Synopsis

Mago is called away by the Hero Association and, unable to take Miel and Maelle with him due to the danger, he gives them clothes with his symbol so they can find shelter. Instead, the children isolate themselves for two years, developing their powers and forming their own views of good and evil. Later, they are sold at an underground auction for ability users, where they're eventually bought by a man interested in their unique summoning abilities of an angel and a demon, before he ultimately takes them to Mago.