Also known as: アナザー, Another
A 2009 mystery-horror novel by Ayatsuji Yukito, published by Kadokawa Shoten. Also adapted into a 2010-2012 manga, with illustrations by Kiyohara Hiro, serialized in Kadokawa Shoten's Young Ace, a 2012 live-action film, and 2012 anime by P.A. Works.