Dictator From Outer Space - Chapter 7: Silla Energy

In a Fantasy world in which a young girl with the Divine Protection of the Hero battles against the Demon Lord. In that world, Red, the elder brother of that young girl Hero, possessing the Divine Protection of the Guide which only grants a high initial level, fought in the initial party of the Hero.

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.

Because of his own carelessness, Duanmuhuai crossed into the world of the game “Xinghai OL”. Starting from a small core cabin, Duanmuhuai crossed the galaxy, traveled to countless worlds, awakened the power that had long been dormant, and fought against the hidden depths of the universe. The threat to dominate the galaxy!

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- Description from novelbuddy

In a world where succubi are half-human, half-monster creatures, they depend on the life essence of human men for sustenance. However, they are unable to extract it themselves as they are not considered attractive by human men. The succubi are responsible for ensuring the safety of humans, they have established large security enterprises over the years.Therefore, it is the duty of human women to provide them with this essence. One fateful day, a virus outbreak occurs in a research facility on the continent of Ocezoria, transforming the infected individuals into a type of undead beings.Join Andreas Kappel, an 18-year-old young man who, prior to the virus epidemic, was attempting to secure a job interview at an essence farm, as he embarks on an exploration of this unique universe.