The Wandering of an Unstuck Stepbro: Multiverse Travel - Chapter 287: A three-way battle

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.

Within the dream of the dreamer, the one who was dreamed of awoke.

Romance Carnival 1st Prize. BEWARE THE FURY OF A PATIENT WOMAN. Rosalind Lux died after learning of her husband and sister’s betrayal. And just as she thought she finally found peace, she woke up forty years before her death. With memories from her past life intact, Rosalind vowed revenge. Her plans quickly brought her into the arms of a Duke whose enticing gaze contained mysteries that threatened not just her plans but her heart and body. …. BEWARE THE LOVE OF A CURSED MAN. Punished by the Goddess for his greed, Lucas Benjamen Rothley had been guarding the North for as long as he could remember. For hundreds of years, no woman has ever stirred his heart. That was until the fearsome Rosalind Lux stumbled into his life. Soon, he realized Rosalind wasn’t quite the damsel that she liked everyone to believe. She is hiding a secret so dark it could either end his curse or throw his life amiss.

You shall become king—

Ruling over all “serpents” in the world…

Become the man who bears the brunt of dragonkind’s fear and hatred.

A modern era when humanity is threatened by attacks from giant dragons flying from beyond the sky.

Controlling “leviathans”—serpentine spiritual beings created through magic—humanity is locked in a protracted war of resistance against the dragons.

Fortunately, there exist witches known as “magi”—battle maidens of salvation who formed covenants with “serpents” in order to combat dragons.

Nicknamed Hal, the young man called Haruga Haruomi makes his living through facilitating the covenants of these girls.

At the (partially coercive) request of his childhood friend Asya, one of Europe’s top witches, Hal returns to Tokyo New Town after an absence of three years.

Accompanied by the beautiful Asya whose appearance rivaled a fairy’s, Hal is running all over the place to secure his base of operations and taking care of matters related to school transfer when the elite dragon Soth suddenly attacks—!?

Life has been breathed into a brand new myth between dragons and dragonslayers.

A grand opening to the “birth” of a top-class battle epic!