A desperate game of anal hunting unfolds at a girls' school. The girls, led by Hikaru Minazuki, tremble at the harsh rule that if they are caught, their anuses will be penetrated without question. The fear of fleeing tightens their anuses even more, and the intense pain and sense of immorality at the time of penetration burn into their brains. This is a brutal work that vividly depicts the innocent cries of the girls and the violation of their forbidden holes.