In the hallowed halls of Tokyo Koudo Ikusei Senior High School, where academic excellence and future success are the norm, Kiyotaka Ayanokoji finds himself relegated to Class 1-D, a gathering of the institution's most problematic students. Despite the school's lofty reputation and the promise of a bright future for its graduates, the reality within its walls is far from idyllic. A ruthless ranking system divides the student body into four distinct classes, with only those in the upper echelons receiving the privileges and resources befitting their station. Class D, where Kiyotaka and his classmates find themselves, is the dumping ground for the school's least promising pupils, a place where hope and ambition are scarce commodities. Yet, in this cutthroat environment, where sabotage and self-interest are the order of the day, Kiyotaka discovers unlikely allies in the form of Suzune Horikita, a girl who believes her placement in Class D is a mistake and is determined to ascend to the top, and Kikyou Kushida, the class idol whose friendly demeanor belies her true motives. Together, they must navigate the treacherous waters of Koudo Ikusei Senior High School, where the only way to survive is to outwit and outperform their peers. With no holds barred and the stakes higher than ever, Kiyotaka and his classmates embark on a journey to prove their worth and rise above the limitations imposed upon them by a system designed to ridicule and suppress those it deems inferior.