In This Rebirth, The Male Lead Is Mine [BL] - Chapter 18: Opportunity

In the end of the era, the ghost wizard was killed in a car accident, the soul crossed, and he found himself in Japan, and he was attached to a Japanese.

I was thinking about taking a name in Japan, and I picked up a newspaper and glanced at it –

Kudo Shinichi, Sherlock Holmes of Japan’s Heisei, the savior of the police? In the trough, how does Laozi wear into the world of the second yuan? Well, all in all, this is a story of a wizard playing a passerby in the Conan world…

- Description from MTLNovel

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.

After dying from exhaustion in his dreary corporate job, Riku Sakamoto awakens to find himself reborn in the world of his favorite game — EverRealm Online. But he’s not just any adventurer — he’s The Grand Maximus, a max-level legend with every class unlocked and stats that break the system.Yet instead of battles or kingdoms to conquer, he’s greeted by something far more unexpected: the Peaceful Life System — a mysterious power that rewards him with modern comforts for every act of kindness he performs.Help a farmer? Get a fan. Heal a wild animal? Receive electricity. Solve a village crisis? Unlock hot baths, fridges, and fresh-brewed matcha.Armed with nothing but infinite power and zero ambition, Riku settles in a sleepy starter village to live the slow life he always dreamed of. But as he helps the villagers, befriends forest creatures, and lazily reshapes the world around him, his actions begin to ripple far beyond the village borders…After all, who needs war when you’ve got peace, pancakes, and a weatherproof roof?

It is an era of artificial superintelligences, interstellar travel, gene medicine, and virtual reality worlds. Far into Earth’s future, 15-year-old Gu Ding is a student of Cerulean Military Academy by day, and tavern waiter by night. His ambition: Become the space pirate with the highest bounty offered by the Universal Federation Government. With the help of Neptune, a neonate super-intelligence, Gu Ding finds himself thrust into a galaxy of shadowy organizations, political underdealings, and otherworldly forces that lie beyond human comprehension…