Gretel is assigned to investigate the crime of the century—the mysterious disappearance of the king. Her brother Hansel, a notorious trickster, casts a shadow over the impeccable reputation of the Magic Control Agency, complicating an already difficult case. The secret organization knows that only by combining Gretel's knowledge and Hansel's cunning can they hope to find the king. Together, they will trace the eerie and enigmatic secrets of the magical world, battle sinister forces, and challenge a powerful witch.