In a world plagued by malevolent curses born from human negativity, Yumi Sato discovered her innate cursed energy at age 12 when a curse killed her parents. Recruited by Jujutsu High, she trains to become a sorcerer, wielding a unique technique that manipulates shadows to ensnare enemies. Despite the dangers, Yumi remains optimistic, forming bonds with classmates while honing her skills to exorcise curses and protect the innocent.