The Japanese tend to love cats, which makes their ancient myths about vampire cats seem curious. For a nation that loves cats so much, their myths also warn about cats sucking the life out of people and taking on their appearances, so maybe the Japanese know that cats can be both good and evil at the same time.
The vampire cat of Japan not only drinks the blood of its victims, but often changes its form from a cat to a human so it can better escape detection. So the next time you see a particularly cruel human, it could be a Japanese vampire cat in disguise.