Iris no Niji

is a Japanese light novel series written by Takafumi Nanatsuki, with illustrations by Katsuyaki Hirano. The series began publication on December 10, 2005 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
An ordinary high school student, Shogo Karasaki, encounters a scene where the winged monster "Harpy" "eats" people. It was the mysterious beautiful girl, Nagisa Irishu, who called herself "a ally of justice" who saved Shogo, who was desperate. Shogo, who was told by Nagisa that the disappeared people were eaten "information" instead of being killed, acted together as a decoy to recover the "existence information" of his friend who had been erased. To do. Nagisa's smile, which is not lost even in the days of fighting-but Shogo discovers the sad secret hidden there ... What is the fate of the boy involved in the battle between the "information-eating monster" Harpy and the girl who can see the "whisper" of information?