Five years ago, a plague wiped out a great part of the land of Fortna's population. Nina, a girl with unique, deep-blue eyes, counts her parents among the casualties of the pandemic. In order to survive, she teams up with a pair of fellow orphans and begins to steal from the wealthy. Unfortunately, Nina's life is struck by tragedy again as she finds herself being abducted by a group of mysterious men. Her main captor turns out to be none other than Azure Seth Fortna, the second-born prince of the royal family. His half-sister Alisha—a reclusive priestess-princess—perished in an accident before she was to be married off to the crown prince of the neighboring kingdom of Galgada. Although Nina does not resemble the late princess in the slightest, they do share one characteristic: their one-o