He is a successful writer who has created a fantasy world in his novel. But he made a terrible mistake in the end, causing the protagonist to reveal himself as a traitor and the world to be dominated by the demon king. He received the wrath of readers and regretted his choice.

Then he woke up in his own novel, in the body of the villain Shin Kang Ho, a ruthless killer who works for the demon king. He is five years before the disastrous ending, and has the chance to change the fate of the world. But Kang Ho has no intention of being a hero. He knows the world is cruel and full of greed. So he decide to use his talent and knowledge to achieve everything you can, without caring about others.

Kang Ho will devour all the resources, rewards, skills and treasures he finds on his way. He will become the strongest and richest of all.

Allen, an eight-year-old boy from a poor family in the royal capital, is living a poor but happy life together with his mother. One day, however, memories of his previous life suddenly come back to him and he remembers that he is in an dating sim game and that the capital will be destroyed by war if he doesn’t do something about it.

If this continues, both he and his mother will be killed!

With a sense of urgency, he decides to rise to the occasion in order to save his precious mother’s life and save his favorite character, the villainous young lady Anastasia, the only girl he liked in the game, from her all too tragic and ruinous end.

This is the story of a man who isn’t even a character in the game, but who strives with his steely determination and uses all the knowledge he has to turn overcome fate!

Original Jp Web Novel: https://ncode.syosetu.com/n6755gk/

Two childhood friends born in a remote village.

One of the boys, Alfi, was good at everything, and grew up as a genius (+ handsome) with four attributes of magic, and entered the elite magic school as a scholarship student.

On the other hand, the other boy, Reese, was a seemingly mediocre and naughty boy who could only use defensive magic for beginners, but in fact he was discovered by a rare Sage and had been educated as a gifted child since he was a child!

And Reese enrolls in the elite magic school with one extremely defensive magic, brilliantly destroying the common sense of childhood friends, teachers and students!
An uncaring and selfish commoner pushes the aristocrats away and runs up the school caste at explosive speed!

In a dilapidated castle, Astaroth awoke as a Demon King.
With his ‘wisdom from his past life,’ he would rule over his lands as a thorough ‘realist.’

“Demon King, why are you attacking the level 1 Heroes?”
“Defeat them before they become stronger. That is called strategy.”

“Demon King, why are you sending fake money to the enemy country?”
“To bring chaos to their economy, so they will self-destruct.”

“The werewolf troops have attacked. Should we use silver bullets?”
“Not bullets, shoot them with canons.”

And like that, Astaroth ‘reformed’ the old tendencies.
He became a lord who was loved by the people and his subordinates, and he would go on to be called the most powerful Demon King in history.

Some 20 years have passed since the protagonist was summoned to another world and retired from the army. He is still single in his 40s and lives as a low-ranking professor, until one day, an elite 'monster girl' transfers into his class.

If you're reincarnated in another world, you will be naked and alone in the forest. The only things you can rely on without magic or cheats is your wits and fists!

Author's Twitter: @yazin_uhouho: https://twitter.com/yazin_uhouho
Web Novel Raw: https://ncode.syosetu.com/n5771ei/
Alternate Raw: NicoNico: http://seiga.nicovideo.jp/comic/41841

I was reincarnated into the body Cecilia Silvie, the villainess of an otome game.
According to the plot, what awaits me in the normal route is either a slow, painful death or an instantaneous one... Essentially, every route leads to my demise.
Then I'll change my fate! And that's why I decided to become a man.
However, I made a mistake during a certain event, and the story began to head down an unexpected path...?

One day 's lunch break, suddenly a male high school student Yuzo Ogata being transferred to another world of sword and magic together with four other friends.

According to the Princess of Space-Time Magician, a foreign world who summoned them, they want them to beat the Demon Lord as Heroes to save this world.
Suddenly I was surprised at four friends "Temple", but it was a relaxing expression ... ... where the princess told of a startling fact!
"`―― There should only be four braves though?"
"A man who was mistakenly summoned to a different world" What will be in store as to his fate?

Source: http://konomanga.jp/manga/taitei-cheat

Dirty oldman isekai

Fantasy harem-comedy begins with a kind-hearted uncle who helps the weak, crushes the strong while doing some consensual seeding here and there.

***Contains spoilers for the ending of Part 1***
After the discussions with the temple master and head priest ended, Myne won the right to be treated as a noble with the role of a blue-robed shrine maiden apprentice.
Work in the temple began and Myne could read books in the long-awaited temple library.
However, there were many problems in the temple, such as adapting to the class system and dealing with the problem children assigned to her as attendants.
Overcome adversity to be able to read books in peace!
A biblio-fantasy written for book lovers and bookworms! The second part begins!

Alexander Purchinov is president for life of the country of Pursia, a country ruled by violence and the influence of its government. Alexander always desires to be dominant, and "ride" things, whether literally or figuratively. Now that he has already ridden his country, his next target is a fantasy world that has orcs, wyverns, and centaurs.

One day, Sanada Shirou, who works for a black company, is transported to another world. Using his "creation magic", an ability he gained when transported, he opens an inn and is supposed to lead a slow life, but this other world is a little strange?! It is a world where women are overwhelmingly dominant, where women do dangerous work and battle, and men are powerless and are protected! The daily life of entertaining (in many ways) the women of this other world begins...!

Web novel: https://kakuyomu.jp/works/1177354055503576578

Yuuri, a 30-year-old housewife who was unilaterally abandoned in marriage, suddenly gets lost in a different world. She, who was introduced to the work of potion harvesting by an S-class adventurer and gradually got used to life in a different world, realized the ridiculous secret of the harvested potion. The potion without the recovery function that she thought was off was actually soy sauce. In addition, dishes made with it have a bonus of correction function! Will Yuuri's dishes change the common sense of the other world?

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.

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.

“You good-for-nothing bastard. You are the son of a Sword Saint, yet you dare pull such a defective Class!?”

During the〈Divine Blessing Ceremony〉of the 15-year-old Elma who came from a lineage of Sword Saints, he had manifested a commonly deemed defective class known as the Heavy Knight. He had been deprived of his position as the next head of the Edvan Household and was then exiled. The Heavy Knight class had an unbalanced status and useless skills, to top it off, it was even said to be a class cowardly and indolent people have.
But, Elma knew better—that this world was the world of the game he had used to play before—and that the Heavy Knight class was the strongest class to exist. Elma made full use of the knowledge he had in his previous life and began his efficient walkthrough of the world he was reincarnated into.

Sozai Shuu, a working adult with a slightly weird habit of loving to collect raw materials, was transferred to another world by God after losing his life.

In order to live leisurely, Shuu wished for 『a power to live a carefree life collecting raw materials in another world.』His wish was successfully granted however, his magic power is strangely enormous, and his skill is really convenient? Seems like God misunderstood that he wanted to harvest materials from monsters leisurely so the power he gave Shuu was so incredible….

Nevertheless, Shuu does not take it to mind and freely uses his unique skill 【Detect】 in another world to search for materials, harvest them, eat them, make money off of them and lives a carefree life collecting materials.

From a caste based high school, bottom-tier Shinji Naomi is caught up in a summon of his class to a different world. However, as soon as they arrived the king said, "This guy is unnecessary because he only has clumsy skills " and it is concluded that he is to be forced to administer the orphanage, which no one wants to do. Unfortunately for the orphanage his skills were cheat skills that cause the girls to cling to him.

In order to "defend" the girls that depend on him, he must operate the orphanage while overcoming the powerful people, authorities, and former classmates that surround him.

Stories following various adolescent girls and their encounters with puberty and other worlds.

An old school yakuza, Nagamasa Ryumatsu, ended up losing his life due to certain circumstances. But, when he awakened to a strange sort of scenery he had never seen before, he found that he had somehow changed into a beautiful girl!?