Jujutsushi Wa Yuusha Ni Narenai - Chapter 207.1 - Snatched Item

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.

【 Warning: Mature Content R-18 】Graves lived a content life, until he lost it all. After inheriting a hotel and immortality. As his final act, he sacrifices himself to save a woman's life.To his surprise, he reawakens to find the woman thanking him in an unorthodox way.His once normal life changes with this new power, and by comical chance, he throws himself into deadly situations to save women from bullets, blades, fire, planes, tanks, and trains.His new life is one of pain, except he always ends up on top.Join Graves on his comical struggle through the unnatural disasters he faces for the sake of his love life.

Li Ling, the eldest son of the Duke of Zhenguo, was a good man with great talent and courage.

However, his beloved wife Shen felt that living with him was boring. After five years of marriage, she was submissive to him in every possible way, but he was not the least bit enthusiastic about her.

If it was just because of his cold temper, she would admit it.

But when the Huns invade, the ninth princess will be forced to get married. Li Ling was so angry that he asked for an order to go to war for the sake of his princess cousin.

She finally understood the reason why he treated her coldly.

She was so angry that she didn’t want to be with him.

The letter of departure has been drawn up, and we are waiting for Li Ling to return to sign it.

Unexpectedly, after waking up, she went back to the time when she was newly married to Li Ling…

—

Li Ling married a well-behaved little wife who was completely obedient to him. After being married for more than a month, she served him comfortably.

In the past few days, Li Ling discovered that something was wrong with his bride.

She stopped dressing him in the morning, and she stopped serving him dishes and soup at dinner. She turned away as soon as he approached her at night.

The dignified and solemn Li Ling couldn’t help it.

He came forward and said, “Madam, what’s wrong with you?”

She just gave him a roll of her eyes.

Li Ling scratched his head: “It’s your first time coming to the mansion. Madam, you don’t feel comfortable with it?”

She bowed her head and said nothing.

Li Ling was so itchy that he had to pay attention to her every move in order to pry into his wife’s heart.

One day, while watching a polo match, he saw her hiding her face and smiling at a man on the field; another day, he saw her resting her chin in her hands, reading a poem by a talented man in a daze; and at a palace banquet, he actually saw the prince. I smiled at her…

Li Ling’s heart became more and more confused day by day.

- Description from novelbuddy

Graduate student Yi-han finds himself reborn in another world as the youngest child of a mage family.

– I’m never attending school, ever again!

‘What do you wish to achieve in life?’

‘I wish to play around and live comforta-‘

‘You must be aware of your talent. Now go attend Einroguard!’

‘Patriarch!’

My future would be guaranteed once I graduate. For my future!