Death Guns In Another World - Chapter 1809 - 1601: Union with Eris 3 R~18

I’ve reincarnated as the reverse harem game’s villainess, the one and only step-daughter of the Eckart duke family.

Abandoned at birth in a humble stable, Shirone was raised by commoners—but he was anything but ordinary. Blessed with remarkable insight, he taught himself to read at a young age. A fateful visit to the city introduced him to the wonders of magic, igniting an unshakable dream of becoming a mage. Yet, beneath the city's dazzling facade lurked a ruthless social hierarchy, where power and privilege crushed those who dared to rise above their station. As Shirone uncovers the world's darkest secrets before even coming of age, one question remains—can he defy fate and claim his destiny as a mage in a world determined to keep him down?

Wang Zhong arrived in another world and got caught up in this world’s world war. His cheat ability was an overhead view similar to a real-time strategy game, which allowed him to see the field of vision of his troops! He immediately began micromanaging:“Move the machine gun position five centimeters to the left! Place the anti-tank gun in the woods on the right!”Three years passed like this.Wang Zhong looked at the marshal’s baton in his hand, then at the double-headed eagle flag behind the emperor’s envoy.“There’s an old saying where I come from, ‘Kings and princes, can they be born?’ Do you know this, Envoy?”

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.