Saving Rene!

Synopsis Remi and her sister transmigrated to another world. I became the daughter of Count Kermiys. René became an imperial princess and was forced to marry the demon king for peace. Won't I accept it so easily, my sister marrying the terrible Demon King? entering the church before her sister was married, walking through the church hall everyone was pale with her presence as if they knew what would happen next. "I as a saint of this church am against" The guards stopped me by force, the demon king took my sister. After so much turmoil, I am exiled for interrupting the marriage and almost preventing world peace. "I will train to get strong and rescue Rene"