At Kōdo Ikusei Senior High School, an elite institution boasting cutting-edge facilities and near-universal university placement or employment rates, students enjoy remarkable freedoms—from hairstyle choices to personal belongings. Yet beneath this seemingly perfect facade lies a harsh reality: superior students receive preferential treatment while others face deliberate marginalization. Kiyotaka Ayanokōji finds himself assigned to D-class, the school's repository for underperforming students, after an unexpectedly poor entrance exam performance. His world transforms upon connecting with classmates Suzune Horikita and Kikyō Kushida, setting him on an unexpected path. Note: While Volume 0 serves as a prequel, readers should complete Year 2 Volume 8 first to avoid major spoilers, explaining its delayed release. Anime adaptations: Season 1 covers Volumes 1-3 and 4.5; Season 2 spans Volumes 4-7 and 7.5; Season 3 encompasses Volumes 8-11 and 11.5.