The Dead Luna - Chapter 71- I’ll Get Back What Was Mine!

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.

After dying prematurely from an incurable disease, Yuka Hikano finds himself in a mysterious realm filled with endless doors, each concealing divine gifts from powerful deities. He is not alone—others who have met the same fate of death stand beside him, unaware of the trials that await.They are put through various tests and eventually transmigrated into different worlds. But these worlds are nothing like the Earth they once knew.For Yuka, however, this apocalyptic world feels eerily familiar. It is a realm of endless war, devastation, and chaos—a world he once played in a game. Certainly not the kind of place one would wish to be reborn into.From infancy to adulthood, he must gather strength, knowledge, and allies to survive the horrors that lurk ahead. But when he awakens a system granting him a power beyond imagination, he soon realizes that blessings can also be curses.[You have gained Infinite Mana.]Infinite Mana...?What could possibly go wrong?

The young president, Yu Shu, is vigorous and unsmiling. The outside world commented that she is a high-altitude flower that can be seen from afar but not to be played. Prejudice.
At first, she hated Zhao Qingying, just because this woman delayed her brother’s study, and later, it was because… she was too profligate.
Xiaolang’s hooves should be cured!
Later, really fragrant——
One day, my younger brother saw his idol sitting in his living room, and said pleasantly, “Brother Ying, why are you here?!”
Yu Shu said meaningfully: “Well, it’s indeed a big wedding.”

Zhao Qingying’s flourishing beauty is the center of the topic, the darling of the media and the favorite of the paparazzi, and there will never be a shortage of gossip targets around her. One day, she was interviewed.
Host: “The boss of the hotel is dating you, is it true?”
Zhao Qingying: “My brother.”
Host: “The financial tycoon is rumored to be your benefactor, is the news reliable?”
Zhao Qingying: “My father.”
The host asked weakly: “Then Yu Shu, who has been in frequent contact with you recently, who are you?”
Zhao Qingying looked at the camera, her eyebrows and eyes curved: “My wife.”

The cold president who is obsessed with making money from games X the big star who only cares about teasing girls

[Don’t ask, it’s sweet to ask! 】
Content tags: powerful rich family entertainment circle sweet text
Search keywords: Protagonist: Yu Shu (shu), Zhao Qingying ┃ Supporting role: ┃ Others:
One sentence introduction: can’t laugh.jpg

- Description from novelbuddy

SLASH!(So this is death?!!)I, Elysia, found myself dead before even reaching the Demon King's lair, and our Hero Party was completely annihilated.And this was done by none other than a fellow human—my former classmate.He had been mostly invisible during our time at the academy, but then he started committing one crime after another until he became a lackey of the Demon King.Who would have thought that the strongest party of humanity would be wiped out by humanity’s traitors?(If I could go back to the past, I swear I will kill you!)Just when I thought I could finally pass on, I opened my eyes.Five years back, when I first enrolled at Arcadia Academy.And there he was, the traitorous bastard of humanity...****“Huh? Where am I?”One day, I opened my eyes to find myself in an unfamiliar place and came to realize this was the world within the novel Savior's Dawn that I had read.Everything seemed to be proceeding the same as in the novel—except for one thing.The main heroine is glaring at me as though she wants to kill me.Could I survive with the main heroine after my life?