Maoyuu Maou Yuusha - Volume 4 Chapter 9, “The Crown Prince Marshal. The World’s Greatest Hero.”

At the height of her power, the Supreme Goddess Amane also known as the Beast princess sacrificed herself to save the life of children she had adopted throughout her life. That should have been the end of her story. Amane had achieved her ultimate goal of saving the lives of her loved ones and her sacrifice would give them all decent lives. But the Supreme Goddess felt her eyes opening in a new body and a new era. She had been reincarnated into the body of a Yoko Tsurugi, the mentally-challenged adopted daughter of the Tsuragi family (The family infamous for their beast-taming business) Reincarnated in a new body with no knowledge of why she had been brought back, Amane decided to embrace her new identity and live a carefree and easy-going life doing what she was known for before. She would do what the previous owner of her body was unable to do - Show everyone why you did not mess with her, the supreme tamer of beasts. The new era was different with no ‘alliance’ or distinction between races. The world was a calm place that seemed to have a place for everyone. Amane, now Yoko, should have a decent new life. But the past refuses to let Amane go and the circumstances behind her resurrection were becoming more and more complicated. It was more than clear that something seemed to be brewing in the background of this new era. And the balance of power was not as even as it first appeared to be. Who had called Amane back in her new body? And for what purpose was she brought back? These questions might be more important than they first appear to be.

[WSA 2025] To confront the threat posed by monsters and demons, humanity summons a hero endowed with a mysterious system and an unrivaled capacity for evolution. He becomes the last bastion of hope for mankind. However, one of his mistakes gives rise to a calamity far worse than the Demon King.This calamity is conceived in a dungeon, abandoned as a fetus by its mother, and raised by the Demon King himself. Upon the Demon King's death, all the restraints he had placed upon the creature are shattered. Thus, the hero's nameless son begins to lay waste to everything. The greatest calamity the world has ever known is born.

This novel is also known as Master Fu's Mysterious Darling Wife

She is the The Young Miss of Military family Shen, her face is peerless, her temperament is cold, and she is her family’s treasure, but isn’t accepted as one’s child by her mother;

He is The Sole Heir to the top giant Fu Family, his power is unparalleled, indifferent high-born, the captain of the mysterious military force, and the youngest commander-in-chief.

Because of her grandmother’s wishes, she married him at lightning speed. She thought that it was a marriage that she needed, but she didn’t expect to be greeted with his extreme pampering.

- Description from Novelupdates

I, Ning Daoran, have achieved what I have today step by step, relying solely on my own efforts!