Kangoku Gakuen ~Gakuen Kounin, Chijoku no Kagai Jugyou~
Original title: 姦獄学園～学園公認、恥辱の課外授業～
There is a boarding school deep in the mountains. The school is well-known as an elite school, but it has another aspect. Yes, it also trains sex slaves.... The main character is Sayaka. She joins the school to earn money for her sickly younger brother. She knows what will happen to her at school, but it is more than her expectation.... Various lessons to be sex slaves.... Well, will she be able to get out of this school or...?