favour and watch it. I guarantee you'll enjoy it.