Cthulhu Gonfalon - Chapter 867 - Vol V Chapter 227

Lucy Gray was a tech genius—until a stranger smiled, pulled the trigger, and ended his life.But death wasn’t the end. It was a recruitment.Dragged before a pantheon of ancient gods, Lucy learns his soul has been drafted into the Holy War—an eternal bloodbath in which Gods fight across shattered realms. Out of thousands, he was soul #4,000, chosen by Seraphine, the Goddess of Rebirth and Suffering.Now reborn in a dying world of Ogres, Giants, Beastkin, Dragonkin, and Elves, Lucy is a human among legends—a species exiled and nearly forgotten, for reasons that make him hated.Armed with nothing but defiance, sarcasm, and a bizarre ability to steal and master the powers of others, Lucy has one job: survive the impossible.The gods wanted a pawn.They got the wrong dead man.

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.

In life, the most important thing is appearance.To compensate for his lack of good looks, he worked hard for years to reach the peak.However, the reality waiting for him at the end was nothing but betrayal and despair.[The system has been activated.][You have obtained the ‘Handsome’ attribute.]On the brink of death, he gets a second chance at life.Now his goal is clear.[Quest Completed]Reward: Talent obtained through the ‘Handsome’ stat.[New Quest]Task: Become more handsome.“I will become handsome.”

One night she gets drunk and mistakes the most well-known Mafia boss for a Host* and intends to sleep with him.