Futsutsuka na Akujo de wa Gozaimasu ga: Suuguu Chouso Torikae Den

In a kingdom modeled after historical China, five noble families send their daughters to compete for the position of empress. Kou Reirin, known for her delicate beauty, is expected to win the favor of the crown prince. During the Lantern Festival, Shu Keigetsu, a girl nicknamed the “court rat,” confronts Reirin. The next day, Reirin is found in the dungeons, having been swapped into Keigetsu’s body. Everyone assumes Reirin is in trouble, but she now possesses Keigetsu’s strong and healthy form. Despite the danger of execution, she finds herself in a better position than before.