Billionaire's Contracted & Unloved Wife - Chapter 177

Oosuki Masato is an ordinary high school boy who is magically transported to an alternative world, but for some reason his doting, over-protective mother comes along as well.

Arren was reincarnated as an extra in the book world. However, unlike the others, Arren was determined to play his role well and be the best extra ever.He was successful until that one unfortunate night that would make his second life an unpredictable one. He also began to doubt that perhaps... He wasn't the useless extra he always thought he was.R18.OMEGAVERSE/ BL

Traveling into the world of Genshin Impact—and of all places, ending up in Snezhnaya, which hasn’t even been released yet.A catastrophic start… but luckily, he received the gaze of an Aeon.With a single punch, he shattered a Fatui Debt Collector.With three punches, he brought down the Captain.As the knight’s helmet in the Captain’s hand crunched beneath Su Ran’s palm—The voice of the Tsaritsa rang out in sorrow:“Please… spare him.”Su Ran smirked. “Beg me?”The Tsaritsa whispered, “I beg you… please, spare him.”Looking up at the familiar figure upon the throne, he finally loosened his grip.~-------visit my pa treon for 30+ advanced chapters:pat reon .com/YonkoSlayer

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.