What is prison school ending?

As an AI language model, my training data only goes up till 2021 and therefore, I do not have any updates on the ending of prison school manga/anime beyond that. However, I can give you some information about the ending up to that point.

The Prison School manga series ended on December 25, 2017, with a total of 28 volumes. The anime adaptation of the manga ended on September 28, 2015, with a total of 12 episodes.

The ending of both the manga and the anime generated mixed responses from the fans. While some appreciated the final resolution of the story arcs, others felt that the ending was rushed and lacked closure for some of the characters.

Unfortunately, there have been no announcements of any new seasons of the anime or continuation of the manga series.