Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 17 - 17-14. Changing World 3

Shen Yaowei was an idiot her entire life, and was finally sent to death by the person she trusted the most. After being reborn, Shen Yaowei was no longer silly. She just wanted to cling to the future tyrant and live a life of luxury. Possessing almighty skills and being known as a foolish girl, Shen Yaowei pretended to be an idiot and went on a killing spree, abusing the scumbag until he cried for his mommy and daddy. Anyone who stopped her from clinging onto the tyrant would have to die. Soon, everyone discovered that the frightening Prince Li, who had always been a loner, had changed. There was always a small shadow following behind him. “Ninth Uncle… I don’t have the strength to walk. I want you to carry me…”

the little shadow spread her arms towards His Highness, looking pitiful. “Yaoyao, I’m strong so I’ll carry you!” her elder brother, leader of the martial arts alliance, arrived at the battlefield instantly. “No, I’m stronger! I’ll do it!” her second brother, a miracle doctor, came forward. Then her third brother, fourth brother, fifth brother… All the bigshots had arrived, asking for hugs and to let them carry her. “All of you, get lost! That’s my darling daughter, so I’ll carry her!” Her father, a great general protecting the country, rushed as fast as possible to Shao Yaowei’s front, only to find that the aloof, noble and peerless prince had already knelt with his back facing Shao Yaowei. “Come on, Yaoyao. I’ll carry you.”

“SSS Skills are said to have a will and inheritance. What more have you inherited other than your immortality, Deathless Hunter?”

“Death... your demise is also in my hands.”

Reincarnated into a world where women sit on authoritative seats, Hunter appeared to lack both mana and skill.

However, aware of the real circumstances of his body, he kept his true strength and past life a secret and lived as a sidekick to the village's primary hunter team, hiding in plain sight as “just a man.”

On one fateful day, Hunter's role changed dramatically when his hunting team encountered a red wolf, an enemy they could not defeat.

The beast's jaws appeared to have killed Hunter, but in reality, they had awakened his slumbering SSS Skill - Deathless.

But is immortality all there is to this seemingly simple yet remarkable skill?

Invited by the gorgeous woman known as the boss of the guild Darkness, Hunter leaves his village to learn more about himself and to get stronger to consort with the most beautiful women of this female dominated world!

To become him! Yes, him! Him... wielding the law of Death across the entire universe.

The Death Himself...

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After suffering so much on earth, Liam died with his heart filled with hatred for heaven and humans.....

At the great void of reincarnation, he disobeyed a god and entered a different reincarnation portal....

He was reborn in a new world, possessing immersive bloodlines abilities....

With this he have finally started his journey of going against the heavens..

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.