Koudo Ikusei High School, a top prestigious school with state-of-the-art facilities, where nearly 100% of students graduate go to college or get a job. Students here are free to cut any hairstyle and bring any personal belongings they want. Koudo Ikusei is a heavenly school, but the truth is that only the top students receive this privileged treatment. Protagonist Kiyotaka Ayanokouji is a student in Class D, where the school casts on "lower" students to mock them. For some reason, Kiyotaka was careless in the entrance exam and was placed in Class D. After meeting Suzune Horikita and Kikyou Kushida, two other students in his class, Kiyotaka's situation began to change.