Rabbit Doubt has swept through Tokyo. In this mobile survival game, players are grouped together as "rabbits" and tasked with hunting down the "wolf" hidden among them. If the rabbits fail to identify their enigmatic predator, the wolf will eliminate one of them each turn until the entire colony is wiped out. Players often meet in person, which is exactly what Yuu Aikawa does when he encounters Rei Hazama, Haruka Akechi, and Eiji Hoshi. Along with Yuu's longtime friend, Mitsuki Houyama, the group decides to spend their time at a lively karaoke bar. During their festivities, Yuu leaves to check on one of his intoxicated friends but is suddenly knocked unconscious by an unknown figure wearing a misshapen rabbit mask. After regaining consciousness, he finds himself in an abandoned psychiatric hospital, sharing a cell with a mysterious boy. Although the two soon manage to locate the others, their reunion is interrupted by a spine-chilling message on a cellphone: "Rabbit Doubt, Start!" In Doubt, six high school students are thrust into a life-or-death survival game that will test their integrity and trust. With their lives at stake, they must quickly uncover the identity of the wolf that has infiltrated their group—or be hunted down like prey.