According to the caste system, the students aim to be the center, and the school turned into a slave of the school principal = private thank you school.Candidate students must know the menstrual cycle of center students.A center that proposes SEX photography of candidates in class for self-study time and killing time.Candidates who accept numerous bullying acts with a smile.At the end, the head of the school and the cadets have sex... In the middle of this, all the reversal plays begin.Student = A B, Principal = Aki Ko! ?