DxD: Building A Demon Clan From Scratch. - Chapter 2: Just a Devil’s Lazy Mind

A young man, with a keen mind of medical knowledge and skill, steps into a vibrant buzzing city for the first time.How would this young man face the challenges of love and hate, of family’s vengeance, and the temptation of beautiful ladies?

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.

Mu Mu transmigrated in the novel that had the plot like a fraud marriage with a man dressed in women’s clothing, rich man regretting and taking revenge after rebirth.

The body he had transmigrated into was none other than that of a scumbag who was a fraud man dressed in women’s clothing. He was also the one that the protagonist took revenge against.

And now, he was standing at the door of the Civil Affairs Bureau with that damn protagonist, holding the newly-released marriage certificate in his hand.

Mu Mu agitatedly raised his head. He saw the fierce and sinister expression on that damn protagonist. He was twitching the corners of his mouth, showing a grim smirk of wishing to eat his blood and flesh.

Mu Mu’s legs were weak and his eyes turned dark. He was trembling: “My good brother, why don’t we get a divorce?”

- Description from Novelupdates

When Yuan Zhi met Song Jiyun for the first time, Song Jiyun was conspiring with her brother-in-law to take over the family business;

When Yuan Zhi met Song Jiyun for the second time, Song Jiyun was planting and framing others with her breast brother;

When Yuanzhi met Song Jiyun for the third time, Song Jiyun’s breast brother was no longer by her side, but she was winking at his good brother…

Scholars can bear it, but he can’t bear it. Yuan Zhi decided… to feed the tiger with his body, and took Song Jiyun, a demon girl!

- Description from novelbuddy