Anime Crossover : Living in the Heart of Tokyo - Chapter 133 Sakura

Lynn traveled to a magical world similar to the European Middle Ages but possessing magical powers.

Here, magic can affect and control elementary particles.

So…a scientific theory is a magic formula!

Wizards called spellcasters who are actually scientists, under the siege of the Holy See, struggled to explore the truth of the world, until the arrival of Lin En, which set off a renaissance of an alien version…

(PS: The 2 million-word work “Hogwarts Bloodline Wizards” has already been completed, and the quality is guaranteed!)

- Description from novelbuddy

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.

After signing the share transfer of the Bai company, Bai Weiwei who has a congenital heart disease got betrayed by her adopted sister she always loved along with her trusted bodyguard. Shocked, betrayed, and worried for her father made her unwilling to die, and her resentment actually let her bind with a quick transmigration system. Completing the task means that she will be able to increase the number of days she can live, and she will be able to get revenge on her white lotus sister and the unconscionable b*stard bodyguard. CEO, Emperor, General… Supreme Immortal? All of them turn to a love-sick waste who bowed before her skirt.

Just… why is this unlucky star of a wooden fiance trying so hard to chase her? Stop sucking my life force already! Our marriage is only for business! I want to break the engagement!

Ye Yuxuan: “I will never let go of you.”

- Description from Novelupdates

On the engagement night, after being betrayed by her fiancé, Ye Shu decisively turns around to marry Shen Shaochen, the number one abstinent male god of Jin City, in a flash marriage.After marriage, she thought that just by quietly giving birth to an heir to the wealthy family, all would be well.Little did she know that serving the great demon king would be so frustrating.Quit smoking, quit drinking, quit gaming!Ye Shu silently grits her teeth and endures, and on the day the baby is born, she brings the divorce agreement, “Mr. Shen, the task of bearing a child is completed, please sign the divorce.”Shen Shaochen: “Mrs. Shen, the agreement didn't say that only one child would be enough...”Ye Shu begs for mercy, “Husband, I was wrong! I won't divorce anymore.”(1V1, both male and female leads are clean and committed.)