The Heir to the King's Stomach

I transmigrated into Morgan Le Fay, heir to the holy city of Camelot and the strongest witch before Britain. It sounded pretty good, until the late king's death, when a wandering con artist named Merlin swindled my kingdom away with a prophecy. A sister who came out of nowhere, Artoria, seized the throne, and now another prophecy says she intends to erase me completely?

Taking her sweet daughter Mordred along, the wandering princess Morgan kept a blank expression. Damn it! This is my throne! I, Morgan Le Fay Pendragon, am your emperor and the rightful heir to the kingdom!