Zetsuboukei Tojirareta Sekai

, is a Japanese light novel series written by Nagaru Tanigawa, with illustrations by G. Munyo. The series began publication on April 10, 2005 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
There are too many tired things in this world. For example, it's August but it's really cool. People who didn't remember calling suddenly came to the room. No matter what they say, they won't go out. Or maybe a familiar girl I've known since childhood is a serial killer. -That's why the unusual and absurd seven-day story sent by "Kitsuki" begins ... An experimental work presented by a genius, the ban has been lifted.