The story takes place in "Jinghai City", a modern city that is slowly being eroded by "the strange world". 99% Of the citizens, including the protagonist's relatives and friends, are "mimics" disguised as humans - monsters that feed on human negative emotions. The entire city is regarded as a huge "breeding farm", and real humans are "sacrifice" in captivity. The city is bound by invisible rules. Once it is targeted by a mimic or the truth of the world is discovered, it will fall into an endless pursuit.
