Sin System: Demonic Harem After Reincarnation - Chapter 44

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.

[ R18+ ]“TAKE YOUR SHIRT OFF…NOW!!” Zara commanded the king Erythian in anger as her eyes turn blood red.he didn't see it coming and his face is flushed with shock..“WHAT? LYS—” he asked before she interrupts.“if I have to ask again...I WILL DO IT MYSELF” she is unrelenting.Does Eythian comply?Zara, a modern girl from Colombia law school is transmigrated into the body of an ancient queen.She wakes up as Queen Lysandra.With a turn of events, she is Obsessed over by the ruthless, Warlord Alaric and finds herself Falling so dearly for him even if she is aware that it’s forbidden.Simultaneously, she is also betrothed to and in love with his enigmatic half brother King Erythian.let it be known that both brothers detest each other.she fights to hold on to her heart, but fate is cruel.Everything shatters and the man who destroyed her…now owns her.The lines between love and duty are blurred as Zara must navigate threats against the kingdom, alongside the love triangle with her between two brothers who despise each other.As she is taken further into a world of secrets.Will Zara honor Queen Lysandra`s duty to the crown and her people, or will she risk it all to follow the desires of her heart?

The middle boss of the AAA-class game produced by the company. The villain who dies 999 times out of 1,000 times. Deculein.That person, was me now.“You’re going to die on almost every route.”Deculein, like all villains, inevitably dies.[First and foremost survival goal: Be what the game requires you to be]I’ll have to survive even if it means twisting my fate if I am destined to die.

From infancy to maturity, what Ye Zhou dislikes the most was “two”.

The reasons were: he was ranked second at home, he had been forever ranked second at school, no matter how diligently he worked and tried, he couldn’t shake off that “second” curse. What was more exasperating was that, at University, not only was he ranked second, but even his appearance that he was proud of had to be classified as second best!

Why can’t I obtain the first place!

The eternal second will rise!

Then, Ye Zhou, after his vigorous efforts finally rises and the result was… the first became his boyfriend.

This is the story of a man who has been forced to be “second” and how he became the first, most popular.

- Description from Novelupdates