Youkoso Jitsuryoku Shijou Shugi no Kyoushitsu e - Volume 12, Prologue: “Operating Behind the Scenes”

“I beg you, please teach me how to pick up female angels!!!”
Pleaded the twelve-winged angel.

“Teacher!! How can I fool more people into my sect?”
Asked a devil in the devil world.

“Do you know how to save the family cat that died last night?”
Someone in the sky is too embarrassed and asks me quietly.

“All the angel, all the big deity, please I am not God, I am really just a summoner….”
I said painfully.

This is the story of a poor boy and how he becomes the greatest summoner who dominates the six worlds because of an accidental acquisition of Dimension.

- Description from Novelupdates

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 his last life, Xue Yan had been a powerful minister all his life. When he returned to seven years old, he didn’t want to be any more. In the same way, he has all the power in the world, but his family cannot end well.

Unexpectedly, his father suddenly picked up a baby girl, saying that he had raised him and would be his daughter-in-law.

The daughter-in-law is all good, but not good at all. She can’t be allowed to sneak out alone.

Otherwise, she will bring you back a great general this time, and next time she will bring you a different surnamed king, and even the queen mother of the dynasty will be rescued…

Not long after, I’ll bring you a little emperor again…

*

Jiang Yue, the supreme commander of Area A in the end of the world, actually dressed in ancient times and became a three-and-a-half-year-old girl.

No matter how she lived her life, it was just that her future husband didn’t know what was going on. Every time she kindly rescued a person, he would be disgraced.

(Sweet pet text, one-on-one, double clean)

- Description from novelbuddy

An underprivileged prodigy, a cruel, ruthless world, and an epic story of battle and conquest. A young man with an exceptional inheritance leaves the small, rural city from which he hails on a journey to find the girl of his dreams. He defeats countless prodigies, sweeps through all forces that dare to stand in his way, and progresses step by step toward the pinnacle of all the worlds!
“I’m not targeting any gods in particular. All I’m trying to say is that all gods are trash in my eyes!”

- Description from Novelupdates