In a world plagued by cursed spirits born from negative human emotions, young jujutsu sorcerers train to exorcise them and protect society. Aiko Shirogane, a scrawny teenager with piercing red eyes and long flowing hair, attends Tokyo Jujutsu High. Orphaned after a curse devoured her family, she awakened her innate technique: 'Crimson Bind,' which summons red threads to restrain and purify spirits. Despite her frail build and timid nature, Aiko's determination grows with each mission, uncovering secrets about her clan's forgotten legacy. She navigates school life, friendships, and deadly encounters, seeking strength to prevent others' suffering.