I Hate You, Devil! - Chapter 266 Officially tainted

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.

At the beginning of the game, there is a small broken boat, and the whole family lives on the boat, which is leaking from wind and rain.

Huo Xi didn’t panic at all, rowed the small broken boat vigorously and started to make a fortune. If you don’t pay attention, you will become a rich man in the south of the Yangtze River.

It’s time to return to Beijing to take revenge and regain your identity. Take mine and return it! Eat mine and spit it out!

A black-bellied person: It’s lonely alone, why don’t you take me with you?

Huo Xixing’s eyes widened: Hurry up and hand over Xie Jin and leave! Don’t delay my sacking.

A black-bellied person: I won’t leave. How dare you play tricks on the grace of saving your life? Since then, you should promise each other with your body, be like a cow or a horse, and let yourself be driven.

Huo Xi: Huh? Set sacks together?

A black belly: go!

- Description from novelbuddy

A girl Alicia lived as an orphan in a world of sword and magic Ciel.

One day, she learned that she was an “otome game’s heroine”. Even her parents’ death was simply a part of the scenario. Alicia judged the heroine’s setting as 「nonsense」and discarded it decisively. She introduced herself as adventurer 『Aria』, gradually mastered multiple weapons and magic, and grew to become the 「Ash Crowned Princess of Slaughter」! But, by accepting a request to guard the “villainess”, before she realized it she got dragged into the stage where nobles quarreled against each other――？

「I am “I”. I’m not a game character!」

Create weapon! Train your body!

Survive the fighting against powerful enemies and smash apart the otome game!

A sublime and exhilarating other world battle fantasy with charming fighting heroine!

Kurono Maou is a high school student who is sensitive of his sharp eyes and bad expression. No girlfriend but gifted with friends in his own way, he had been living a peaceful life.