Looking for Isekai manga and LN where MC uses modern knowledge or tech to change the Isekai world

Nice, I'll check some of the LN you mentioned :)

I'll try not to stretch too far what you are looking for, these are my recommendations:

That Time I Got Reincarnated As A Slime [LN, manga]: The main character eventually gets to build a kingdom where he applies his knowledge about modern society (propper building techniques, commerce, clothing, developing several crafts are some examples). His being a former Japanese salaryman manager* (plus his Sage skill, and all the videogames, novels and books he went through) allows him to deal with other characters mainly with common sense, he's always receiving praise for it. Very good LN, great manga adaptation, good anime.

Re:Monster [LN, manga]: More or less in the same fashion as Slime, but the main character starts as a goblin and used to be some kind of high-level soldier from a space opera world, so in addition, he has tactical knowledge that gives him a huge advantage in warfare, combat, and leadership. Good novel, good manga adaptation.

Overlord [LN]: This one has a very interesting and complex plot, the mc is kind of overpowered in the knowledge area since he was a guild master in an mmorpg and a salaryman manager. Awesome novel, I would ignore the manga and watch the anime.

In those three, the appearance of the mc and his advances start to change the political scale of the world.

Arifureta [LN, manga]: Thanks to his knowledge of modern world guns and a special skill, he's able to survive in a dungeon, which in the long run is beneficial to several races in the story. Good novel, even better in the manga adaptation.

*Manager as in an upper-level employee with more experience and capability than other salarymen, who is also referred to as 'senpai' by other coworkers. This pretty much applies to all the mc's in these titles.
 
Ascendance of a Bookworm may apply (I've only seen the anime but in it, she definitely brings more modern ideas and cooking to the other world).
 
His royal highness is hungry is an isekai which brings food from modern day to historical times.
The duchess' 50 tea recipes is a reincarnation manga of how she brings tea into her world to make a difference
Cinderella chef is another one about food
 
Isekai ryouridou is another food based isekai where he changes the world around him.
Sengoku komachi kuroutan is one of my favorites at the moment, where she travels back in time and makes small changes to farming and everyday common life that have big political consequences.
 
You can try this manga called High school prodigies have it easy even in another world its about seven high school students who gets transported to another through and airplane crash when they regain the consciousness they in a world of magic and half-animal humans they build modern technology in their new
 
( https://www.anime-planet.com/manga/accomplishments-of-the-dukes-daughter ) uses our modern tech to improve her land.
( https://www.anime-planet.com/manga/crimson-karma ) uses her skills of being a solider in past life to survive and help win a war.
( https://www.anime-planet.com/manga/chichi-wa-eiyuu-haha-wa-seirei-musume-no-watashi-wa-tenseisha ) uses her knowledge of science to help people.
( https://www.anime-planet.com/manga/empress-cesia-wears-knickerbockers ) uses her knowledge of fashion to help the fashion of the past/other world.
( https://www.anime-planet.com/manga/isekai-de-caf-wo-kaiten-shimashita ) uses her knowledge of food to improve the cuisine in other world.
( https://www.anime-planet.com/manga/sengoku-komachi-kuroutan-noukou-giga ) uses her knowledge to help improve old japan
( https://www.anime-planet.com/manga/that-time-i-got-reincarnated-as-a-slime ) uses his knowledge to help make his country.
( https://www.anime-planet.com/manga/the-duchess-50-tea-recipes ) uses her knowledge of tea to help improve its reputation in the past.
( https://www.anime-planet.com/manga/young-lady-is-a-royal-chef ) uses her past life cuisine to help improve the cuisine of the other world.

There's probably more but they are the ones I found that I'm currently reading
 
I would like to recommend you guys
Starting from today I'll work as a city lord.
When a gaming otaku gains the power to cross over to other worlds, he will obviously have to figure out what to do with it! But what is this?! A powerful cat-woman elder sister, a loli fox-woman, a cuddly rabbit-woman younger sister... This isn't a zoo! Welcome to a world where the strong prey on the weak. Then again, it's all so wonderful! An authentic strategy game, a huge conspiracy crisis, this other world's hegemony is now loading, all waiting for thou scum...
Its Great.
 
I really like Isekai where modern tech or knowledge is used. While cheat RPG skills are nice not using the modern knowledge or tech is a waste.
There IMHO is nothing special about using cheat skills since they are technically possible in that world, however modern tech and knowledge would not arrive at that time to that world unless that person is from our world, so maybe that makes me feel special because I'm from this special world with advanced tech. :troll:

For example:
In Another World with my Smart Phone (MC gets to use a Smartphone and connect it to magic)

Campfire Cooking in Another World with My Absurd Skill
(MC has cheat skill to buy things from a modern supermarket)

GATE: Where the JSDF Fought
(Reverse Isekai where Japanese military gets to go into a Fantasy Isekai world)


Japan Summons
(Whole of Japan is summoned into Fantasy world along with their tech and knowledge ofcourse)

The Master of Ragnarok & Blesser of Einherjar
(MC uses smartphone and the knowledge from the internet to win wars and make tech for his people)

Ascendance of a Bookworm (MC is a bookworm and tries to make paper and books etc using her knowledge from the modern world)


Different World Foundation
(MC uses knowledge from the modern world to make stuff like paper, gun powder etc)

Doctor Elise: The Royal Lady with the Lamp
(MC goes back in time into her previous like and uses her knowledge as a surgeon)

Isekai Yakkyoku
(MC uses his knowledge as a pharmacist to make medicine)

Release That Witch
(MC uses his knowledge as an engineer to take people towards the industrial revolution)

These are the ones I've read. But I need moar!


Maybe its too late but you can try reading *empress gigolo* though its a web novel. Don't know if it has a manga version though...
-mc suddenly transported to another world and appeared at the center of the road while the empress was marching with her troops. Note: he can also go back to Earth after a few days. Also he can transport things by hugging them while he sleep.

Saving 80,000 gold in another world for retirement, light novel also has manga version,
Female MC was given a skill that can go back and forth to another world. Bringing modern thing to sell. She even transported a mercenary group from earth to help in the war. Pretty much one sided battle.

Bug Player* top player from a mmorpg but died and also transported to the world that he played. Using his game and modern knowledge to build his territory into a place that can be ready for the demon king's descend.

Travel to primitive world to build infrastructure* the description is basically the novels title so mc died a sudden death, god gave him a mission to build and teach natives with modern knowledge. I know it has a yaoi tag I basically cringed the whole time I read the novel.(Not basically against gay but you know). Ill just say the ending (one less victim) blah blah blah MC accomplished his tasked, he returned to earth before he die. His partner also came with him....

Special Mention!!!!!!! WORLD DEVOURING SNAKE!
though its not what you asked but its a novel which mc reincarnated into a little snake with a system! To eat and evolve until he ate everything. Also he also ate some godzilla monsters
 
LN :The Adventure of the Boy With a Mind of a Middle-aged Man. This one is about a scientist who got isekaid he use his knowledge to make commoner life more agreeable thought hand pump , clock , cars (since patente exist he make a lot of money ) ... And later in the novel he got a ruined territory from the emperor he make it one the most modern territory in the world with military armed with guns explosive and tanks.
 
Madougushi Dahliya wa Utsumukanai: Dahliya Wilts No More
inventor recreates modern technology with magical equivalents.
https://www.anime-planet.com/manga/madougushi-dahliya-wa-utsumukanai-dahliya-wilts-no-more



Knight's and magic
fits the modern knowledge part, but its very shonen romantisized and the technology doesn't reflect reality.
https://www.anime-planet.com/manga/knights-and-magic

Ascendance of a bookworm is very good. The MC doesn't have lazy isekai powers and it relys mainly on the protagonist's knowledge and desires instead of fluffy wishes. Top tier world and story crafting.

Isekai Tensei Soudouki
decent isekai relying on strategy and external knowledge
https://www.anime-planet.com/manga/isekai-tensei-soudouki

The Savior's Book Café in Another World
An 'A' tier isekai relying on common sense knowledge winning over stupid isekai tropes. Common sense and maturity are rather op... https://www.anime-planet.com/manga/...-muri-na-node-hissori-book-cafe-hajimemashita
 
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Takarakuji De 40-Oku Atattandakedo Isekai Ni Ijuu Suru

You guys miss this manga, not Isekai but just a lucky guy just win a lottery and find a door into another world, with his money he just win from lottery, he buy modern stuff and learn knowladge from a professional people to help the other world people he trusted. It's a slow enjoying life type of manga


Please if u find more manga like this, not novel, replying this article please, I have read all and I'm so thirsts right know, and I feels like my souls is empty T_T
 
I really like Isekai where modern tech or knowledge is used. While cheat RPG skills are nice not using the modern knowledge or tech is a waste.
There IMHO is nothing special about using cheat skills since they are technically possible in that world, however modern tech and knowledge would not arrive at that time to that world unless that person is from our world, so maybe that makes me feel special because I'm from this special world with advanced tech. :troll:

For example:
In Another World with my Smart Phone (MC gets to use a Smartphone and connect it to magic)

Campfire Cooking in Another World with My Absurd Skill
(MC has cheat skill to buy things from a modern supermarket)

GATE: Where the JSDF Fought
(Reverse Isekai where Japanese military gets to go into a Fantasy Isekai world)


Japan Summons
(Whole of Japan is summoned into Fantasy world along with their tech and knowledge ofcourse)

The Master of Ragnarok & Blesser of Einherjar
(MC uses smartphone and the knowledge from the internet to win wars and make tech for his people)

Ascendance of a Bookworm (MC is a bookworm and tries to make paper and books etc using her knowledge from the modern world)


Different World Foundation
(MC uses knowledge from the modern world to make stuff like paper, gun powder etc)

Doctor Elise: The Royal Lady with the Lamp
(MC goes back in time into her previous like and uses her knowledge as a surgeon)

Isekai Yakkyoku
(MC uses his knowledge as a pharmacist to make medicine)

Release That Witch
(MC uses his knowledge as an engineer to take people towards the industrial revolution)

These are the ones I've read. But I need moar!
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TITLE:

♡Starting From Today I'll Work As A City Lord♡

ML can isekai whenever he wants.
He buy a poor city, becomes a Baron.
With his modern knowledge he makes impossible possible, builds his own kingdom, and becomes its king.

(Ps:ML surrounded by demi-human-animal cute girls, story doesn't lack harem romance)
 
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