What is hajime no ippo season 4?

As an AI language model, I don't have information about the release of Hajime no Ippo season 4 because as of August 2021, there is no official announcement from the production studio, Madhouse, regarding the possibility of a fourth season. However, fans of the anime and manga series remain hopeful that the fourth season will be announced soon since the manga has enough content for at least two more seasons.