With tensions between the neighboring country rising signaling the presence of a war soon to begin, Soalla, the princess of a small country, worried whether her own country would be able to defend itself with its weak national power. The king was bedridden and the retainers who were her last rays of hope had nothing but the antiquated motto of battle honor in mind. Not one person had a concrete proposal to protect the country, leaving Soalla to wonder if this was where Favell would fall... However, it was then that Naoki appeared before her. A "magician," that left his name in history who possessed the power she desired to save the country.

Year 20XX, strange phenomena started to occur all around Japan. The best way to explain it would be a ''hole'' that connects different worlds to our world. Many otherworldly beings - magicians, demons, robots and other fantasy creatures started to appear on this side, with no way to return. With the time passing, Japan was able to adapt to this event and visitors from another world stopped to be anything unusual.
And so, an unlucky witch named Henrietta was pulled through the ''hole'' and ended in modern day Japan without a way to return. How will she be able to live in this different world?

I entered my favorite romantic fantasy novel! I may be a commoner, but I'm rich beyond belief. I quietly watched the romance of the main characters in the original novel, assuming I would go back to reality after reaching the novel's ending... However, even after the ending, I am still stuck in this world! As a result, I learned the behind-the-scenes stories that I didn't want to know. My favorite second male lead, Kaelus, died. Living in poverty without him, I eventually became ill and died as well. I thought I would return to reality, but I went back in time instead. This is definitely... This means I have to save my beloved, right?

Notes: The novel of this series was originally released as R15, 7 months after being completed the book/ebook was later re-released as R19. The webtoon will follow how the novel was originally released which is R15.

With my wife's breathtaking beauty, not even the newly enthroned empress can match her! With my wife's marvelous culinary skills, not even the empress's royal chefs can match her! My wife loves me and cares about me very very much, and I wouldn't trade her for even the empress! Wait, what? My wife is the empress?!

Anezaki Satoru, a Genius had his childhood friend murdered and raped, he then tracks down her 15 killers and he murders them, he then gets sentenced to death for his crimes of murder, after being executed though, he found himself in a parallel apocalyptic world...

I became the mother of 'Ainspanner,' who was presumed to be the final mastermind of this novel. I was supposed to be a bad stepmother who abused him when he was a child and eventually became the first to be killed by him when he became an adult. I was thinking of a plan to escape my tragic fate when I saw the young future villain and the naive, innocent look on his face. However…

"What an adorable child! He’s so cute I want to bite him! How could anyone abuse him?"

He was so cute that I couldn’t believe he would become a villain when he grew up. So, I decided. I will protect him. This way, he’ll save me too when he’s all grown up.

From 87 Percent Translation:

Reiji Saeki living in the north eastern countryside town lost his life in an accident during summer vacation. .....But before he knew it, a mysterious ball of light exist in front of his eyes in a world of whiteness. Being a magician from a parallel world, that ball of light is looking for someone qualified to inherit the magic they had created to prevent it from being lost. Reiji who took on that suggestion lives in the parallel world, Elgin, with a new body and powerful magical power.

An average student got summoned to another world and granted the strongest job. 
No, not Hero, not Sage either. 

It's Inspector.
With ability to inspect anything and gather information accurately, surely this is the strongest job there is!

It has already been two years since I possessed a character in this insanely difficult game. In order to go back to Earth, I have no choice but to stop the downfall of this world and reach the ending of this game. [You have collected the body of a “pathetic soldier.” Inheriting abilities.] [Inherited rewards: Stamina +1, Proficiency +1, Dehaman’s Armored Combat (D)] I will see through to the end of this game no matter what!

Grimoire Alchemist is a dating sim popular among both boys and girls in Japan. The player’s rival in love, Claudia Ellington, is jokingly called the “Villainess of a Thousand Deaths.” But this alias of hers is actually no joke; she really does die a thousand times in the game!

Alas, our poor little protagonist ends up filling Claudia’s shoes when she gets reincarnated in the world of Grimoire Alchemist. Determined to escape the dire fate she has in store for her, Diehard Grimoire Alchemist Fan #1 (now the reincarnated Claudia) does everything she can to avoid entering the love interests’ romance routes in an attempt to separate herself from the game’s storyline and save her own skin. Despite her best efforts, she fails spectacularly as her love for the characters and game compendium of a brain lead to her pulling off impressive feats one after another.

Join her as she (much to her dismay) magnificently steals the hearts of the game's charming love interests!

The older brother, imprisoned by his sister, dies just as he escapes and is reincarnated in another world!
He thought he had been freed from his demonic sister, but now she too has been reincarnated in the same world...?

WN Raw: https://ncode.syosetu.com/n7437dj/

After saving the princesses Rio is given a scholarship to the Royal Academy, a school for the rich and powerful. Being a poor orphan in a school full of nobles turns out to be an extremely detestable situation to be in.

Pro-wrestler Shibata Genzo who's maniac pet animals suddenly was summoned to a different world. Genzo was asking by the princess to get rid of the evil beasts called monsters roaming in this world. Outraged that he was asked to kill monsters, he german suplexed the princess. Unable to get back to earth, he decided to live a slow peaceful life in this world. This is a story about an eccentric Japanese man who was a former pro wrestler and manages a "Monster Pet" shop.

Loco is a novice adventurer who begins his journey to save his sister Natty, who is cursed by a monster into an eternal slumber.

At an adventurer's guild, he meets Taiga, who was given extraordinary abilities when he was reincarnated from another world! He also meets Souya and Mia, who were also reincarnated from another world and have cheat abilities, but something happens that shocks even them!

An entertaining and poignant otherworldly fantasy featuring a party of a novice adventurer, Loco, and three reincarnated characters from another world!

Osamu, a young man who died at a young age due to an incurable illness. His second life was to drift as a "spirit (demon)" in an unknown world! Osamu, who is hated by humans and unreasonably deprived of his "life," hopes that he "does not want to die anymore." At that time, he gained the power of "life-sucking" that feeds on the vitality of others. In addition, he will resist the approaching "death" by using the science that he continued to learn on the bed in the previous life and the creative magic that makes the best use of his own dexterity. I met an immortal girl who was despaired by being tossed with life like myself, "--You tried to kill me, you guys are bad." In order to live, we are leaning toward the "stealing side" ...? An anti-heroic fantasy where a ghost who wants to live and a girl who can't die conflict with the world!

Web novel: https://ncode.syosetu.com/n4532en/

I died while I was reading hate comments on my novel.

I was already in shock over my death, but some 'Grim Reaper' appeared and told me that being a bad writer was a sin. To atone and make it into heaven, I was told I needed to survive past the ending in one of my novels.

And so, I entered the novel 'The Demon King is Dead'...

"Damn it all!! Why did this have to happen to me?!"

By all misfortune, the character I possesed was the Demon Prince, a character with no combat abilities—who dies at the very start of the story!!

Past the dreams there is a special world, where monsters and demons fight for supremacy, it so happens those same monsters and demons are also the objects of cult for religions in the real world. A victory in the monster world, means the success of a religion in the real world.
Wahowaho is a new religion, aiming to the top, and while searching for their god they have summoned a clueless human boy.

Toda Yuu was visiting a fan convention with his sister, he was looking forward the event for his favourite game, a phone gacha game with deities, but once he fell asleep things started to change in the real world.

The story that revolves around a bunny in a demon country

Massive spoilers of the main story

Jinguji Jo, an officer candidate of the Self-Defense Force, who had just graduated from the University of Defense, was reincarnated into a different world due to a traffic accident. The inventory had the standard equipment of the Japan Ground Self-Defense Force! Jinguji Jo's self-defense officer battle action makes him unrivaled in the fantasy world with equipment stronger than magic!!

The NEET Yamano Masaru (23 y/o) went to Hello Work and finds an interesting job offer. [A test play of the Miniature Garden "Razgrad World." Extended period of time, preferred to be able to live on site. Monthly salary of 250,000 + commission.] Immediately goes to the interview and signs a contract. However, the place of employment is another world. Because of the contract he's taken there, to survive Masaru received a cheat, but he is told the shocking truth. "This world will be destroyed in 20 years." Can a simple NEET prevent the destruction of the world?!