Wortenia Senki (WN) - Volume 2 Chapter 32 (Decisive Battle 4)

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.

A university student is stuck working on coursework late into the night due to some unfortunate circumstances. After reflecting on the choices she has made so far in her life and looking forward to what she can do once she is finally able to really get her life going, she starts to make her way home.Unfortunately for her, that life is abruptly cut short, and she finds herself in a new world as a new person, one with a fluffy tail at that. She must come to grips with her new reality, no matter how bad it may seem. Luckily, a clumsy kitsune goddess seems to be looking out for her.This little kitsune will go on a journey to improve herself as she learns more about the world she now lives in, struggles through romance, and puts her life together.

Inside the dining room.

Fangzheng: Hello, I’m on a blind date.

Sister Yu: A blind date?

Fangzheng: To make a long story short, I know you are here to deal with your parents. As long as we make it clear, we can go back to our respective homes.

Sister Yu: Do you know who I am?

Fangzheng: I don’t know much, so what do you say? Continue to photograph or?

At this time, a waiter came in and bowed awkwardly to the two of them: I’m sorry sir, I made a mistake, this is not the room you are looking for! Your blind date is next door!

Fangzheng: ….

- Description from novelbuddy

After being killed, Xu Turan was given a system and got pulled into a certain thriller romance novel. There, she became the crucial female supporting role who seeks death. However, on the first day of transmigrating, her system was urgently recalled for repair as it was aging.

As their farewell was imminent, the system was worried about its new host so it repeatedly reminded Xu Turan: [Your role is to be a supporting character who is always seeking death. You do know what that means, right?]

Xu Turan recalled her rich experience of doing just that in her previous life and she replied affirmatively with absolute confidence.

So the system withdrew with its mind at ease.

After a few days, the system that had been away for repair finally returned. When it looked at the situation, it almost malfunctioned: [What are you doing?!!]

Xu Turan, who was busy arguing with the Evil God, answered without thinking, “I’m doing what you asked me to do – trying to find ways to die.]

System: […?!]

- Description from Novelupdates