Diary of Guarding Monster Girls - Chapter 69 First Life-and-Death Crisis (1/3)

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.

“O, Hero!” With that cliched line, Kazuya Souma found himself summoned to another world and his adventure–-did not begin. After he presents his plan to strengthen the country economically and militarily, the king cedes the throne to him and Souma finds himself saddled with ruling the nation! What’s more, he’s betrothed to the king’s daughter now…?! In order to get the country back on its feet, Souma calls the wise, the talented, and the gifted to his side. Five people gather before the newly crowned Souma. Just what are the many talents and abilities they possess…?! What path will his outlook as a realist take Souma and the people of his country down? A revolutionary transferred-to-another-world administrative fantasy series starts here!

Transversing the wizard world, bound to the Wizard's Life Simulator.

[Do you want to start the life simulation?]

[Simulation has ended, please choose your reward!]

[Retain Realm] or [Retain Technique]

A wizard simulator, blasting through the world from scratch!

Starting from the subcontinent, dominating the Wizard Realm and endless planes.

...

[Wizard Style] [Simulator] [No Main Character Bullying] [Decisive and Ruthless]

……………………………………………………………

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Elementals, Enhancers, Beast Tamers, Artifact Nurturers – These four pathways define the magical world of Arcanists. But Finn, a former university student from earth, wakes up in a body treading a whole different path…A forbidden path: The path of a Soul Mage.Soul Mages are the ultimate parasites. They lack the ability to use magic themselves, but instead, wield the power to assimilate the mana-saturated souls of the dead.From every Great Arcanist that once lived, to every Calamity Beast, to every Mythic Grade Spirit Artifact… So long as they were dead, they were simply chaotic souls waiting to be claimed.​But this kind of power does not come without cost. Madness, frenzy, mania, innate wills and primal desires of assimilated souls threaten to drive Soul Mages to total corrosion.In this new world, ​Finn finds himself thrown into the deep end, waking up as a Vessel already housing a full Parade of Chaotic Souls. Now, his body is a battlefield. The souls demand immediate payment, stacking Soul Debts that steal his senses, his consciousness, and his very humanity.​But yet… it is this same overwhelming corrosion that causes the ultimate truth and uniqueness of his soul to surface…