Naruto: Escape From Konoha - Chapter 246 - 239: The Ninja and the Princess

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.

“I'm on the hunt for someone special, someone who would howl at the full moon with me. And you, my dear, seem to check all the right boxes,” Thorin tried to seduce Riona with his mesmerizing gaze.“Not in this lifetime, not in any lifetime.” But Riona couldn’t stand the sight of that smug face. What did Thorin hope to gain from a fangless vampire who couldn’t even turn into a bat, anyway? There must be something seriously wrong with the brain of that infuriating Alpha werewolf.***Since their parents died, Riona Kahler and her brother have been adopted by the King of Eira, who treats them more like overworked houseplants than a cherished family. As the only vampires in Eira without fangs, they're outcasts among their own kind, toothless and ridiculed. Riona's spirit remains unbroken until her brother falls ill due to the palace's cruelty. Determined to protect him, Riona vows to escape, but there's only one way to do that.Thorin Klein is one of the most famous Alpha werewolves, renowned not only for his charming looks but also for claiming the Alpha title at the tender age of thirteen. Despite his howling success, his mother’s powerful werewolf clan, the Klein, never acknowledged him because his father went rogue. Determined to prove his worth to the Klein clan, Thorin believes he has finally found a potential solution.Though Riona couldn’t stand being around Thorin for more than one second, Riona realizes that marriage is their only path to achieving their goals. It's a love story that bites and barks in all the right places.#werewolf #Alpha #vampire #fromslavetoqueen #enemiestolovers #strongFL #contractmarriage

Being a nobody from a poor district of the Federation, Nick is a sixteen year old boy just trying to find his place in the world. When he finally gets his shot to enter the Beast Domain upon turning sixteen, he jumps at the opportunity to finally make something of himself — to carve out his own future.His goal? Survive. Hunt. Earn enough money to finally support his little sister back home and bring them out of poverty.But to a naïve young boy like Nick, the world is far more sinister than it seems — leaving him no choice but to adapt or die.To a poor young man like Nick, though, there was only one choice he could make.Follow Nick as he navigates these obstacles and carves out a future for himself and his sister, all while uncovering the various mysteries that shroud his worldview in darkness.

Crossing to One Piece world, he became Roger’s younger brother.

Unexpectedly, Gol-D-Roger who was in his fifties had a teenage brother. But he was so weak.

Fortunately, at the age of sixteen, he actually found himself with a possession soul system.

He had attached to the master IP man, also to the White Phoenix and to Ge Nie with his strong ability of the Hundred Step Flying Sword.

If you think that he can only Purchase these? Then you’re wrong!

Pain, Itachi, Ichigo Kurosaki, as long as there is money, any soul can be Purchased.

- Description from Novelupdates