One Piece: I am Imu - Chapter 312: Annihilation Unleashed

Her – a glutton without troubles or worries who crossed over and became a young fat chick with a deep vengefulness.

Him – a young master of the number one power; a two-faced man with elegance and charming, good looks; he is the chosen one of the former saint god and a man who will only bend his back for her alone.

This domineering crossover’s slogan is, ‘Don’t touch if it is this sister’s, put it there if it isn’t this sister’s!’

…watch how the Domineering Glutton and the Two-Faced Venerate Emperor create sparks as they meet and collide, stirring the whole Spirit Treasure Continent into turmoil, how they fall for each other and how they kill each other, how life and death severs love.

- 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.

“If I told you about the darkness inside of me, would you still look at me like I'm the Sun?”******Annalise's life changed the very night she was married off to the Dark Lords who resided in the Cursed Castle. She was offered to them as a sacrifice to save their Empire.No one knew anything about those residing inside the Cursed Castle except that there were three of them, all men, and they all were very powerful.There was a dark force invading the peaceful lives of the people of Seelie Empire, people were disappearing and unseen things were happening. And the High Priestess confirmed that the Seelie Realm would need the help from the Dark Lords to win this battle against the unknown.Annalise ended up becoming the pawn as the only unmarried girl with royal lineage and the title of a Princess. To show their sincerity about the treaty, the royal family offered her hand in marriage to the Dark Lords, and to everyone's surprise, the Lords agreed. But they had a condition - she needed to marry all three of them!To save her Empire and people, Annalise agreed to marry all three Lords only to find that none of them showed up at the wedding.How was Annalise going to handle her married life, and her three husbands who were not only handsome beyond words but also more powerful and mysterious than people thought? Especially when they had a great battle to fight!

Blue Star has entered the extraordinary era, everything is evolving, and monsters are rampant.

Humans awaken their star souls in evolution to fight against raging monsters.

Zhou Xuan, who was doing odd jobs in the Demon Town Tower, accidentally awakened to an unscientific sign-in system.

Sign in on the ancient desolate beast and gain the power of the wild. Sign in on the weed spirit, and the star soul evolves into the nine-leaf sword grass.

The thousand-year black turtle, the ten thousand-year sea king, the immortal true phoenix, and the sky-swallowing dragon have all become the targets of his registration.

There are countless monsters in the Demon Suppressing Tower, Zhou Xuan signed in silently, and if he was not careful, he would be invincible.