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!