The Youngest Is Trying to Prevent the World From Ending

After hitting my head, I remembered my past life and realized I was in a novel. Ugh, why do I have to be Diana Cartier, the bratty child brainwashed to do evil deeds and destroy the world?! I won’t let that happen. I’ll stop the end of the world with my own hands and save my brothers! Wait, why is the novel’s protagonist lying on the street? And oh, aren’t those animals so cute? Make way for the cute youngest who’s trying to save the world!
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"The stupid youngest one, the one who doesn't know how to do anything, but causes trouble with her cute face."

Exasperated, I looked in the mirror once again and exclaimed, "Why am I the 'stupid youngest one' Diana Cartier!"

In the novel The Ending Can't Be the Destruction of the World, Diana is an evil woman who repeatedly commits evil deeds and is brainwashed by the villain, contributing greatly to the destruction of the world! If something could go wrong for the villainess, it will. But when something went wrong for me, I recalled my past life instead? As an ordinary college student in my past life, I made up my mind when I realized that I had been reincarnated as Diana Cartier, the villainess in the novel.

"The world is going to end. But I'm not going to let it happen."

Yes, I will prevent the end of the world with my own hands! And save my brothers from the conspiracy at the same time! Wait a minute. What's that pitch black thing sprawled out on the floor over there? Wait. That face, where have I seen it before?

'Is that Linus del Stein?!'

Why are you lying there, Mr. Protagonist of the novel who will destroy this world?

Diana and her brothers are trying their best to stop the end of the world! And cute animals and other stuff? Our sweet youngest is preventing the end of the world, get out of the way!