Board Thread:Questions and Answers/@comment-28019357-20160320235151/@comment-25942629-20160324222532

For the most part, they just minded their own business and did their own thing. Quite a few policed the humans as well since the humans kept messing with dangerous taboo things. Ferid has a history of living with humans in human society, which is highly unusual for a vampire. He was also involved with policing the humans. If you read the first omnibus, which is out in English, you can read about his first encounter with Mahiru and Guren.