Ao Sato is accidentally swapped with himself in a parallel world with a male/female ratio of 1:39.

He finds a kind family and lovely women at the place where he was switched.

Seeing the outside of these women, he's relieved to see that the number of men and women has changed, but not much else.

However, their inner lives are filled with conflicts and troubles.

I drew a lottery at the Shopping District and won the privilege to go to another world. After drawing a lot of balls, unexpectedly I got a cheat-like skill. Silencing those who are noisy and getting hold of all the things that I want. I will satisfy all my desires.

Japanese Light Novel (Bookwalker): https://bookwalker.jp/de3a938b85-e9d2-4f4d-9161-49b2f44782a3/

A little girl gets sent to another world where she does her best.

Web Novel: https://ncode.syosetu.com/n8991ct/
Light Novel: Bookwalker

The protagonist, Lee Hansoo, finally reached the boss stage after nine years of playing the game “Dungeon and Stone”, which no one had been able to clear until now.

However, just as he entered the boss room, he saw a notification alerting him that he had cleared the tutorial and that he had possessed the body of the barbarian, Bjorn Jandel, who was a playable character in the game!

In the world of “Dungeon and Stone”, only one city remained standing after the destruction of the world. A labyrinth would open every month, offering explorers a chance to clear it for rewards. In this world where barbarians are seen as useless in everything but battle, a barbarian who does not fight will not be able to survive. If one cannot pay the outrageous taxes demanded by the city, the only fate that awaits is a downgrade in status to a ‘lower-class citizen’. If it is revealed that you are possessing the character you are playing, you will be named an “evil spirit” and killed. The only way for Lee Hansoo to survive is to enter the labyrinth and fight while risking his life.

With the skills he has accumulated over nine years of gameplay and a stupidly strong barbarian physique, he strives to survive in this game!

One day, my wife disappeared. My young daughter suffers from a rare disease with no cure, and life offers no chance to breathe. Just when I was about to give up on everything— I suddenly found myself transported to another world with my daughter. And not just any world… but the dark, terrifying fantasy novel my wife wrote! I have to save my daughter, no matter what.

After the events of Baki-Dou, the famous Kenpo master Retsu Kaioh wakes up in a new world unknown to him.

Note: This is the official entry, not to be confused with the Doujinshi from Twitter user @sakuramankiti. As of now there is no official cover so the December 2020 issue of Monthly Shonen Champion is being used instead.

Aizawa Yuri has reincarnated 2 times now and is dead tired of being the emperor of this and that. Using his skills he acquired a reincarnation artifact, and starts his life in a brand-new world!

He was suddenly summoned to another world one day.
Monsters poured out, a huge disaster incoming.
His ability the lowest.

[Player's level is low]
[Your level is hopeless]

It doesn't matter whether you're the chosen warrior, a talented wizard,
or someone who travelled back in time.
One must do everything they can,

in order to survive.

The Regressor's Instruction Manual.

"It doesn't matter if I'm trash." Is there anyone who wouldn't do anything they could to survive?

"Haruka Yamagishi" is a guy who has no friends or family and just goes back and forth between work and home. One day, when he wakes up, he finds himself in a different world. And for some reason, he's turned into a beautiful dark elf! Now, Haruka has inexhaustible magic power, a sturdy body, and a new life where she can do anything... However, through the friends she met and her activities as an adventurer, changes slowly began to take place. The guy who gave up on life in this world begins to feel what it's like to live. Although there are some traps and other events, it's a touching adventure story!

[Source: Manga updates]

Suzuki Iruma has just been sold to a demon by his irresponsible parents! Surprisingly, the next thing he knows he's living with the demon and has been transferred into a school in the demon world. Thus begins the cowardly Iruma-kun's extraordinary school life among the otherworldly...

A young girl fights on the frontlines in war. She has blonde hair, blue eyes, and nearly transparent white skin as she flies through the air and mercilessly strikes down her enemies. Her name is Tanya Degurechov and speaks with a young girl's lisp while she commands the army. Tanya used to be one of Japan's elite office workers, but because of a wrathful god was reborn as a little girl. Prioritizing optimization and career advancement above all, she will become the most dangerous entity among the Imperial Army's sorcerers.

"If I slash, it will be cut."

I, who was once called the best swordsman in the nation, have ended up in a mobile game I've only spent money on a few times. And I’ve even received the blessing of the 'Sword God'!

But… the only weapon I can use is a sashimi knife?

Just one minute a day. I become a Sword Saint with a sashimi knife.

Duke Ferio Voleotti suddenly decided to adopt a daughter and finds a girl who he takes a liking to. This story is about a “loving” family of the world’s most richest, strongest, and arrogant father, his cute, blunt, muscle-loving adopted daughter, and a stepmother with a strange secret.

In the mobile gacha game infamous for its atrocious difficulty, the Master ranked 5th in the world, 'Loki', loses consciousness while raiding the Dungeon.

'What? I'm a game character now?'

After waking up, 'Loki' realizes he has turned into a Level 1, 1-Star Hero—'Han Yslat'. To return to Earth, he must lead the newbie Master and heroes and clear the 100th floor of the Dungeon!

'You messed with the wrong guy.'

This is the story of hard carrying by Master Loki who never accepts even a single defeat.

When the boy's soul enters the body of a girl, but what about he's able to destroy the demons in order to protect the world? A work of Jiu Ye has officially launched.

My name's Karina—or at least, it is now! I used to be a nondescript, run-of-the-mill Japanese salaryman until I was whisked away to a divine realm where the Goddess of Time and Space told me I'd be living a new life in a new world—and as a girl, since apparently she prefers it that way. First she wants me to beat some final boss she has a grudge against, then she takes control of my body to show me how to use my new spatial magic powers in a tutorial fight... Wait, isn't that the final boss I'm supposed to beat?! Less than in a minute into the tutorial and he's dead!? And now she says the world's my oyster. Seriously!?

Official English Light Novel: https://j-novel.club/series/knock-yourself-out-the-goddess-beat-the-final-boss-in-the-tutorial-so-now-i-m-free-to-do-whatever

Just like how everyone adored heroes in their childhood, a certain young man adored those powers hidden in shadows. After hiding his strength and living the mediocre life of a mob character by day while undergoing frenzied training by night, he finally reincarnates into a different world and gains ultimate power. The young man who is only playing at being a power in the shadows, his misunderstanding subordinates, and a giant organization in the shadows that gets trampled….. This is the story of a young boy who had adored powers in shadows possibly eventually reigning over the world of shadows in another world.

Seonghyeon Han is a victim of a violent crime that left him with impaired legs and a fear of the outside world. Now, he faces an even greater challenge: while he gained the power to create clones, he has just 24 hours before being sent to another dimension.

As the countdown ticks down, Seonghyeon makes a desperate move -- he sends his clone through the interdimensional portal, and discovers his real body can remain safe at home.

Thus begins the epic tale of Seonghyeon's... clones.

(From NovelUpdates)

When I woke up, I found myself inside a spaceship.

I guess you guys think I’m talking nonsense here, but I also have absolutely no clue about what exactly happened to me.

I was really close to completely losing it, but fortunately, I managed to notice that this place was really similar to the world featured in a game I was playing recently.

Am I dreaming? Nope, it’s no dream. Maybe I actually got sent to a different world or something?

But didn’t those things usually involve getting sent to a magical world with elves, dwarves, dragons and whatnot?

In any case, I don’t know what caused this, but I guess I’ll just have to suck it up and live properly in this world from now on.

It’ll be okay. I got my trusty spaceship so I can probably make some money. It’ll work out! It has to!

This is the story of a man abruptly thrown into space along with his private spaceship. He runs around with it and saves damsels in distress along the way, flirts with said damsels, earns money as a merc-for-hire and uses his gaming knowledge to work his way into living freely and easily.

Controlling the Queendom of Sevek’s female prison with the Power of the Kraken!

From the author of Akame ga Kill and Mato Seihei no Slave!