Ancient Fiend Dragon Emperor - Chapter 516 - 513 Boasting Should Be Appropriate to the Occasion

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.

Akiyo Oshima was a successful man, with wealth, status, and a perfect life. However, by giving in to the temptation of betrayal, he awakened the wrath of the one entity he should have never angered—his girlfriend, Sayuri, who turned out to be Death itself.As punishment, Sayuri cursed him. Akiyo was stripped of his identity, his form, and even his gender. In every world, a new body would be created for him, allowing him to inherit memories and a random aspect of personality. Now, he must live as Shizune Accursed. But her new existence was far from a second chance. Trapped in an endless cycle of reincarnations, Shizune awakens in different worlds, with no control over her fate. And in each of those worlds, there's always a Yandere she has met or will meet, whose obsessive love inevitably leads her to her death—whether by possessive love, madness, or simply the need to have her all to themselves.Condemned to die over and over in the arms of those who love her in twisted ways, Shizune, in an attempt to understand the burden of manipulating others’ feelings, finds herself on a dangerous path. Will she survive and break this curse? Or will she remain forever trapped in a cycle where love is uncontrollable and always leads to death?Whether in a fantasy, futuristic, or modern world, where anything can happen, the question remains: who is really on Shizune's side? Are they allies she can trust, or just more Yanderes waiting for the perfect moment to seal her fate? Among men and women, even within her own family, Shizune will need to figure out who she can truly trust… before it’s too late.

Megumi Fujiboma, a boy who met an untimely end, awakens to find himself reincarnated as the head of the prestigious Fujiboma household, a branch family of the revered Boma clan.From the moment of his birth, everyone eagerly anticipated the growth of this remarkable heir. However, their enthusiasm quickly faded when Megumi was revealed to lack external abilities, and was declared unfit to become an exorcist—one of those destined to drive the world away from darkness.Yet, Megumi was not one to be easily defeated. He possessed a powerful binding system that equipped him to transform his circumstances far sooner than expected.[Target successfully bound]********[Talent has successfully awakened: Grade One Fire Talent][Receiving tenfold the rewards]

Intellectual Villages are old fashioned rural villages recreated with cutting edge technology. Those villages attract the Japanese monsters known as Youkai.

The high school boy Jinnai Shinobu lives in one of those villages and has a Zashiki Warashi living in his house. He tends to run across Youkai with unnerving frequency and this often leads to trouble for him.