One Piece: I am Imu - Chapter 11: Do you remember the Rocks Pirates?

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.

Jannah is a Countess in the Starlian Kingdom. She's known for her achievements in the battlefield, mercilessly ending her enemies and protecting her people.All for the peace and glory of the kingdom.“Run! They're swarming all over the place!”“Just leave! I already got bitten...!”“I can't leave without you!”However, all the blood sheds in the battlefield became useless when an outbreak befell the kingdom.Doom and betrayal hang in the air, following her like the plague.The apocalypse forced her to shed blood once again, under the guise of protecting her loved ones.Although, something happened that wasn't supposed to happen on her second run in life.[Initializing.....][System activated!][System scanning player's status...][Please enter your name:_____]“What is this thing in front of me? This thing didn't appear in my first life!”With chaos going around her, Jannah started her journey with a newfound thing called “system” to protect her people from the zombies.If you're not a fan of the list below then please click away.— Turtle progression.— Gore.— Same-sex relationships.— Questionable life choices (by MC).

300 years after becoming a Demon King, the war angel Ansel faced a serious problem during a certain expedition.

——His halo grew out once again.

Ansel picked an auspicious place that was definitely and absolutely unmanned, and while cursing, he simply and skillfully broke off the newly emerged angelic aperture.

This thing was growing out faster and faster!

When will his undercover mission end already?!

The demon realm was divided and ruled by three kings. Demon King Saros was forced to go on an expedition with his sworn enemy, Ansel.

One day, he noticed Ansel sneaking away from everyone.

Saros decisively followed him, and was shocked to find that his sworn enemy, another demon king of the demon realm, took off a horn headband and fake bat wings. As Ansel cursed up and down, Saros watched as he skillfully removed a cute halo from his head.

This irritable, easily angered guy who loves fighting; the type that was cute when he shuts up but could make even demons angered to the point of ascending to heaven the moment he opens his mouth…

..was actually an angel???

- Description from Novelupdates

[Urban Martial Arts, Passionate Martial World.] He was a super expert who, due to accepting an inheritance, underwent a physical transformation that put his life at risk. To extend his life, the king returned...