Clearing an Isekai with the Zero-Believers Goddess – The Weakest Mage among the Classmates - Chapter 263: Demon Lord Battle 3

Jaden lived an ordinary life. This was the life that he had lived for several years now. This kind of life was one that had existed ever since the death of his parents.His parents died in an accident, leaving him an orphan. The moment that his parents died, his uncles came over and took over everything that was supposed to be taken by him.He tried going to court, trying to see if he could get back the wealth that belonged to his family, but due to the connections that his uncles possessed, he did not succeed.Completely abandoned by his relatives and friends that existed before the death of his parents, Jaden was left to fend for himself.He managed to get a job as a bouncer in a club. But as a coincidence, he ended up irritating someone that he was not supposed to offend. And with that, he was beaten and left in an alley to die.But it was at that exact moment that out of nowhere, he was bitten by a dog. Jaden could not believe it. He had never expected that he was going to die just like this. And even before dying from the wounds that he had suffered from the beating, he was going to be infected by rabies?But the strange thing that happened was the fact that after the dog bit him, a holographic screen appeared in front of him.[Congratulations on being chosen by The Bodyguard System.]And with that, Jaden's life changed completely.

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.

An editor at the prime of her life—and with maybe just a little too much free time—finds herself waking up in one of her favorite RPGs with no clue as to what's going on or how to get back home.This might be the part where others rejoice over getting whisked away to a world of wizards and magic, but she certainly doesn't think it's anything to celebrate about.After all, she woke up in the body of a small-time villain with some severe personality issues.

Being able to see into people's past has no real appeal for the teenager this story is about, letting him use it only as amusement and to show off when he was drunk.Never watch into someone's past beyond a superficial level.Never try to find out more than you should.NEVER. EVER. LOOK. INTO. THE. FUTURE.But everything changed the moment he was forced to look into the future, was forced to investigate a murder, and was forced to make the acquaintance of the victim's twin brother('s fists).The more time passed, the more it appeared that the primary reason for this murder wasn't a local problem, but a global one.This single, marred corpse was the beginning of a threat that would shake the world.(MC looses a screw when he enters the prison)BL, first-person view; MC is shuo (perhaps even a reversible couple); love interest falls in love first; both MC and ML are straight, mutual bending, Enemies to Lovers