Five male students enrolls at a school that has all female students. The boarding school was formerly an all-girls high school until the new school year. The student council then places the five male students in a place known as the prison on charges that they were peeping on the girls in the showers. The 5 male students struggle to escape from the prison. Adapted from the manga series "Prison School" (監獄学園) by Hiramoto Akira (平本アキラ).