A Socialite from the Abyss

In a modern world overrun by monsters, humanity, worn down by the endless struggle, begins developing superweapons. In the deep sea, they find a legendary red box said to contain immense power, and plan to use it to create a powerful humanoid weapon. Then things get out of hand. Pandora was sealed away in the primordial age of chaos. By nature, she was unruly and free-spirited, and so powerful she was unsettling. She caused immense trouble for both humanity and the monsters. The two sides reached a temporary agreement and joined forces to seal her away. Ten thousand years later, humanity opened the box and unleashed Pandora, along with the power and curse of the Seven Deadly Sins she carried. They begged her to take humanity's side and destroy every monster on Blue Star. The red-lipped, white-toothed girl crossed her legs and smiled like an angel. "I'm bored," she said in a lovely voice. "Give me an interesting choice, or I'll destroy you all." ** Cyrus is a space marshal who transmigrated from the future. He swears he will become humanity's leader and save the future from the past. But he was too late to stop humanity from releasing Pandora. Arriving too late, Cyrus somberly brought along humanity's most advanced weapons, ready to fight her to the death. To his surprise, the fiend who would destroy the entire universe in the future was now just a bored, adorable little girl. To change the future in which Pandora becomes corrupted and destroys the world, Cyrus has no choice but to begin his "nurture the seedling" mission. Pandora, who had been planning to cause a huge commotion: Wait, the leader of humanity in this generation is that handsome? Hmm... Messing with the marshal seems a lot more fun than destroying the world. [Strikethrough]That's right, a story about a female lead messing with the male lead.[/Strikethrough] Reader's guide: 1. The female lead is the most powerful being in the world. She is an adult when the story begins, a villain in her original world, and a naughty kid in this one. [Strikethrough] 2. A gender-flipped take on "transmigrate to before the villain turns evil and save her." The female lead does whatever she wants, while the male lead faithfully does his duty. 3. Set in a fictional world with monsters (with a somewhat Western-style nonhuman aesthetic). Theme: