Naruto System in One Piece - Chapter 438: Leming and the 3rd Hokage

In the land of the Xia Kingdom, every human being is born with what is known as a ‘resonance’, either to a specific element or a powerful, mythical beast. Unfortunately, Li Luo was born with an incredibly rare condition known as a blank resonance – as the name suggests, he doesn’t have one! Normally, this would be utterly crippling, but at least he has the advantage of being the young master of the mighty House Loulan, one of the five Great Houses of Xia. Unfortunately, his parents, the powerful masters of House Loulan, have gone missing for many years, and the other Great Houses are beginning to eye their holdings quite hungrily. For that matter, plenty are also eyeing his talented, beautiful childhood friend and fiancee Jiang Qing’e, who has been leading House Loulan in his parents’ stead! Li Luo would much rather keep a low profile and wants to call off the engagement – but Jiang Qing’e has flatly refused. What’s a ‘useless young master’ to do?

Fang Mo’er found out that she transmigrated into a novel that gave her nothing but anger when she read it. Moreover, she became the female supporting character with a miserable ending! The female supporting character that she became gave up her family fortune and career to compete for the male lead’s affection. Even so, the male lead still cheated on her with the female lead on their wedding night! According to the original plot development, Fang Mo’er would swallow her anger and still choose to marry the male lead. Eventually, the scum of the earth would cheat her of all of her resources for the female lead. Simultaneously, she would also do something crazy out of jealousy and eventually destroy her own reputation. Fang Mo’er decided that she would never walk down this path again! —In front of the Department of Civil Affairs, Fang Mo’er, who just transmigrated over, hung up on the scum’s call that meant to tell her to postpone their wedding. Coincidentally, a handsome man clad in a suit walked to her side. The man said, “Miss, since your groom isn’t here and my bride ran away, why don’t we get married instead?” Fang Mo’er did not pay too much attention to him and wondered who he was instead. She did not recall having such a stale plotline in this novel. The man continued, “Oh, I forgot to introduce myself. I’m Shi Mo.” Fang Mo’er’s eyes nearly fell out of her sockets. Shi Mo? The man who only appeared once in the entire novel; the CEO of the world’s biggest entertainment company? What else could be more vengeful than marrying Shi Mo to disgust the scum of a couple? “Deal!” The current Fang Mo’er was still immersed in the anger and vengefulness from the novel. Hence, this was just her trying to change the fate of a character. However, she forgot that she had become Fang Mo’er, and at this moment, she had just chosen the man who would accompany her for the rest of her life.

Thrown into a brutal world of swords and sorcery, his memories stolen by an unseen force, Magnus wanted only one thing: to go home.But every kingdom, devil, and god — along with regressors, possessors, and fellow reincarnators — seeks to carve him apart.Survival demands war. War demands survival.And with a System that hides more than it reveals, Magnus is dragged down a bloodstained path... one battle, one betrayal, one broken world at a time.

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.