Toaru Majutsu no Index

In a world where science enables supernatural abilities and religion supports magic, Touma Kamijou is a high school student with poor grades and a unique ability known as Imagine Breaker. This power can nullify any other supernatural force, but it also affects Kamijou's fortune. Because of its strength, he is classified at the supernatural level of 0. One day, a girl in white appears at his window, claiming to be pursued by sorcerers. She is a nun from the Church of England whose memories have been altered by the 103,000 forbidden texts of the Church, known as Index-Librorum-Prohibitorum.