Demon Queen Melissa

The former demon lord ruled over both humans and demons using fear. But then one day, a hero arose, and defeated them. Now a new ruler has emerged. Her name is Melissa. She possesses the power of her predecessor, but having lived for so long in a world with both species coexisting, she's adopted the ways of humans. One day a human hero named Lufia came to Melissa to offer her a formal greeting. Despite the former ruler being killed by a human, Melissa accepted the greeting with gratitude. However, Melissa's trusted servant Marina notices Lufia acting suspiciously and tries to intervene. In that moment a holy curse gets cast upon them, sealing their powers. How will Melissa regain her power?