Kazuma Kamachi (Author) Kazuma Kamachi is a Japanese light novel author and creator of the massively popular series, A Certain Magical Index, its sequel, A Certain Magical Index: New Testament, and a manga adaptation, as well as two spin-off manga series, A Certain Scientific Railgun and A Certain Scientific Accelerator. Chuya Kogino (Author) Chuya Kogino is the artist for the manga adaptation of the smash hit light novel series, A Certain Magical Index.