Kikoushi to Yuka Migaki no Otome

All she remembers is her name and age. Maggy was found walking along a highway and was passed from foster home to foster home, living a sad and poor childhood. One night, she’s scrubbing the floors of a coffee shop when a large man surrounded by bodyguards enters. He calls himself Reza, the king of the Constantines, and gravely declares that Maggy is the missing princess of his neighboring country. He trains her to become a princess. The reason? She was engaged to him the instant she was born!