Countess Calmia "Mia" Phlox, together with her lover, Storoni Primuli, has achieved all she ever desired: her title, political power, and victory over her nemesis, Rudbeckia Matari. But as her enemy breathes his last, Mia awakens as her 10-year-old self, shortly before an accident that would claim her twin brother Ellua's life and set her on a clear path to success without competition.

This time, however, Ellua is saved—by none other than Rudbeckia. Moreover, Rudbeckia shockingly proposes an engagement with Mia, promising to help her inherit the title of countess and annul the arrangement once she turns 20. Foolish as she is, and as much as she detests Rudbeckia, she soon begins seeing things differently; old foes prove incredibly valuable, while formerly trusted allies reveal their greed. Determined to realize her goals once again, Mia must decide who is worthy of her trust—and her heart.