Fujimi Shobo published the original novel in 20 volumes between 1994 and 2003, featuring illustrations by Yuuya Kusaka. Akita also penned a 13-volume side story novel titled Majutsushi Orphen: Mubou-hen alongside the main series from 1996 to 2003. Kadokawa published the two-volume Majutsushi Orphen: Mawari Michi short story in 1997-1998.
TO Books published a ten-volume sequel novel series between 2011 and 2015. The company has since reprinted the original novel and the Mubou-hen side story novel in ten and seven volumes, respectively. Akita launched a prequel novel on January 19, the second volume of which went on sale on April 1 (pictured).