No, it was a human kingdom. It just happened to be ruled by a very powerful vampire whom they viewed as a god.

[He had once, a long time ago. Watching Brig, smiling at the way he comments on the smithy.

And then he asks about Setsuna.]

Setsuna came into the world Awakened. The people of Yamatai thought that she was a witch. [A beat.] So did our parents.

[His gaze is straying towards one of the walls, where a set of manacles and chains - silver, engraved with runes - still hang. He never bothered having those destroyed. They were reminders.]