Toaru Majutsu no Index is a Japanese light novel series written by Kazuma Kamachi, featuring a world where magic and science coexist. The story follows Touma Kamijou, a student in Academy City, who encounters Index, a young nun with a vast collection of forbidden magical knowledge stored in her mind. This encounter leads Touma into a series of adventures involving magic, science, and hidden conspiracies. The series blends action, fantasy, and science fiction elements.