The Village Girl Who Jinxes Her Husband Is Filthy Rich - Chapter 1887 - : Little Black Bird

The real world merged with the game world, monsters came to the world, and herds of beasts raged in the city.

In order to eliminate monsters in the dungeon, everyone who has player qualifications has to hunt monsters, choose a career, keep getting stronger, and protect human cities from being destroyed.

Elemental mage, fire and ice, destroy everything! In the priesthood shield battle, Mount Tai collapsed in front of him and remained unchanged.

However, Han Yu, who had high hopes, chose the summoner profession that even dogs would not choose.

“Summoner? Is there anyone for this profession? Don’t dogs even play?”

“Who will team up with a summoner, let him brush slowly by himself. The two summoned creatures are not enough for me to step on.”

“I heard that his talent is not bad, why can’t he think about it so much, and changed his job to a summoner.”

Until one day, Han Yu was drinking tea while standing behind Huyun Leopard, which was the size of a mountain, and the giant skeleton hand that emerged from the ground gently pinched the boss to death.

Only then did people discover that Han Yu’s summoned objects would not disappear, and could even be cultivated continuously!

- Description from novelbuddy

In a world where kingdoms rise and fall, a seasoned player unexpectedly finds himself transmigrated into the very game he once mastered—Caldera. However, his new life as a ruler comes with a crushing twist: severe debuffs and harsh restrictions on his talents make survival nearly impossible. Against overwhelming odds, he fights tooth and nail to carve out a legacy. Despite his brilliance in strategy and marvels in combat, failure becomes his ultimate fate.

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.

「Shimizu-san, you dyed your hair black.」「Ah, yes.」「Why did you dye it all of a sudden?」「Because…yesterday…」Shimizu-san, who sat next to me and had dyed her hair from blonde to black gradually lowered her voice, slightly blushed, and laid her face down on the desk.