The team behind the anime for the manga One-Punch Man has announced Sunday at the One Punch Man Fall Festival that the anime will be getting a second season as well as a mobile game coming out next year. A tweet was posted on the 25th of September. Roughly translating to;
“Today 9/25 “Wanpan Autumn Festival” was held for “one punch man,” the second phase of production has been announced. Future information will come from the official site and Twitter. Please look forward for further news”.
— TVアニメ「ワンパンマン」公式 (@opm_anime) September 25, 2016
The first season of One-Punch Man aired in Japan October 2015 and ended in December of the same year. The anime was also streamed outside of Japan as it aired. On July 16th the anime aired an English dub of the anime on Toonami. Now the second season for the anime appears to be in production. No information about when the second season will air in Japan has been released yet.