Mayor Guo of Wanhe City was seeking re-election but got kidnapped a few days before election day by a young man from the poor and seriously polluted area of the city. It was a scheme plotted by a local petrochemical company hoping to ensure Guo’s victory in the election so that their expansion application could be approve. However, this false kidnapping goes wrong, and soon everything is out of control.

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When a spirit medium is called to exorcise a demon from a possessed man, he is unknowingly captured in the act by two students looking to document the process. When the students accidentally release the devil fish demon into the world, it is up to them and the spirit medium to send it back to the hellish world from where it came.