The story will combine the legend of a demon king with a hero who crosses over time and other things. The comedy will involve traveling between a Japanese living room and another world.

William is the lone human in a city of the dead. Born with vague memories of a past life in contemporary Japan where he failed to do anything useful, he is determined not to make the same mistake again, and that this time, his life will be lived. But what does that really mean? Raised by a group of the undead, William must discover what circumstances brought him to this city and these people as well as what it means to not just exist, but to live a full life.

I reincarnated into the world of an otome game as the villainess, “Ophelia.” I thought I'd be able to enjoy a peaceful school life, but to my dismay, I found myself subjected to constant harassment at the hands of the wicked, vindictive heroine; and to top it all off, I’m plunging headlong into the dreaded Bad Ending — hold up, as if I’d meekly submit to such a fate! If that’s how it’s going to be, I’ll tap into the top secret "cheats" known only to those who've played the game and carve out the 'Villainess Route' of my fantasies!! But for some unfathomable reason, the capture targets seem to be doting on me far more aggressively than in the original story…?
Original Web Novel: https://ncode.syosetu.com/n0411fu/

Dragged by the quarrel between brother of a count of a certain remote region. Kazami Shingo (風見心悟) was summoned into another world. The purpose for that summoning was “to make the territory prosperous”. To sum it up, it the typical summoned into another world thingy —- so was what Kazami thought at the time.「But, I’m only a mere veterinarian.」However, never underestimate a fantasy world. This world has dragons, monsters, and many other races. The difference of language, magic, food, religion, common sense, and many other aspects from Earth were also endless. Even so, the veterinarian become a public servant and for the time being performing autopsies, medicine making, and improving agriculture.Not as a hero, not as a doctor, but as a veterinarian, and this is the story of how he do his best in making this another world as his new house.

Hidako Masamune is a high school student who suffers from continuous bullying by his classmates. Becoming tired of it all, he decides to commit suicide, but instead he is transported to another world along with all his classmates. When they arrive, they find that they now possess amazing abilities, but he was only granted the status of a "healer," the weakest skill of all. The king decides to get rid of him by transporting him to another far away place, but not before Hidako swears revenge against the king, the kingdom, and all of his classmates.

A story about a man who wants to make a zoo full of mythological creatures in isekai.

"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]

The protagonist is a player of a VRMMOFPS game who ends up falling off the map while playing in PvE mode, and ends up being transported to a fantasy world with his FPS system.

If you accidentally crossed over into another world, what kinds of abilities would you need to reach your peak in life? Would you became an Enchanter? A Hero? Or maybe a Cultivator of Immortal Techniques? Of course not. You would take advantage of your present day knowledge in this other world to do business and earn big bucks!

A widely popular TV animation series "Magical Girl ☆ Charming Luluna". Niimi Reiji, is a huge fan mahou shoujo otaku.
One day he died while saving his friend's daughter suddenly reincarnated in a different world. But, as a magical wand rather than a human being!
He has ability to Make(forced) a beautiful girl that you met into a "Magical Girl" and turn it into a magical (physics) power in a different world!
Beginning in a different world adventure of Magical Girl Saga to fight demon king forces, start!

Sei, a 20 year old office worker was summoned to a different world after finishing some overtime work. But the person who had summoned her looked at her face and said, “This is not the Saint.” Is this neglect play!?

Sei left the royal palace and concealed her saint title. She started working at a laboratory where she made potions and cosmetics. She used her magic to grant people’s requests and slowly people began suspecting that she was a saint…

Can Sei enjoy her slow dreamy different world life without her saint title being found out?!

I'm done with romance, so send me home!

Kim Yi-Young was just an ordinary civil service exam candidate in South Korea.
After studying for more than four and a half years, she finally passed, a truly ordinary person with nothing but reading novels here and there as a hobby.

However, on the day she went out for a celebratory meal after passing the exam, she got into a traffic accident and died, only to find herself reincarnated into the fantasy hunter novel she was reading.

To her, the "System" offered a way back home.
Determined solely to return home and cuddle her warm cat and adorable Maltese, Cerberus, she gained strength through dozens of regressions.
Signing contracts with the constellations of the original work and dying multiple times, she eventually succeeded in conquering the "Tower" of the original work and defeating the owner of the tower on the final floor.

Now, all that's left is to go home......

Or so she thought!

[Due to an error, instead of returning to the original world, we will reincarnate you into the author's new work!]

I don't need that! All I wanted was my sweet home!
Is that so difficult?! I even got rid of the Tower!?!?!

Moreover, romance fantasy?! Even in my previous life, I didn't care about romance, not one bit!
And to top it off, I didn't even reincarnate into my own body this time, but into the "villainess" of the book!

I'm not afraid of the threats in this world, but I'm worried about being forced into a romance quest.

Can I go home......?

It has been seven years since Sora Ono was sent to another world, where she was enslaved. Because of a clerical error, her “slave” status was revoked, and Sora walked away a free woman. Then one day, she purchases a slave...

Ryouma Takuma, a 39-year-old man with a hidden past, finds himself in a strange white room. The gods tell him that he has died and they are sending his soul to a different world, a world where magic exists. Living alone for 3 years, his gamer soul loses common sense and starts heading toward crazy routes.

I suddenly remembered. This world is the world of an erotic manga, and that I was reincarnated as the scumbag who is supposed to steal the heroine in this world. Well, I don't have such a hobby, so I thought the heroine should get along with the protagonist. But why are you paying attention to me, heroine?

By the will of the goddess, Itsuki Shinomiya was given the privilege of choosing various abilities and being reborn in another world.
However, before going to the other world, he didn't want to involve himself in scary, dirty, gross things like battles.
Fiercely determined to live a slow life, he chose the unique skill [Pocket Money], giving him an amount of money once per day.
"With this, I can hang out with girls without having to work!"
Dreaming of avoiding battles and living with cute girls, Itsuki stepped into the other world!
But the reality was not that simple.
Getting attacked by giant bugs, getting caught up in arguments at the guild, and getting stuck with slaves?!
In the end, will Itsuki be able to live his ideal slow life?!
Using unique skills and manufacturing skills, an exciting other-world slow life with beautiful girls starts now!

“I'm not just a foil!”

In order to stop more people from reincarnating into his world, the former elite knight leader sets out on a mission!

An unprecedented comedy about preventing any and all reincarnation is about to begin!

Sansui died and was taken to god, where he explains that due to his mistake he killed Sansui, and as an apologize god said that he would reincarnate him in another world with the power he desires. Sansui desire to be the strongest in the world, but soon realizes that his desire may be the most difficult test of his life.

Following a disastrous encounter with a noble, Myne finally resolves to say goodbye to her family and friends in the lower city, changing her name to “Rozemyne” and beginning her new life as the adopted daughter of Ehrenfest’s archduke. However, her days as an archnoble in noble society are brutal, as she is put through rigorous etiquette and magic training on top of her duties as High Bishop and forewoman. It all proves too much for a weak little seven-year-old girl… Or it would have, had the High Priest not offered her the keys to the temple’s book room as a reward. If she could get her hands on those, she’d be able to read all sorts of precious books! Her name may have changed, but Rozemyne’s passion for books remains the same as she charges into a whole new world! The detailed setting expands as the printing industry grows in size. Here begins Part 3 of this biblio-fantasy for book lovers everywhere!

Ten years after being transported to another world.

It was more than enough time to awaken from what at first, felt like an exciting fantasy dream world. And on this 10th year Wasa Tooru gives up searching for a way to return to Japan, after being unsuccessful for so long.

It was then that a job offer found its way to him— it was to be the bodyguard of twins who have knowledge of Earth.