Genre: Horror, Mystery, Supernatural, Thriller, Seinen
Written by: Yukito Ayatsuji
Illustrated by: Hiro Kiyohara
Published by: Kadokawa Shoten
English Publisher: Yen Press
Magazine: Young Ace
Year: April 3, 2010 – December 3, 2011
The story focuses on a boy named Kōichi Sakakibara. Who, upon transferring into Yomiyama Middle School and meeting the curious Mei Misaki. He finds himself in a mystery revolving around students and people related to his class falling victim to gruesome, senseless deaths.