Distortion: Shikabano Oni no Joou

is a Japanese light novel series written by Keisuke Okada, with illustrations by Haruyuki Morisawa. The series began publication on April 10, 2007 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Kazuma, a high school student, goes back to a horror movie with Rimi, the eldest daughter of three sisters next door, and is attacked by a monster that looks a lot like the "Shiki" that appeared in the movie. Kazuma was seriously injured and Rimi was taken away by a monster ... Six months later, Rimi's younger sister, Masaki, goes missing, and a boy, Yoshito, with a guitar appears in front of Kazuma, who desperately searches for his whereabouts. He summoned a terrifying purgatory angel and told Kazuma to burn a flock of corpses. "Reality is easily distorted and broken. Anything is allowed to exist in a broken reality. Shiki or whatever." It is a parasite "exciter" that distorts reality and embodies nightmares. It was the beginning of the battle ...