Have you ever been in Prison? I am pretty sure that some of my readers have actually been there but don't want to be there. Being alone and trapped is not good for our psychological health. I don't know if I could withstand being locked and away from my brother. It would be a nightmare for me if that happens.
The story of Prison School is very different to real life Prison stories. My brother said that being there or enrolled to a school like that will build up your personality. He even added that the Prison School's way to run is the best way to tolerate minimum mistake. Though it may sound bad at all, it indeed polishes a person. I asked my brother if he would really love to be somewhere like a Prison school. He said that he would love to, but his cellmates should be gals not guys like him. LMAO!
A manga that gets adapted into an anime is already a big success. Turning it into a live-action TV series made it more popular. If you're going to ask for a second season then you should stop right now. There is a very high chance that the anime series would have a second installment. A season two is not a problem since the original manga is running on a weekly basis update. With 18 current volumes, there is too much content to cover and those are more than enough for a season sequel.