The True Mistress Has A Thousand Hidden Identities - Chapter 108 - Love At First Sight

9-Star Talent Awakened—Primordial Justice.Lex, a 'D' rank hero, struggled while trying to find a job after the sudden disappearance of the gates, dungeons, and towers where monsters used to come out.Dying by his lovely wife's sandal, who turned out to be the protagonist, Lex got reincarnated in a game-like world ruled by the Various Court's, which govern the Monarch's and make rules. In such troubling times, can he become the one who makes the rules, or does he have to bend them?A/N: The main character is mainly a selfish villain, so if you're here for burning town's and pillaging villages, you're in a perfect place. It will take time to develop his character, but he'll get there.

Protagonist travels between different anime worlds to right wrongs and uncover his reason for being along the way.

- Description from Novelupdates

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 man was about to commit suicide and decided to search for a way to die on the internet, but then he found an odd site that asked a lot of questions and had a point based system that allows you to create skills for a character. He took interest in it, and when he was done setting his character, he was asked, “You will now be transported to a world with the settings you chose. Coming back is not possible. Do you still accept?” Without thinking much of it, he pressed YES and found himself in another world with the skills he chose to have.