Wicked City

Renzaburô Taki (Leon Lai Ming) is a human cop who has spent years policing a quiet truce between Earth and the Black World, a parallel universe of demons. He is paired with Windy (Michele Reis), a demon, and told to guard a diplomat whose signature could renew the treaty. Peter Mak sends radical demons after that diplomat, and if the treaty ends, the Earth goes with it.