The Real Rich Daughter is a Future Genius Scientist - Chapter 383 - : The Premiere

The world that nurtured the civilization which reached the pinnacle of magic was on the verge of destruction.
The last survivor transmigrated to the past, when the magic civilization started growing, as countless mages were still fumbling their ways through the thorny paths of magic knowledge.
He, who came from the end of the magic era, aim to reach the pinnacle of magic.

- Description from Novelupdates

“If you were the supreme master of the Dao of Immortals, revered by countless beings, able to glimpse life and death, and understand the destiny, what kind of woman would you seek as a partner?”Jiang Feng: “I would marry an eighteen-year-old.”“...do you want to die?”“I'd rather die to marry an eighteen-year-old.”

After losing his parents to an accident, Haruto is thrust into a state of depression. Realizing he never had the power to change things, he eventually took his own life. Before moving on, he’s selected by beings greater than his understanding to balance out a world suddenly facing peril. The world of Mordell, where demon-like creatures and beasts roam, and Guilds of ability users called Warlords are the force to combat these creatures. Armed with the power to change things, he has the choice. Continue living in despair or accept his second chance and become a true Warlord.

The only way to stop the earth’s doom.Is to seduce the girl who is the student council president.