Born with black hair, a characteristic of villains, Julia was persecuted and labeled a "devil" by her family. Because of this, she lived quietly, hiding the fact that she possesses immense magical powers. But one day, King Louison suddenly chooses her as his new wife. And suddenly, she becomes the stepmother of twin princes...!? She intended to refuse, but the adorable, angelic princes instantly smitten her! However, due to the superstition that they are "unlucky twins" and their lack of magical powers, the future of the twin princes is incredibly difficult... Julia sees a connection to her own situation as the unjustified discrimination they face, and resolves to protect and raise them as their stepmother! "I'll protect the smiles of the twin princes!" This is the beginning of a parenting fantasy filled with family love, featuring a hated villain known as a "devil" and angelic twin princes!