Sam, Dean and Castiel were investigating another case. But this time it was not what they had met before. The victims were only male and lacked hearts and livers, which surprised them because they had not yet encountered a demon or ghost that eats hearts and livers.
While Dean and Sam questioned witnesses and examined the scene, Cas began digging through books and the Internet to find out what it could be. Soon the angel found information about what it could be.
This is a Kumiho. He had heard about the Japanese Kitsune and even dealt with it, but he had no idea about the Kumiho.
He didn’t say anything about this to the Winchesters and went himself to the forest where the deaths of the men took place. When he got there, he heard quiet muttering and the sound of branches breaking. He hid behind a tree and began to watch what was happening.
He saw... a fox. Yes. But she was the nine-tails, which made Cas understand that he was on the right path. And at that moment the fox turned into a human. Well, everything was as Castiel had expected, now all he had to do was try not to get caught by the Kumiho.