SorryImJustDiamond

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!!!

Donation link: https://ko-fi.com/sorryimjustdiamond

PS. Cover not mine, I just found it on google. If you are the owner and want me to take it down, then you can reach me in the comment section.

Reincarnated as an Imperial Prince

"I'm sorry, Tiffania. Could you repeat what you just said to me?" Alexander said, taken aback by the wish her sister wanted him to do.

"I told you, I want you to tutor me about engineering, preferably everything you know about the subject," Tiffania repeated in a soft tone of voice.

So she's not really joking, she wanted him to become her tutor. Alexander hummed as he pondered about it. Well, if Tiffania wanted to, who is he to refuse? In fact, this is a good chance for them to bond together as brother and sister. But before he does so, he has to ask one important thing to her.

"Tiffania, I thought your specialty is in social studies? Social studies and Engineering is a completely different fields. What changed your mind?"

"Well, brother, I just think studying engineering is cooler than social studies as you can contribute more to the country. Didn't I tell you before, I was inspired to study engineering because of you."

Tutoring Session