When Ludia Centrin swears the Oath of the Sword to Prince Frau, she vows to submit herself and protect Prince Frau for the rest of her life. That is, until she is accused of plotting treason against the Empire and gets executed. Meanwhile, an accident leads to the loss of Elfreda, the daughter of Count Reinhardt. But Ludia, as if by a miracle, takes on a new life with Elfreda's memories and soul embedded in her body. As she wakes up in her new body as Elfreda, she is overwhelmed with divine powers she's never felt before. Will Ludia be able to find out the secret behind her falsely accused death?