Eroge: I can Travel To The Ancient World - Chapter 269: Gathering The Clues of Murder

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.

Just like how everyone adored heroes in their childhood, a certain young man adored those powers hidden in shadows. After hiding his strength and living the mediocre life of a mob character by day while undergoing frenzied training by night, he finally reincarnates into a different world and gains ultimate power. The young man who is only playing at being a power in the shadows, his misunderstanding subordinates, and a giant organization in the shadows that gets trampled…. This is the story of a young boy who had adored powers in shadows possibly eventually reigning over the world of shadows in another world.

In this school fantasy story set in the distant future, creatures contaminated by pollution have overtaken the land, forcing humanity to live in isolated mobile cities called Regios. One such city named Zuellni is a self-contained school in which freshman Layfon Alseif has just enrolled. Layfon reluctantly joins the 17th Military Arts Platoon led by the third-year student Nina Antalk and embarks on a series of adventures.

An Xiaojiu stepped on the soap in the bathroom and fell directly to ancient times!

Crossed, or with Taobao, An Xiaojiu determined to become the ancient Jack Ma!

Just when I first wore it, I met grandma, grandma, and auntie. She either wanted to kill her or sold her!

These are nothing, we have Taobao! The ancient broken bowls can sell a lot of money on Taobao. We also double the eleven in ancient times!

I was thinking of being casual and doing myself well, but I was pregnant while unmarried. Only then did An Xiaojiu know how lowly the status of an ancient merchant girl was!

Low enough, she won’t be recognized by her future mother-in-law for buying one get two!

The secret of identity, whose conspiracy?

Love chase, whose life and death?

Looking back, my affection remains unchanged, can you still hold a sword to protect me?

- Description from Qidian