MTL - The Fake Daughter Made a Sensation All Over the World By Relying on Metaphysics - Chapter 22 we spoil you too much

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.

God: I shall bestow the Saintess upon you.
Pope: W- wait a moment! This is a boy!
God: That is the Saintess.
Pope: ??????

And just like that, the Saintess was raised by the church for fifteen years without any questions asked…

- Description from Novelupdates

I met the male lead in prison.

[True to its genre: a creepy, rule-based horror story, highly refined and quality assured, but prospective readers seeking a thrilling experience should think carefully before proceeding.]In order to secure a substantial university life experience grant, Lin Yi and his roommate registered to attend a suburban university.A seemingly ordinary but slightly unsettling set of student regulations;Strange signs in front of the buildings and seemingly normal building rules;Mysterious figures threading through the campus under abnormal weather conditions…As the experience unfolded, more and more bizarre people and events emerged. To survive and leave the campus, Lin Yi had to navigate on the edge of the rules…[Note: The logical chain of this book was deduced by the author before it was written, forming a closed loop. All rules serve as clues, and all the inconsistent, mysterious occurrences will receive scientific (or quasi-scientific) explanations. There are no supernatural events or related phenomena (just kidding), you are welcome to try reading it!]