I Have the Alchemy Emperor in My Head - Chapter 2344 - : With Me Here, None of You Can Turn the Heavens Upside Down!

A good-for-nothing man married a beautiful girl but was kicked off the bed on the wedding night. Furiously, he wrote a bill of divorce and ran away.
He was schemed a car accident in which he nearly lost his life. However, it turned out to be a blessing. He swallowed the soul that passed through the outer world, thus obtained superb medical skills and martial arts.
Later on, with the silver needles and invincible martial arts, he embarked on the road of counterattacks and was committed to his great dreams.

- Description from Novelupdates

“My name is Shun Satsujin. I'm an orphan… and someone who died only to be reborn into a world filled with fictional stories I once knew.”I expected a cheat ability—something powerful or overpowered. But all I got… was an intense exercise method called Herculess Method and a challenging life.Now, I'm just trying to survive and stay on track.That was the plan—until I enrolled in Shuchiin Academy.And suddenly, I found myself surrounded by girls from anime I used to watch.One by one, they started getting involved with me.

[Ding!] [The Milf Hunting System is online] [Seducing and conquering older women would be made possible with this system] [Isn’t that exciting host?] This was the notification Jay received after dying and transmigrating into the body of a 17-year-old boy named Ryan. He considered life to be meaningless and boring while he was still on earth. Then he died in an unexpected way after getting hit by a truck. Thinking that was his end, he was completely wrong. After meeting with a certain god, he got transmigrated into a world where powers, magical beasts, and so on exist. But things would be different in this world, life wouldn’t be that boring anymore because he has a task now...seducing and conquering milfs. Armed with the milf hunting system, he’d be able to conquer a lot of milfs, benefit from conquering them, and become stronger in the process. Follow him through his journey...

A fluffy, sweet modern GL story about a mature older women and a cute university student.