Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Volume 17 Chapter 51

The super cowardly me installed Super Coward Mode, and the terrifying extraterrestrials started to look cute.“Eating the flesh of an extraterrestrial deity? You’re not human! Ew!”“Even withstanding mental manipulation? What kind of monster are you!”“Enslaving an extraterrestrial deity? You must be out of your mind.”…And then, the reactions around me became strange.

He called me his ruin. Then he made me one.Alpha Shiloh's rejection wasn’t just a scar—it was a betrayal. He left me shattered. Broken. And I had to rebuild myself in silence.I almost forgot the way his touch once burned like salvation.Now he’s back.Not to beg forgiveness. To bargain. A deadly mission, he says. He promises freedom.But then presence ignites my wolf into a frenzy. She thrashes, desperate to claim him again. But I remember the coldness in his eyes when he exiled me. The way the pack turned their backs as I crawled into the wilderness, half-dead and wholly broken. Hate simmers hotter than desire.Yet here I am, bargaining with the devil who shattered me. Every moment we share is a lie. He doesn’t know about the shadows I’ve fed, the truth I’ve buried.Or the child.One whisper of its existence, and the pack will paint the forest with my blood.But the closer we get to completing his mission, the harder it is to hide… from him, or from the part of me that still craves him.Freedom has a price.So does vengeance.And I’m not sure which will destroy me first.

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.

In a world where imagination births power—called uncos—Amari has none. Branded cursed and cast aside, he escapes slavery only to find himself in a society ruled by celestial artifacts, divine oppression, and fractured ideals. As gods wage silent wars and cities shimmer with false hope, Amari must navigate a reality where strength is everything—and he has none to claim.But chains don’t just bind the body. They shape the soul. And Amari’s soul is beginning to stir.With nothing but grit, loyalty, and a defiant heart, he walks the line between myth and mortality, hunted by secrets older than the stars. In a tale of betrayal, survival, and the quiet power of choice, Ragnarök, Eternal Tragedy asks: Can a boy without magic rewrite the fate of gods?