I really don't know. The author might not have made it clear or there could be mixed signals. You might have to analyze the context to determine Hugh's feelings about the cap.
I'm not sure specifically what 'Cap deage' means. It could be a very specific term, a misspelling, or something relatively unknown. It might be a proper name, a local term in a certain area or a very niche concept.
There are cases where schools with zero - tolerance policies have students expelled for bringing something as simple as a pocketknife to school for a legitimate reason like a Scout project. These students, especially if they come from disadvantaged backgrounds, may then be more likely to get involved with the wrong crowd outside of school and end up in the criminal justice system. This is a typical school to prison story.
It's a story mainly set in a prison - like school environment. It often involves the experiences and adventures of the students in this unique setting.
The ending of the School Prison manga is quite unexpected. The main characters manage to overcome their challenges, but there are some loose ends that leave you thinking.