A Certain Magical Index
Kamachi wrote short novels exclusively for Haimura's three artbook collections. The first short novel, titled "A Certain Magical Index SS: Love Letter Competition", was included in the release of "Kiyotaka Haimura Artbook rainbow spectrum:colors" on February 28, 2011. The second short novel, titled "New Testament: A Certain Magical Index SS", was included in the release of "Kiyotaka Haimura Artbook 2 rainbow spectrum:notes" on September 9, 2014. The third short novel, titled "Genesis Testament: A Certain Magical Index SS", was included in the release of "Kiyotaka Haimura Artbook 3 CROSS" on May 9, 2020.