Devil Summoner: Soul Hackers Nightmare of the Butterfly (デビルサマナー ソウルハッカーズ―Nightmare of the Butterfly) is a Soul Hackers novelization.
Written by Shinya Kasai, this light novel was published by ASCII's Famitsu Bunko imprint in April 1999. It follows the story of the original game closely without major deviation, although some events are shortened. It is 254 pages long.
The protagonist is named Keiji Minegishi (峰岸啓自) in this work and uses the codename Cage (ケージ).