In Gannibal, police officer Agawa Daigo becomes Chuzai (residential police) at the Kyokamura village with his wife and daughter. The latter refuses to speak but is healthy. This new job comes about after the previous Chuzai disappears very suddenly and mysteriously.
Now, Agawa Daigo (Yûya Yagira) is both tasked with being the Chuzai of Kyokamura and trying to solve the case of his missing predecessor. During this process, he very quickly stumbles upon the horrifying truth about the village.