Marriage contract: Genius baby's belly daddy - Chapter 2424

The unparalleled Demon King Ye Xuan, who was able to heal the death or the living alike and holder of the medicine Holy Scripture, was betrayed and killed by his fellow Demon Kings. But he reincarnated into the body of Ye Xuan, the prodigal son of the Ye family and vowed to himself that he would return to his peak and take back everything that belonged to him!

- Description from Novelupdates

Suddenly a high school student Subaru Natsuki has been summoned to another world on the way back from the convenience store. With the biggest crisis of his life being summoned to another world and no sign of the one who summoned him things become worse when he is attacked.

After leaving earth in a pathetic way, Asher finds his soul in the body of a baron's bastard son.As the last surviving member of the Ashbournes, Asher must take up the mantle and build his territory or die in the jaws of a beast or the blades of hungry nobles greedy for his territory.Luckily, he did not enter this man-eat-man world without support.[Ding! Soulbinding successfully completed.][Would the host like to upgrade your bronze-ranked butler to a powerful silver-ranked swordsman? Yes or No.]

A hundred years ago, he was a genius of the Emperor's Domain who made even the God of War wary. He was unparalleled in both alchemy and martial arts. However, his friend betrayed him, leading to his untimely demise.A hundred years later, he rose from being a dandy young master, starting everything anew. From then on, the world witnessed the emergence of an extraordinary genius.“Boss is even more ferocious than a wild beast!”“Boss values friendship above all else. He is forever my best friend!”“Kevin, no matter how long it takes, I'll wait for you. I won't marry anyone else!”“Don't ever provoke that man of calamity. That guy is a beast!”“I am Kevin Anderson, who dares to defy me?!”