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A Certain Magical Index is a Japanese light novel series written by Kazuma Kamachi and illustrated by Kiyotaka Haimura.
Ref: https://comicbook.com/anime/news/a-certain-magical-index-creator-gives-update-on-season-3/
The story is set in Academy City, a technologically advanced independent city-state located in the west of Tokyo, Japan known for its educational and research institutions. Toma Kamijo is a student in Academy City whose right hand's power called the Imagine Breaker could negate any supernatural powers but also his luck, much to his chagrin.
One day, Toma meets a young English girl named Index, a nun from Necessarius, a secret magic branch of the Church of England, whose mind had been implanted with the Index Librorum Prohibitorum – 103,000 forbidden magical books the Church stored in secret locations. His encounter with her leads him to meet others from the secret worlds of science and magic. Toma's unusual power places him at the center of conflicts between the Sorcerers and Espers in Academy City who planned to unravel the secrets behind Academy City, Index, and Toma's special power.
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