Hoshifuru Oukoku no Nina

Nina survives as an orphan on the streets of Fortna's capital, stealing what she needs and expecting little from tomorrow. Her rare deep-blue eyes, however, match those of Princess Alisha, who secretly died before a political marriage meant to bind Fortna to the powerful kingdom of Galgada.

Prince Azure brings Nina into the palace and gives her an impossible task: learn to become Alisha in public, then leave to marry the feared Prince Sett. As she studies court etiquette and carries the name of a dead girl, Nina grows attached to Azure and begins to fear that when the time comes to depart, nobody will be left who remembers the person she truly is.