The “Nestling Court,” a court where princesses from the five clans are gathered in order to raise the next empress.
Reirin, a frail Nestling who is often called the next empress and is as beautiful as a butterfly, ended up switching bodies with the Nestling who is jealous of her, Keigetsu!
Suddenly, Reirin is hated by everyone around her and called the Rat Princess.
She is put into a horrible environment where no one trusts her and she’s despised by the people who have always been kind to her, but…
“I’m not out of breath, and I don’t faint… What a healthy body! I, I’m so jealous…!”
Reirin, the one who everyone envies, is a person with a steel mentality who has been battling death all her life——!?