Creator: Kazuma Kamachi
Author of various light novels and manga including A Certain Magical Index, A Certain Scientific Railgun, A Certain Scientific Accelerator, The Circumstances Leading To Waltraute's Marriage, Heavy Object, The Zashiki Warashi Of Intellectual Village, A Simple Survey, A Simple Monitoring, Killer Princess and Deep End, Killer Device and Never End, and The Unexplored Summon://Blood Sign. He also helped work on the anime adaptions of A Certain Magical Index (including its movie Miracle of Endymion) and A Certain Scientific Railgun.
- Massive Multiplayer Crossover: He wrote a light novel that crosses over all his works called The Circumstances Leading to a Certain Magical Heavy Zashiki Warashi’s Simple Killer Princess's Marriage, released on Feb. 10, 2015.
- Milestone Celebration: On April 10, 2014, the tenth anniversary of A Certain Magical Index's debut, his first work, he made ten announcements about his various works, including a Massive Multiplayer Crossover between his various works.
- Reclusive Artist: He's so reclusive that his background and looks are not known to the public. Kiyotaka Haimura (A Certain Magical Index's illustrator) and Yuyuko Takemiya (Toradora!'s author) have met him in person. Kiyotaka only commented that he seems to be a sports-oriented guy, and Yuyuko commented that he's very young-looking.