White-Robed Chief - Chapter 1145: Beg Forgiveness

A world where the [Demon King] was defeated by a [Hero] that came from another world. People carelessly forgot about their fear of the [Demon King] and of monsters, living in peace.

In a forgotten and run-down cave in the mountains, a new monster that should not have been born was given birth.

The monster’s name was the [Black Ooze]. It was nothing exceptional other than its black color, an ordinary slime.

However, this slime had the special characteristic of being able to take the abilities of the living things it swallowed. It preyed on an insect that had paralytic poison, as well as other animals. Following that, it attacked a human, obtaining his knowledge and [Desire].

Before long, the monster established its target as the female mage that came to explore the cave.

This world still wasn’t aware.

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.

“We campaigned for a century, prevailing against all obstacles. The sole exception being the Marshal, who could not be defeated…… the military fame of the Marshal endures, yet the Alliance has been utterly crushed. From this day forth, all the glory belongs to the Marshal, himself.”

As the Alliance government that stood for a thousand years crumbled, the Galactic Empire rose into power. The supreme military leader of the Alliance, Gavin Silla, refused to surrender and chose to fight to the death for his nation.

“Your Majesty, in the Age of Old Earth, mint blossoms were believed to be an omen for reunion. In the language of flowers, it means—

—hoping to see you once more.”

- Description from Novelupdates