Doubt, also known as Rabbit Doubt, is a Japanese manga series written and illustrated by Yoshiki Tonogai. The series focuses on the "Rabbit Doubt" cell phone game, with rules similar to Mafia. The players must find the wolf, or killer, amongst their group of rabbits as they are picked off one-by-one. Six players of this game find themselves trapped in a building with one of the group already dead; to avoid the same fate, the remaining five must play a real-life game of "Rabbit Doubt" and find the wolf (liar) hiding among them. The manga was serialized in Square Enix's shōnen manga magazine Monthly Shōnen Gangan from July 2007 to February 2009, with its chapters collected in four tankōbon volumes. The series continued with two sequels: Judge, published from January 2010 to August 2012, and Secret, published from October 2013 to February 2015. Source: Wikipedia (en)