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...