In the middle of this century the politicians of this country, worried for the declining birth rates, propose a certain law. The "Law against Sexual Misconduct". The content of this law says that "All the sex acts that haven't as purpose the reproduction are forbidden".
It was a law that prohibited the enjoyment, through the contact or the possession, of that sort of things like the pornography and the sex industry.
The name of the person at the center of this law is Tachibana Tadanobu. He has been the first chief executive of this country and, after his retirement, has founded the "Seiren Gakuen", a facility made to isolate those young persons that have violated the law against SM, and he's spending his remaining years of life as its chairman.

A girl that has violated that law is going to be sent to the Seiren Gakuen.
Her name is "Himeno Yuria". She has been arrested by the police and she will be liberated by a female teacher, come as guarantor of her identity, if she accepts to go the Seiren Gakuen.

"Alice", a mysterious maid, introduces herself (?) to Yuria saying that she wants to serve "Himeno Yuria", chosen to attend the Seiren Gakuen's course for young women.
Then there are "Nishina Eri", a boyish girl that she meets in the Gakuen's dormitory, and "Kuryuu Hazuki", the previous president of the students' council.
Every single day they, without being able to rest, are victims of cruel sex abuses of the men and so, adapting themselves to those sex preferences, they decide to kneel in front of the door that brings to an abnormal awakening.