One Piece: Don't Worry, I'm a Doctor - Chapter 57 - : This? It’s for Weaklings

‘I must entertain the masses.’ This was Jester’s lifelong goal.After leading 12 different lives as a Hero, King, Sage, Jester, and more, all he wanted was to mock the king and his court.Unfortunately for him, his majesty didn’t appreciate his vicious jokes.Jester died, trying to flee for his life. But death wasn’t the end for him.For his 13th and last life, he triggered the Archetype System and reincarnated in a world of magic and perils.[This is your last life. Don’t waste it!][Welcome to the world of Archetypes!]Oh, before I forget, soon, players from Earth would flood into his new world.But even players won't escape from his clutches! Even people from the Earth will be tamed!

Catastrophe erupted, it was the end of the world.

Survivors were surrounded by the impregnable wall, a new order was established…

The desire for power, faith, and darkness pervaded each other, layer upon layer of brands imprinted in every corner of the heart.

The virus wreaked havoc, were these humans’ true colors?

“I unexpectedly survive, I want to live.” –Du Dian

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.

This story is about a god level player, Li Cangyu, who returns to the game Miracle after being away for several years. The story explores him playing the game and setting up a team in an attempt to finally win a trophy in the Miracle Professional League.
E-sport God Series 1 “The Strongest God”
E-sport God Series 2 “God Level Summoner”
E-sport God Series 3 “The King’s Return”