Anime: I Want Harem - Chapter 42

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.

What to Expect: - Fast-paced Action and LitRPG Progression, System, Monster Taming, Skill Copy and Fusion, Crafting, with Dungeon and Other Worlds Exploration. - Constellations based on all sorts of both Historical and Mythological figures. - A colorful cast of side characters full of life, the original Protagonist changes and becomes a better person. - A smart MC that abuses her knowledge of the story to become REALLY OP. - A story that doesn’t go by the script, the butterfly effect the character creates affects the story and doesn’t leave it as it was supposed to be, unlike many other similar stories. - 3 ~ 7 Chapters a week, almost daily updates until I can’t. 1800 ~ 3000+ Words per chapter, usually. No part of this work may be reproduced or used in any manner without the prior written permission of the copyright owner, except for the use of brief quotations in a review. This novel is also being posted on Scribblehub and Webnovel (for free). If you see it anywhere else, please let me know. Thank you.

An ultimate warrior, the one and only Alchemy Emperor, Ling Han, died in his quest to achieve godhood. Ten thousands years later, he, with the ‘Invincible Heaven Scroll’, was reborn in the body of a young man with the same name. From then on, winds and clouds moved as he set himself against the uncountable geniuses of this new era. His path of becoming a legend has begun once more. Of all eras underneath the heavens, I am the strongest!

- Description from Novelupdates

I have experienced all the eight sufferings of this world.

I do not ask for nirvana, but for you.

Wild and hard-to-tame demon (gong) x cold, ascetic and childish immortal (shou)

- Description from Novelupdates