Demon King of the Royal Class - Chapter 521

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.

First Gift: Dynamic Vision → Bullet Time → Inherent Time Control - Acceleration → Inherent Time Control - Time Stop…Tao Yu reincarnated into a world being devoured by the Abyss and discovered that as long as he was willing to expend enough Yuan Force, he could infinitely enhance his skills.With the help of his special gift, Tao Yu gradually realized that the world fragments within this Abyss were somewhat different, containing parts of Earth’s remains, and even legends from Earth were buried within…

I’m a roleplayer. A gamer who creates characters according to their classes and happily acts as them.“Don’t… Touch me……”“Talk more and see if you can handle my wrath……”My current character was a Demon Knight who kept a Demon sealed in his right arm! One day while I was just acting as my character and enjoying the game as usual……“Log out.”[This command cannot be carried out.]“……? Log out.”[This command cannot be carried out.]“……???”And as if not being able to log out wasn’t enough…“You disgusting Demon! So you finally took over Sir Demon Knight’s body!”“My eyes cannot be deceived! Sir Demon Knight isn’t that kind!”Because of my damn companions I couldn’t even stop role playing!Can this role playing gamer faithful to their setting ever return to reality?

He Ruge was addicted to “Your Exclusive Lover” this love nurturing game. Captivated by the attractive military uniforms person, whose original form was a White Tiger Male God.

When the game came to the end, He Ruge suddenly become a mermaid and transmigrated, and he was even the legendary Koi Mermaid with flourishing beauty, charming singing and exceeding good luck?

The place where he fell was even more unusual – the bathtub of the Male God!

___________

The federation’s Xi Guican, a man whose stamp of his foot could make the whole intersteller tremble. During his recuperation, there appeared a love game that could not be deleted from the optical computer.

The plot of the game was his secret past. In this love game, he returned to the experimental days of No. 20, allowing people to slaughter and bully him, there was only one variable.——

It’s his exclusive lover.

The love that came from the light, taking him out of the dark.

- Description from Novelupdates