MTL - Amnesiac Queen - Chapter 45 clue

What if Magic has always existed ever since the beginning of the Earth we are living on, but history has been written in order to hide these facts. What if the prosperous and well-known people in history is actually a mage?

Enter a magic academy, rule your country. Be at the pinnacle of life! Join me in the journey of Emery and the others in the world of Knights and Magic as he becomes the Earth's Greatest Magus.

A person died in our world. And when he opened his eyes again… the stars had changed.Reborn into the age of myth, long before his time and when Olympus stood tall, he awakens in the Garden of the Hesperides. Reincarnated as the God of Power he is now watched over by mysterious nymphs under Hera's silent command. Unaware of the divine politics at play or the godhood now within him, he must navigate a world of titans, monsters, and primordial chaos.But he’s not entirely alone. A mysterious System, has merged with his soul, offering quests, powers, and choices that creates and enhances powers and help him shape his path toward ascension. As the gods begin to stir and ancient forces clash for control, the new deity must find his place in a pantheon not yet formed and carve a name into legend with power, cunning, and the will to rise.Because in this world, divinity is earned.And only those who ascend... survive.Author's Note:This story draws inspiration from Greek mythology, but takes creative liberties for the sake of narrative and worldbuilding. While many elements remain faithful to the ancient myths, others will be reimagined or altered entirely. Please enjoy this interpretation as a myth of its own.

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.

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.