One time, right after the kingdom was isolated from the outside. Eureka called for Karen and Mamoru. With only the three of them, she had instructed them of something that initially found outrageous.
"We shall build an underground where all the people can leave," was her words. At first the two of them were perplexed. If she meant that all the people currently residing in the kingdom. Then that means, more than a million.
But how are they going to create such a place? Under Aurora Kingdom? Indeed in the surface it was large enough to hold all these people but if they create an underground one, they will create a whole with the same size as the kingdom. But how will the ground hold the surface then?
