Transmigrated into Eroge as the Simp, but I Refuse This Fate - Chapter 347: Steps

Known as the youngest academician-level senior engineer, Zhao Guoyang was reborn in the 1990s. In this era of economic globalization, with his extraordinary wisdom and extraordinary insights, he created one miracle after another and became a name that shocked the world!

Wisdom is condensed every bit, brilliance is created by sweat, and witness the rise of a great power!

- Description from novelbuddy

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.

Sanctora has known peace for generations—too long, perhaps.Built upon ancient ideals and ruled by a council bound to tradition, the kingdom believes itself untouchable. But beyond its tranquil borders, something has awakened. Whispers of vanished heroes, creatures long thought extinct, and shadows that no longer sleep begin to creep back into the land.Liora never wanted to be a hero. Orphaned young and shaped by loss, all she’s ever known is survival base on love and kindness. But when a brutal invasion exposes the kingdom’s deepest vulnerability, she’s thrust into the heart of a battle far greater than herself. Her light-element magic—once dismissed as minor and passive—may be the key to a new era of power.As Sanctora struggles to adapt, Liora must decide whether to follow the path laid out by those before her… or blaze a new one through fire, blood, and truth.Epic, emotional, and filled with slow-burning revelations, Ancient Beast Summoner is a story of legacy, buried power, and the girl who just might change everything.

When Xiao Fei was three years old, he was caught by a man with a sharp-nosed monkey and taught him to cultivate. The old man is Sun Wukong. In the past ten years, he has taught him the eyes of the fire, the copper and the iron bones, and the great product of the immortality… After the learning, Xiao Fei went down the mountain and accidentally entered a noble school. Pure school flowers, the best Lori, Miss Qianjin, beautiful maid… I like to sleep with him. Oh no, it’s a friend.

- Description from Biquge.com.cn (translated)