Oh, Blue talks about how the dream stones let him talk to people in other worlds and meet said worlds.
So far he mentions three: a world where succubi consumed all mortals and starvation has turned them more monstruous in mind a body; a world where succubi act like loving, doting mothers and mortals are their pampered children to the point there's no civilization as said mortals don't mature mentally past childhood as the succubi take care of everything; and a world where a man has had many tragic disgraces caused by women, turning him into such a mysoginistic person succubi can't seduce him ( or drain him to death, I can't remember well at the moment), making him the perfect hunter.