There's Something Wrong With This Account - Chapter 375 - : 375, [Sword Sheath Upgrades, Divine Fire Appears]

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.

Luke a 13-year-old boy lover of all kinds of novels, series, and manga, dies and is reincarnated in Wednesday's world with above-average psychic powers.As he immerses himself in the world of outcasts and monsters, he will discover that it is not as simple as it seems. Luke in his new life is a descendant of the famous writer Edgar Allan Poe and must deal with an old family grudge.

The story begins with the last day of Yggdrasil, a popular online game which is being quietly shut down. Our protagonist Momonga decides to stay in his beloved game until the last moment, so waits for the forced logout. Unexpectedly, the server does not shut down and Momonga is stuck in a skeleton avatar in another world. “The powerful Overlord” needs now to discover the new world and face the continuous challenges that arise.

A man who was locked up to cultivate immortality finally achieved it, becoming immortal and reaching the very peak of existence.But to achieve immortality, he was forced to give up one thing he loved the most, and that was sex. He was a man whore before he was set on the path to cultivating immortality. He could seduce any woman during his time as a mortal.But now that he has achieved immortality and has omnipotent, he wants to go back to his old ways, finding pleasure in tasting different types of women.______________________A/N - This WN is focused on sex, there is a story but it is very slow, MC's focus will be on women since this is a sex story, as for the plot, it really doesn't matter, being omnipotent means no matter what the antagonists do, it is useless, but there will be something to look into when it comes to the plot as I don't want to make it boring to you readers.WARNING.This novel consists of extreme sexual content, for example, hardcore BDSM, sharing, public display, gang bang, corruption, manipulation, and every other kink that I want to put in.If you are uncomfortable with any of the following, do not read.