The Youngest Child of the Family is Preventing the World from Ending (Associated Names)

“The s*upid youngest who doesn’t know how to do anything, only believes in her cute face, and causes troubles, is her.” The angry me looked at the mirror once again and shouted. “Just why out of all the people, am I that ‘s*upid youngest’ Diana Cartier!?” Diana, the villainess who was brainwashed by the villain…