Huh? Isn't this an adventure kingdom building game?! - Chapter 16: The Storage Bag of the Flame Rat Leader

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.

Possessing Divine Skill defying the Heavenly Gods, equipped with unmatched medical expertise.Under the name of Martial God, guarding the world.In this colorful city, create the supreme legend.

For the crimes he commited, Theo was executed by the exile to the outlands, beyond the limits of human civilization, where the S-rank monsters reigned supreme.Yet, rather than feeling despair, guilt or anything else... Theo was excited.He had no memory of comitting any of the crimes he was sentenced for. Or, to be more precise, he had no memory of doing anything in this world other than sitting in the prison-coach as it drove to the edge of the civilization.And how could he not, with the system prompt hanging out in the corner of his vision, promising to activate only once he set foot in the outlands?Turn the world into blocks... and mine them out. Craft whatever your heart desire. Construct, automate, explore and exploit!But when you hear the boss music kick in...Do you run, or do you stand your ground and fight?!And what if, while you play minecraft... Others play game of thrones?

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.