The Kusonoki family was one of the ancient families that had existed during an era when the supernatural world was still relatively well known to humanity.
Well, it wasn't exactly common knowledge to the point where you could turn on the television and hear about demons or angels on the evening news. However, back in those days, it was much easier for people to learn about the existence of angels, demons, fallen angels, and other supernatural beings. Their existence wasn't as deeply hidden as it was in the present day.
Perhaps that was because those events had taken place a very long time ago. People back then were also much more skilled at recognizing supernatural beings, allowing them to distinguish between humans, demons, and angels without relying entirely on guesswork.
