Hachimitsu Academy, a prestigious, historically all-girls school, has finally become co-ed. Average teen, Kiyoshi, is one of five boys to enroll. What he doesn’t know is that the school is clandestinely ruled by an Underground Student Council of ruthless, cruel, totally hot female students! And when the boys get caught peeping, they’re sent to the school’s prison, which is run by the brutally seductive warden, who also happens to be the VP of the Underground Student Council. After the boys are forced endure manual labor, whips, and chains, they’ll be left wishing they were locked up with actual criminals! Make sure to check back later today, because I still have more for you!!!

[Source: Crunchyroll]

Adaptation of the Mad Max arc of the manga.