MTL - I Was a Top Student In Conan, But I Was Actually An Onmyoji - Chapter 361

A recurring nightmare afflicted Khan's nights since the Second Impact. His dreams replayed the scenes of the crash of the Nak's spaceship, an alien race that the humans had defeated five hundred years ago.

He was once a kind boy — loyal to family, faithful to love, and full of hope.But kindness means nothing in a world that spits on your loyalty.Roman died betrayed.His stepbrother beat him.His girlfriend cheated.His family used him like a slave — and when the world ended, they threw him to the undead.But death wasn’t the end.Roman was reborn — weeks before the apocalypse that would erase humanity.And this time?No more mercy. No more weakness.This time, Roman builds his empire in the shadows, manipulates nations, steals resources before the collapse, and creates a stronghold while the world sleeps peacefully — blind to the hell that’s coming.> What?! A supermarket in New York is completely wiped out overnight!Japan’s largest food storage warehouse was found empty — zero inventory, massive losses.Similar cases in South Korea and Australia? No trace, no witnesses. Just... gone.One man is preparing.One man is rising.Roman.But just when he thinks he's the only one pulling the strings in the dark...Others begin to move.Reincarnated. Ruthless. Just like him.The game is no longer survival.It's domination.In this new world, only one king can rule from the shadows.And Roman will burn the world before he kneels.

The simulation is over, and the entry is obtained: a showdown!

Looking at this entry, Zhao Meng was stunned.

“How should this term be used?”

“Hey! Here’s a wounded fox!”

…

A few years later, a woman who looked like a fairy appeared in front of him, and said:

“My lord, I’m here to repay my favor!”

This book is also called “Starting from Transforming Monsters”

- Description from novelbuddy

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.