MTL - The Manga of Ten Thousand Realms - Chapter 19

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.

Fate had never been kind to Ji Ning. Wracked by illnesses and infirm his entire life on Earth, Ji Ning knew early on that he would die as a teenager. What he didn’t know was that there really was such a thing as life after death and that the multiverse was a far larger place than he thought.

A lucky twist of fate meant that Ji Ning was reborn into a world of Immortals and monsters, of Ki Refiners and powerful Fiendgods, a world where Dynasties lasted for millions of years. A world which is both greater… and yet also smaller… than he ever could imagine. He would have the opportunity to join them, and in this life, Ji Ning swore to himself, he would never let himself be weak again! The Era he was born into was a Desolate one, but Ji Ning would make it his era.

"With this system, I'll become the world's greatest seducer! If it doesn't kill me first..." I was a nobody, a short fatty Otaku. Then a girl's voice popped into my head: [Seduce a woman within a month or die.]
"What the hell...how? I'm an 18-year-old virgin..."
[7+ looks only. No slam donkeys.]
"You’re forcing me to die!”

Facing annihilation, I had no choice but to join the international community of pick up artists. That’s how my boring student life became filled with craziness and womanizing. I just had one problem: "Why are these guys all insane?"

Pick Up Artist: One who uses specialized tactics to seduce women.

Additional Tags: weak to strong, supernatural, fantasy, funny, dungeon, face smacking, bloodlines, modern, harem, r-18, litrpg,magic, cultivation, martial arts, shameless protagonist, parody, satire, succubus, netori, adult, ecchi, sex, hidden gem, drama, wuxia, adventure, mature, school life, seinen, princess, billionaire, werewolves, xuanhuan, erotic, erotica, romance, revenge, polygamy, psychological, r18, 18, 18+, smut, hentai, comedy, light novel, alchemy, system.

*If you're wary of reading originals, I assure you that I'm a native English speaker and you'll find the writing here to be at a professional standard.

RELEASE SCHEDULE: 1 new chapter posted every day by 12 pm Est/12 am GMT+8. Bonus chapters don't have a set time, but if there are some pending, on per day is posted for 2 chaps/day total.

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The curtains to an epic of a continental power struggle are pulled open. There’s an entire empire in Dane’s heart!

Churches, tribes, prisons, forests, castles, graveyards, abysses . . . He controls the bases of all seven races in the fantasy epic war game, [Heart of Dynasty]; right before his eyes is the throne of a monarch!

Elf rangers pull your bows, the heavy-armoured knights are charging!

The Caesar Empire has collapsed. An era of war for the new ruler arises. The Kingdom sends endless expeditions; the Northern Alliance is unwilling to be excluded; the abyss and death begin to stir as they gaze upon the continent. Plots, tricks, religious wars. . . amidst these battles, only the victor can be called powerful!

Dane, holding a blade dripping with blood, says with bared teeth, “f*ck! Let me use my ass to see whether that seat at the top is comfortable or not!”

- Description from Novelupdates