In the world of the otome game "Revolution," a corporate slave OL named Ohashi Rei has been reincarnated as the heroine Rei Taylor. However, her favorite is not the target princes, but the villainess Claire Francois! After the commoner movement led to the exile of Rene, Claire becomes depressed, and Rei wants to cheer her up somehow. One day, news arrives that the princess of the neighboring country, Manaria Suus, who Claire calls "Onee-sama," is transferring to the Royal Academy. What action will Rei take in response to the emergence of her greatest rival?──