King Shura - Chapter 24. The Young Lord of The Heavenly Demon Church

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.

Luna Lethal, a name synonymous with fear and power, ruled both the underworld and the elite circles of society. Orphaned young, she rose through treachery to become a master of manipulation and skill. Yet, her reign ended in betrayal—a laboratory explosion claimed her life. To the world, her death was a tragedy; to her enemies, a cause for celebration. But Luna awakens in the body of Aurora Smith, a neglected and ridiculed child despised by her adoptive family. Stripped of her former strength but not her will, Luna faces a choice: seek revenge for Aurora’s mistreatment or forge a new path. As her sharp mind and unyielding spirit transform Aurora’s life, shadows of Luna’s past resurface. Loyal followers sense her presence, while old enemies seek to destroy her again. Torn between vengeance and a fresh start, Luna must confront her identity. Is she still the Devil of the underworld, or can she find peace in a second chance at life?

One of the rarest type of magician exist in the world. Who would able to underestimate summoning and ordering a mighty pheonix, or summoning an invincible dragon? Of course, none.

To master the path of summoning, only those born with an innate talent and strive to learn the path of summoning magic might be capable of achieving and master the powerful magic.

But not for Lyan Arcanium Evocatore. After succeeding defeating his lifetime quest of saving the human world by offering his life, the great incubus's wish of living freely got granted and he wakes up at a parallel world with 8 powerful spirits contracted with him and a summoning grimoire.

[The gods have granted you the Grimoire of Summoning: Creatures of Love]

[You're capable of obtaining the summonable monsters by having affectionate intercourse with your romantic interests]

[The Grimoire is chosen in consideration of the host's former occupation as an incubus]

“Intercourse!?”

But not only the grimoire, The other problem is...

-You are?

-Whoa... What with this weakling?

-It seems that you're my master, nice to meet you

-So you're the forementioned servant, huh!?

-B-Big bro! Y-You're the summoner!

-........

-Boy, you look delicious

-Um... Where exactly are we?

“How should I know!? And why the hell should I sleep with women in order to get my summonable monsters!?!?”

Follow the summoner Lyan as he collect monsters, get dragged into different kinds of war, became the greatest feudal lord, battling the goblin king, facing the dragon tribe, and opposing the evil god followers!

One of the King of Kings Series

Set on a giant, almost finished bridge between Sadogashima and Niigata. Abandoned by the government, the bridge, and the giant man-made floating island at the center, has become a city of criminals and societal drop-outs.

Set in the same world as Durarara, but 15-20 years later. There is almost no overlap between Etsusa Bridge and the other novels.