Level up Zombie - Chapter 249 At The Start

Aomori, who has a monster-fighting system, came to the world of One-Punch Man and gained the ability to enter various instances.

Therefore, “Founder of the Hero Association”, “NO. “And other titles fell on him one after another.

Comprehensive flow, the main world One Punch Man.

Completed dungeons so far: Pokémon – Demon Slayer – Sword – Pokémon – Digimon – Spell Return – Yokai Comprehensive World (Girls that Noragami Inuyasha can see, etc.) – Pokémon – One Piece-re0-Dragon Ball wait.

- 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.

Some are reincarnated as the shining, pure character known as the hero of the story.Others find themselves as secondary, unknown characters, carrying no weight in the flow of events.And then there are those who are reborn as villains… villains meant to be struck down, forming the very foundation of the hero’s growth.As for me?I was neither a hero,nor an ordinary villain.I was merely a cursed soul,reborn as an experiment within an organization that worships an unknown entity.Am I just a third-rate villain?… I wished it were so.Because the truth is far worse.I am the character who appeared in the very first scene of the game,even before the hero made his entrance.I am…the Vessel.Discord: https://discord.gg/78GdZmDu

“Push her! You can’t let her get back up!”

“That’s right! You have to straighten out that heinous b*tch!”

A goddess of war whose fearsome reputation enveloped East Asia was betrayed and killed. Then, she was reborn as Caroline Lambert, a vulnerable lady with a tarnished reputation in New York City! Despite being the daughter of an important family, her family heavily favored her stepsister, so the bullying and physical abuse were frequent. Her fiancé, who used to woo her fervently, stood before the public with her stepsister in his arms as he declared their engagement annulled, making her a joke amongst the rich and important.

Her stepsister was also cunning enough to steal her position and take away all the affection that should have been hers, and smeared her name to the point that she was condemned by everyone! And yet, when the goddess of war reincarnated as Caroline, everything became different!

Withstanding the malicious slander, she carved out a new, bloody path. Insults from her family? Attempting to steal her late mother’s estate?

Caroline issued papers announcing that they had cut all ties, and that her mother’s estate would be donated to charity! See here, she would rather donate every coin to charity than keep them for you!

They were saying that she was a piece of trash who had nothing going for her? Sorry, but she was a prodigious doctor, a mercenary, a racer, and a top hacker…

Though Caroline wanted revenge for the body’s original owner, she inadvertently picked up a sickly, beautiful man. Seeing that he did not have long to live, Caroline agreed to his proposal… Only to find that like her, he was a man with multiple identities that could leave New York shaking once revealed!

Caroline: Aren’t you supposed to die an early death? Liar!

Edwin: It’s not a lie. My wife clearly pities me!