Dansho no Grimm I Haikaburi

is the first volume of the Dansho no Grimm light novel series, written by Gakuto Coda and Illustrated by Mikazuki Kakeru. It was released under the Dengeki Bunko Imprint in April 2006.

Synopsis
Nightmare bubbles mixed with human fear and madness. It sometimes begins to take the form of a "fairy tale," which is a mass of negative "prototypes," and spun out new stories. And what is the story that Aoi and Yukino, who met in a nightmare, follow? An illusionary tale presented by a genius is here!

(source: Bookwalker JP - Translated)