Obeying unknown physical laws, two parallel universes overlapped each other. This is how fangs came to the human world of the 21st century. Humanity was faced with strong, dexterous and fast predators with excellent longevity and capable of giving people a lot. The Fangs became acquainted with technological progress, which they had not previously paid the slightest attention to. Both races turned out to be equal in strength, and only the rationality of the leaders on both sides did not lead to senseless mutual destruction. However, not everything is as simple as it seems. Twenty years after the conflict generated by the merger, police captain Kirill Agarev is forced to protect the Fangs from his fellow tribesmen and catch a maniac without knowing for sure what race he belongs to.