Reirin, a beloved and brilliant noble girl being groomed to become a future royal consort, has her body swapped with Keigetsu, a disgraced and hated rival noblewoman. The swap leaves Reirin trapped in Keigetsu's body just as Keigetsu is sentenced to death.
Instead of despairing, Reirin—who spent her life sickly and frail—is thrilled to finally have a healthy body. Even after being exiled, she wins people over with her kindness, optimism, and resilience, overcoming one challenge after another.
Meanwhile, Keigetsu, who had long envied and resented Reirin, begins to understand and appreciate Reirin's true character while living in her body.
As the two girls' lives become intertwined, they are drawn into a larger conspiracy within the royal court, setting the stage for a dramatic tale of identity, redemption, and political intrigue.