Lord of Winter: Beginning with Daily Intelligence - Chapter 412 - 269: New Weapons (Part 2)

Rogel downloaded a magical pixel game—“Mysterious Sea”.After manifesting the kitten from the game, he fell into contemplation...

Zong Shou is a player of the historical VRMMORPG “God Emperor,” and him being one of the “Seven Emperors” within the game.

For unknown reasons, Zong Shou finds himself transmigrated into the past, a period just before the “God Emperor” game history started! Possessing the weak body of a monster princeling in the process.

Zong Shou adventure describes his struggles to stay afloat in a merciless environment, and rising up despite all adversities, of course, surrounded by beauties along the way.

- Description from Novelupdates

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.

“Hero, where are you going?”“To eat.”“Hero, where are you going?”“To the bathroom.”“Hero…!”“…”The woman who followed me everywhere… Ended up following me all the way to Earth.———A former hero who returned to Earth, now unemployed and just lazing around at home.Then, the saintess who came with him made a suggestion—“How about streaming?”“Hmm… This might actually be a good idea.”And so, the Hero & Saintess Healing Stream begins!