Collectibles, iPhone Cases and more from the anime One Punch Man. One Punch Man is one of the most popular, if not the most popular, anime/manga of 2015. The series revolves around a hero who, after going through rigorous training, has incredible strength and durability. The series follows that hero on his adventures as he fights against supervillains trying to take over the world. One punch man cases have been a huge hit with fans and you can now purchase One Punch Man Phone Cases from our One Punch Man Shop.