C1356 The Most Terrifying Monster in History

"You don't have to thank me. I did it for my sister. No matter what, I always thought that she would be able to live a blissful life forever, and not become the cold and merciless Infinite King. Elder sister …" In order to protect me, she forced herself to become strong and cold. She has always been the one protecting me, and now, it is time for me to do something for my sister