Tate no Yuusha no Nariagari - Chapter 83 - Magic Lore

In a certain world, there was someone who excelled in magic combat, people called him 『Sage』. Seeking the strongest combat art, he devoted himself to research every magic and combat arts in existence. And the conclusion he arrived at was very cruel, 『My body is not fit for magic combat』. Yet he didn’t give up. He sealed his own soul with a magic art, and was reborn in a far-off future. And the magic theory in the completely changed world he saw there was of unbelievably low level.

A one-night stand was all she wanted. A one-night stand was not his style. Still, they ended up together in a night of passion. No names, no feelings, and no complications.

They thought that their unexpected encounter was an isolated incident. However, fate had something else in mind.

As they found each other, back in each other’s arms. Not in a passionate embrace, but with a contract that would bind them for a long time. An agreement they were both bond to honor.

Daniella Hamilton was an heiress who wanted nothing to do with her father and her inheritance. She pursued her career to become a lawyer for the masses who could not defend themselves from the injustice in their current judicial system.

Alexander Princeton, as the name suggested, was a possible heir, next in line to his father, the Duke of the Blackstone House. He also wanted nothing to do with the title or the prestige of the dying Royal Empire. To him, wealth was the real power.

Would their agreement lead them to the fulfillment of their dreams or would it end up in a disastrous union?

An underprivileged prodigy, a cruel, ruthless world, and an epic story of battle and conquest. A young man with an exceptional inheritance leaves the small, rural city from which he hails on a journey to find the girl of his dreams. He defeats countless prodigies, sweeps through all forces that dare to stand in his way, and progresses step by step toward the pinnacle of all the worlds!
“I’m not targeting any gods in particular. All I’m trying to say is that all gods are trash in my eyes!”

- Description from Novelupdates

A lost soul from Earth transmigrates to a world of cultivation and finds himself in the body of a playboy noble and complete waste. Except he doesn't have any memories, can't let anyone know he's not the same person and is immediately involved in a conspiracy with a powerful noble family.Luckily he came to this world with a power, whatever he gives to someone as a gift he'll get it back 100 times better.His first target?His new wife, the former top young genius.