監獄学園 [Purizun Sukūru] [Prison School] #18

This is the 18th collected volume of the manga series Prison School (監獄学園), published by Kōdansha under their Yanmaga KC Special imprint. It continues the story of the male students at the formerly all-girls Hachimitsu Academy as they navigate the absurd and often risqué consequences of their ongoing battles with the school's disciplinary committee.