In the end , Urara , the children 's aunt , becomes their stepmother .
However , Mita knows that she can not become the stepmother of these children , and thus takes the drastic step of becoming a cruel and ultimately short - lived stepmother .
Urara , the children 's aunt , becomes Mita 's stepmother .
However , Mita knows that she can not become the stepmother of these children , and thus takes the drastic step of becoming a cruel and ultimately short - lived stepmother .