At Shiri Arigatou Private Academy, students follow a caste system, turning into slaves of the school principal as they strive to become Center students. Candidates are required to monitor the menstrual cycles of Center students, and an abnormal custom has taken root where entire classes film candidates having sex during study periods or for entertainment. The candidates are shown enduring various forms of bullying and assault with forced smiles. In the climax, the principal has sex with a candidate—only for a complete reversal of fate to unfold. The student is A●B, and the principal is Ak● Yasu—what will happen next!?