After Using Cheats, I Became The Strongest Beast Tamer - Chapter 6 - Sister’s Secret

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.

Roan transmigrated as an FBI investigator.Several years later, a journalist interviewed the world-renowned detective Roan Greenwood and asked,“What made you persist in solving cases for so many years?”Roan tilted his head and glanced at the sports car beside him, the villa behind him, and the beautiful woman inside the villa. He smiled slightly and said,“Well, the bonus after solving the case.”“What?”

An unknown parcel arrives to Yoshio, a 30-years old NEET. The content is a game disk titled “The Village of Fate.” A beautiful CG game with real-life images gets started.

The female soldier king traverses into a useless little girl, confronting the strongest ghost lord who is both salty and sweet.She is the first legendary female soldier king in history, who traversed and was actually sold by a scumbag!!Unable to cultivate, abandoned, and cursed for a hundred lives, without a good ending?She holds a book defying fate, enslaving the heavens, making the earth her servant. Whoever splashes dirty water on her, she boils it and splashes it back.Punching scumbags, kicking white lotuses, with the universe in her left hand and the world in her right, she counterattacks in one fell swoop, changing the winds and clouds.Behind her, a lazy voice calls out.“Stop right there. I've confirmed through the eyes, you are the woman this lord wants to flirt with.”