In the advanced Academy City of Japan, where most residents are students honing their psychic powers, Touma Kamijou stands out with his unique ability to nullify supernatural skills using 'Imagine Breaker.' Despite his ordinary life, everything changes when he encounters Index Librorum Prohibitorum, a girl targeted by a dangerous group for her forbidden knowledge. As Kamijou protects Index from sinister forces, he delves into a mysterious world of magic and danger, challenging his perception of the supernatural.