Dungeon Diver: Stealing A Monster's Power - Chapter 446

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.

"There was a time in my life where I struggled to breathe. A time where I felt suffocated everyday, but then I met you."

-Turning the gears of fate.

A drop of ink can penetrate the walls, even the walls you took too long to build.

After losing her first love due to a traffic accident, Ibuki Sumire transfers to Tokyo. She wanted to escape, to run away from everything that happened. To start over in a place that didn't have him. But a series of clues lead her to investigating the case behind the accident.

In that place she learns about the masks people wear. The masks people wear to disgui se their feelings. Sometimes you have to look past what you see on the surface.

There she meets him, the person who helps her move forward. But Sumire quickly learns how alike they are. His cold personality is different than the kindness she is used to. However, he is the only one who understands her feelings.

It keeps going around in circles, like a drop of paint. Round and round - an endless stream of pain and lies. But, that stream ended the moment she laid her eyes on his paintings.

Such rich and vibrant colors, it felt like his emotions exploded. Yet, in the corner of his studio, she found it. The real him, a sakura painting of two people walking hand in hand.

A gentle and sweet feeling, something she has never felt before.

[Commissioned Cover by: Vatarison]

When I cleared the final chapter of a game that was a national failure, I became an unnamed side character in it.

A non-standard, unmeasurable, EX rank supporting character.

The protagonist is reborn in the world of the game he loved so much – [Dungeon Brave Souls]. However, he was reborn not as a hero who adventures with the heroine while flirting with her, but as a villain who steals the heroine and drives the world to extinction.

Why in the world should he be reborn as a villain who ruined his favorite game? The protagonist is in despair, but he still decides to live his second life freely, using his knowledge of the game. However, the reality is not as good as he expected. Events that should not have happened in the game, scenario changes happen one after another…!

The villainous character crushes both the demon king and the heroes. A heroic tale of evil supremacy!