Primordial Soul's Rebirth - Chapter 9 - – Talk with Alice 2.

Have you ever thought about what the goddess in your mind will look like in front of others?

- Description from novelbuddy

【Welcome to the Love Simulator】【You can freely choose to simulate with women whose appearance rating is 7 or above (on a 10-point scale) and have basic connections to your reality.】【The simulation is entirely free; please explore on your own.】【After the simulation ends, the system will evaluate the results and provide rewards.】【Current number of simulations: 4】【The number of simulations is not fixed and can be restored through special rewards or the passage of time.】Wait—why are all the simulation targets such difficult-to-handle 2D female leads?

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.

An ordinary youth living in the year 2050 in the Western calendar accidentally came to a fantasy world created by the collision of magical elements and supernatural technology at the other end of the dimension…

- Description from novelbuddy