In 2025, 152 years after magic essence flooded the world and shattered the old world, Ayanokouji Kiyotaka enrolls in Advanced Nurturing High School; an elite academy on an artificial island where essence users train to become society's future leaders. Assigned to Class D alongside students labeled as "defective," Kiyotaka keeps his head down, claiming only a weak void affinity and minimal combat ability. His classmates struggle with their own flaws: Horikita Suzune's superiority complex, Sudou Ken's poor emotional control, Kushida Kikyou's hidden darkness. But in a school where strength determines everything and essence beasts lurk in the island's wilderness, staying unnoticed may prove harder than anticipated.