At the One Punch Man Fall Festival event, the cast of ONE’s One Punch Man announced that a second season of the anime has been green lit and is in production! The official Japanese website for One Punch Man also updated with the announcement as well. The second season has been rumored for quite some time and some websites have even gone as far as to make clickbait posts in an effort to capitalize on those rumors. Despite those efforts, nothing official had been said until now.
While the announcement was made about a second season, no further details were given as to when the season will debut. Despite this, it was also announced at the festival that One Punch Man will be receiving mobile game for smartphones sometime next year. The fact that a game for the anime is releasing next year, it is a safe bet that the second season will also air sometime during 2017 as well.
MyAnimeList.net described the story of One Punch Man as follows:
The seemingly ordinary and unimpressive Saitama has a rather unique hobby: being a hero. In order to pursue his childhood dream, he trained relentlessly for three years—and lost all of his hair in the process. Now, Saitama is incredibly powerful, so much so that no enemy is able to defeat him in battle. In fact, all it takes to defeat evildoers with just one punch has led to an unexpected problem—he is no longer able to enjoy the thrill of battling and has become quite bored.
This all changes with the arrival of Genos, a 19-year-old cyborg, who wishes to be Saitama’s disciple after seeing what he is capable of. Genos proposes that the two join the Hero Association in order to become certified heroes that will be recognized for their positive contributions to society, and Saitama, shocked that no one knows who he is, quickly agrees. And thus begins the story of One Punch Man, an action-comedy that follows an eccentric individual who longs to fight strong enemies that can hopefully give him the excitement he once felt and just maybe, he’ll become popular in the process.
The first season wrapped up with the Boros arc and featured 12 episodes running from October to December 2015. VIZ Media holds the license for North American manga distribution while Adult Swim has aired the anime in English here in the United States on their Toonami block which started back in July of 2016.