Multiverse: Deathstroke - Chapter 472: Aquaman’s Misery

I failed and will challenge 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.

Heavy rain poured down from above the dark clouds up in the night sky, filling the sky with droplets that splatter on the muddy ground of a narrow road. Thunder and purple lightning roar resounded over the clouds.

This was a night that would forever be remembered.

Bernard was a poor young man with a dream just like any normal human would have, he wanted to survive and make ends meet.

However, he was rendered hopeless when he realized just his certificates and hard work alone, wouldn't be enough to climb up the ladder in the society, he needed connections as well.

Putting his frustrations aside, Bernard decided to work harder, however on his way home something that would forever change his life happened.

Bernard was bitten by a strange Cat in his dark room and entered a strange world...the Symbiote world, with this strange twist of fate, Bernard soon realized the hope to fulfill his dream was rekindled once again.

[Daily Quest: 'Meow Meow five times]

There’s the so called class transfer.

Among the high school students that were given cheat abilities, Kirishima Ran was given 『Underling Training』for some reason, a skill that can make a woman a slave.

Ran who was driven out by the kingdom using an absurd reason will make use of the given skill freely to take revenge on his classmates, release his desires (This is mainly the reason), and fight off the world’s system.

It’s a story of him using his wonderful skill making his classmates turn to an obedient cute and lewd slave.