
The Earth-Black World Peace Treaty, which established a parallel reality free of demons, is soon to expire. A diplomat who is to assist in the securing of another treaty is assigned to the protection of two police officers, Maki, a female demon, and Taki, a male human. The only thing that can rescue Earth from annihilation is the friendship that develops between the two cops, as a radical group of demons from the Black World is plotting to kill the diplomat and stop the pact.