What is prison school manga?

Prison School is a Japanese manga series written and illustrated by Akira Hiramoto. It was serialized in Kodansha's Weekly Young Magazine from 2011 to 2017 and was later compiled into 28 volumes. The story follows five boys who are the first male students to attend Hachimitsu Academy, an elite all-girls boarding school. However, they soon find themselves imprisoned in the school's underground prison after being caught peeping on the girls.

The manga is known for its explicit content, dark humor, and themes of friendship, loyalty, and perseverance. It has been praised for its unique storyline and well-developed characters. Prison School has also been adapted into an anime series, as well as a live-action television drama and film. Despite its controversial subject matter, the manga has gained a large following and has been well-received by readers and critics alike.