MTL - Naruto Lineage Theory? Trash - Chapter 752

The daughter of a duke, the stuttering Maximilian, married a knight of lowly status at her father’s coercion.

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.

“I thought I was dead, but when I opened my eyes, I found myself reincarnated in an abandoned RPG game. I intended to gather the heroes I had trained to form a guild once again, but…“I thought I was dead, but when I opened my eyes, I found myself reincarnated in an abandoned RPG game. I intended to gather the heroes I had trained to form a guild once again, but…Hmm… it seems all the heroes have completely lost their minds.”

In history, the most notorious Holy Knight! Corrupt Light! Holy Sinner! Blasphemer! The Irreverent! Wright has many well-known titles within the Church of the Holy Light.Angel: “The Goddess tells us to guard against fire, theft, and Wright!”Evil God: “Could you stop targeting me alone when you fleece us?”Evil Dragon: “He not only extorted my money but also abducted my precious daughter!”Devil: “Hell is still too kind and pure for Wright to handle!”Yet this man, whom the Goddess of Holy Light considers a thorn in her side, has become the world's most terrifyingly powerful Holy Knight!!Wright: “Do you believe in the light?”