Surprise Marriage to a Billionaire - Chapter 458: Make You Pay

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

Western VRMMO【DEMONDAL】was known for its extremely harsh game system. To begin with, there were no levels. There were no skills. There were no guilds. There was no inventory. There were no convenient system messages or maps of any kind either. It was so needlessly realistic that it was already basically a VR life simulator.

As for anything game-like, it was basically limited to weapon masteries; a proficiency level that you got from using your weapon, as well as physical strength that increased as well. That was it.

It was a fantasy game so there was magic, but forming a contract with a spirit was extremely difficult, and only 1% of the playerbase were magicians.

In this VR game【DEMONDAL】that was ridiculously close to reality, the protagonist Kei who was a well known mounted archery expert, was one day sent to another world with his Russian【DEMONDAL】friend.

The game that was severe to begin with had turned into a reality, and the harshness increased again――

A scientific genius named Thomas Harrier was transmigrated to an imperial prince body after a car accident that took his life. He found out that he is in a world similar to our own with a timeline akin to early twentieth century. The body that he is occupying was the imperial prince of a failing empire who suddenly rose to power after a successful assassination attempt of his father. Unaware that the attack is just the beginning of what is to come. He faces many challenges throughout. Will Thomas Harrier be able to live his second life in peace while running an empire and getting it back to its former glory? Or will he succumb into a conspiracy lurking within the country's borders?

Expect some:

Cold war era techs.

Super battleship with advanced electronics, propulsion, and fire control systems?
Helicopters?
Missiles?
Modern medicines and equipment?
AC-130?
A nuke?
Challenger or Abrams or Leopard?
F-4 Phantom or MIG-21?
Colored TV's.

Everything!!!

PS. Cover not mine, I just found it on google.

A world where waves of monsters descend every night...A world where only the strong can survive.Axel, a burned-out man from modern Earth, wakes up in a desolate wasteland with nothing but a strange “Harem Settlement System” with him.Given the power to build, command, and grow stronger, he sets off to carve out a safe haven in this broken world. But as his settlement grows, so does the number of beautiful and deadly women drawn under his blanket-ahem!-banner.Witness Axel's journey, rising to to the peak. From a simple, lone survivor to becoming the Wasteland Overlord. With the help of the loyal, dangerous, and irresistible thirsty harem girls!