The young boy Felix, who admires the Kingdom’s Knights, is suddenly on a certain day set up as the Kingdom’s crown prince, unanticipating that he would live a life immersed in s*x. There is a queen who is also a mother, there are maids, and an ex-boss female knight, but other cougars approach! The innocent boy’s reasoning is on the brink of destruction.... more>>

With over 50 books at this point, the Harem Series is by far the longest 18+ LN series out there. Most of the novels aren’t directly connected, but they all take place in the same fantasy world.

For now, let’s take a look at very first entry in the series: Harem Castle (ハーレムキャッスル). <<less

The story of a self-interested and gloomy teenager struggling to become a living Lei Feng in the new century under systematic training.

For the wine to be drunk on her wedding night to actually have been a cup of poison and for the one to poison her to be her husband, who would believe it?... more>>

But such a thing had happened! And that was just the beginning of her bad luck.

On her wedding night, she goes from a new bride to an abandoned wife, and in the blink of an eye, she became a princess married off into the wilderness of the frigid North.

Though she is still a bride, whereas previously she was envied by everyone, now she only receives pity.

To preserve the life of another beautiful woman, she is exploited and becomes a dispensable pawn.

But she is not a weak person to be at anyone’s mercy. She will control her own fate! <<less

Ten years in the last days, like drinking cold ice.
Dark plagues come, before ancient fans return to the last days, the king who sees... more>> through the heart of indifference will completely subvert the world! <<less

The strongest force in battle x the man on the supreme throne... more>>

This was an era where artificial intelligence determined the direction of human life. The most infamous enemy to the Federation, the supreme commander of the Navi Military Command, Adrian Yate, and the youngest representative councilor of the Supreme Council, Zhong Yan, were matched up by the AI as the most optimal marriage candidates to each other.

If they reject the AI’s optimal recommendation, they had to pay the fine.

Adrian: Why should I pay? I don’t have money, so scram!

Zhong Yan: I don’t have money either.

AI: If the fine is not paid within the time limit, congratulations to your unification. <<less

One day, Nomiya Crow found himself dismissed from the spy organization he had once been a part of. His extraordinary good looks had led all his female spy colleagues to fall head over heels for him, putting the organization on the brink of collapse.... more>>

Crow unwillingly bidding farewell to his life as a spy, his next career choice took him to the role of a “housekeeper” in the home of three beautiful sisters.

The three sisters, burdened by their own excessive attractiveness, had always been wary of men. However, as Crow served as their housekeeper, they gradually began to open their hearts to him. In fact, they couldn't help but fall madly in love with him.

“...Where did your wariness go, ladies?”

This is the story of the incredibly attractive trio of sisters and the former spy turned housekeeper. <<less

He said, “I’ll wait for you.”... more>>

“I’ll always wait for you.”

As the dusky evening sky rained over him, he stood tall over the remnants of the fallen city. “I told you, I will wait at the banks of the Fei River for your return.”

A thousand years he stood waiting, watching the water ebb and flow. <<less

Yoon Sung-il, a Korean young man.... more>>

The pleasant day after discharge.

“Lieutenant?”

When I opened my eyes, I was told I was a soldier again.

And not just soldier.

The horrors of the war that came before him.

For yourself and for your people.

The coming era of madness, World War II must be prevented.

To do that, first, let’s get rid of the Nazis.

I don’t need Nazis in my Germany. <<less

“Death is believed to be a very terrifying experience. But in fact, it isn’t.”... more>>

Kasia Del Roman was a powerful soldier who was nicknamed ‘The Reaper of the Battlefield.’ She had lost her human emotions long ago and lived all her life as a tool. But when all was said and done, she couldn’t even have the privilege to die a proper death.

‘You have to go back and live another life…’

A voice, booming and frightening, rang out in the silence.

“No! Never!”

She opened her eyes without experiencing the peace she had always craved for. Lo! It was yet another battlefield of an unknown world.

“Truly a miracle! She is alive!”

“Bring a stretcher!”

Thus, Kasia starts living her new life as a war machine. However, different circumstances open her eyes to new and unique emotions she had never felt in the past.

Even so, where will the karma of her past life lead her to? <<less

Our protagonist is a college student who enjoys playing as the evil-aligned faction Arachnea in her favorite real-time strategy game. One day, she finds herself in a world similar to the one in the game; additionally, her body is now that of a fourteen-year-old girl. ... more>>

While things are a bit different from how they were in the game, one element has remained the same: she is the leader of the Arachnea. The insects under her control, collectively known as the Swarm, praise her and implore her to lead them to victory. In order to survive, she raises her Swarm and forms friendly relations with the elves of the neighboring forest.

But after a s*aver traveling through the forest mu*ders one of her Swarm and the nearby kingdom’s knights burn down the elven village and massacre its people, she prepares to launch her counterattacks in the name of revenge. However, revenge is merely a pretense for attacking the countries of this world. Her command is masterful and severe, as one who has played the game in real life… <<less

"Listen up! From now on, I'm going to transform you from a helpless and disgraceful duke's daughter into a ruthless killing machine, ready to mercilessly take down our enemies!"... more>>

It all started on that summer day.

Alicia, the daughter of a duke, had her engagement suddenly broken by the second prince, leaving her in a dire situation that could lead to her family's downfall.

During these tough times, Alicia's servant, Abel, suddenly awakens with the memories of being a U.S. Marine Corps member. To change the impending future of destruction, Abel takes Alicia and executes a strategic retreat from their school. He's determined to transform Alicia, who's feeling down, into a full-fledged Marine!

"Put your hair in a bun, and add 'sir' at the beginning and end of your sentences!"

"What do you mean, sir!?"

After going through basic training, Alicia, who still looks like a noble lady, has become a Marine at heart. But now, her transformation leads her down an unexpected path.

In her journey, she encounters something she must protect and faces unforeseen challenges, all in pursuit of seizing her own future. What lies ahead for Alicia and the U.S. Marine Corps summoned to this different world?

To the otherworld, this is the United States Marine Corps. <<less

Marin found himself in the body of a young wandering knight who was driven out of the house. Forced into the 15th Century, he was armed with only a horse, a breastplate, and a lance.... more>>

He was soon caught up in the era of German mercenaries established by Maximilian I. And so he decided to become a mercenary. Relying on his half-baked internet knowledge, he will establish his own mercenary force. Waging war with French knights and Swiss armies, even Emperors and Kings must beg of him. <<less

This is a story about the study of technology in the wizarding world.... more>>

Probability, electromagnetic induction, nuclear physics, relativity... if one explored and learned the scientific way, one would be able to master everything. This was Richard's way of thinking until he traveled to a world similar to the Middle Ages as the prince of a nation.

One day... he'd been carried away by a dragon.

"This is quite an interesting aerodynamic flight, isn't it. How does it fly when it doesn't satisfy the Kutta Condition. Maybe it has to do with the number of wings and the Bernoulli Theorem? Does it have a built-in engine?"

Richard could not help but wonder as he looked at the dragon he was riding.

"Well, this is good study material. Oh, by the way, you said just now that you kidnapped me as a prince because you wanted to find a playmate for your dragon daughter? Isn't this reason a bit too... outlandish?"

"Roar!" the dragon roared angrily and flapped its large wings straight into the sky. <<less

As Shin Youngwoo had an unfortunate life and is now stuck carrying bricks on construction sites. He even had to do labor in the most popular VR game, Satisfy!... more>>

However, luck would soon enter his hopeless life. His character, ‘Grid’, would discover the Northern End Cave for a quest, and in that place, he would find ‘Pagma’s Rare Book’ and will become a legend… <<less

The Advent of the Third Dimension signaled the end of five hundred years of civilization.... more>>

Reborn a year before the Advent of the Second Dimension, Su Han made a decision.

From the day of his rebirth, he will use the whole country to gain the power to resist destiny.

And so, Judgement Day will be rewritten.

When the darkness comes, when thousands of aliens grind their claws and descend on the earth…

An Army of Steel will be waiting …

Let’s fight! Aliens! Your enemy is the Huaxia’s Alliance! <<less

There was an order of knights that were called the strongest in a certain country.... more>>

A certain person asked, “As I thought, the strongest one is the leader right?” but was unpredictably told, “No, it’s the cook.” <<less

She was a secret agent that had transmigrated from the 21st century, the “Living Queen of Hell” Zisu. She could defeat her scheming bit*h of a stepmother, pretend to be a pitiful white lotus, and play around with playboys. It was just that her personality was slightly cold and overbearing!... more>>

She was played by fate, after her engagement was called off, she was forced to marry the “War Ghost” by an imperial order?

Rumors say that the “War Ghost” was a man who was in control of the military force and had such a high status that even the emperor feared him. However, he was a cold-blooded, bloodthirsty and cruel person who was ruthless in killing others. He was almost 20 years old but not a family dared to marry their daughters to him!

Never would they have imagined that… even heroes have a weakness for the charms of a beautiful woman. When the War Ghost meets the Living Queen of Hell, he becomes wrapped around her little finger, willingly being henpecked by her!

Rumors say that the Seventh Prince adored his wife dearly, as long as the Seventh Prince Consort wishes to obtain this world, he would dominate this world without hesitation and present it to her with both hands! As long as the Seventh Prince Consort was happy, he was willing to do anything…

“Are you really willing to do anything?” Yu Zisu smiled playfully.

“Of course, Su’er, don’t play with fire.” Ye Xiuming replied in a deep hoarse voice.

“I want that man I saw… Mmm… Ye Xiuming, you bast*rd…”

“That isn’t included!” <<less

Waking up in a drunken haze, the ne’er-do-well Zhou Wen finds himself in a strange new world and unexpectedly inherits a piece of land. He had assumed he would be living a life of luxury as a nobleman with a castle, gold coins, and beautiful women at his disposal. However, reality proves to be far from his wild imagination—he is actually the poorest lord in the entire continent!... more>>

Until he finds a way back to his original world, Zhou Wen must bear the responsibilities of being a lord. Witness how he transforms this impoverished land and embarks on an exciting adventure full of surprises in this fascinating new world! <<less

Olivia is just a baby when the mysterious Z finds her at a temple in the depths of the Forest of No Return. From that... more>> day on, the temple becomes her home and Z her family. Z, a god of death, educates her in the ways of the world, in combat, and in the long-forgotten arts of magic—right up until the day Z disappears. Olivia leaves the forest for the first time in search of Z with its ebony blade in hand. Out in the wider world, all is not well. A bitter war rages between the Asvelt Empire and the Kingdom of Fernest, and Fernest is losing badly. When Olivia shows up on Fernest’s doorstep with a sack of imperial heads looking to volunteer, the royal army happily welcomes her into its ranks. Thanks to Z’s training, she quickly proves herself as a ferocious warrior. In fact, she might be just what Fernest needs to turn the tide of the war...but will they accept her lack of people skills and disregard for discipline? And will she ever see Z again? <<less

Surdo was the king of the Golden Wolf tribe, while Dyria was an enemy soldier. Their romance was supposed to be a one-time affair during the war. However, it became a major issue when Dyria became pregnant with the wolf's child—Ash, whom he had been hiding in a remote village. ... more>>

After a very arduous search six years later, Dyria and Ash were forcibly taken to live in the palace of the Golden Wolf tribe. And there he met Yudha, the younger brother of the wolf who he had love with the night of the war. <<less

Qin Zhaoyue, a hundred-year-old Soul cultivator and famous artifact refiner, dies and transmigrates into a body of 16-year-old Xi Zhaoyue, who was killed on her wedding day.... more>>

The unlucky previous owner of the body was an illegitimate daughter of an influential family and was forced to live her whole life in the orphanage. However, at the age of 16, her Guide glands were awakened and as fate willed it, Xi Zhaoyue happened to have the highest compatibility with the youngest, bravest, most handsome Major General of the Empire, a dream husband of the whole Outer Space! Finally, a loving family she so longed for was within her reach… Yet, at the wedding ceremony, her Mental sea was invaded and she died.

Once Zhaoyue figured out the situation she landed herself in, she vowed: she wouldn’t be a proud and self-respecting cultivator, if she didn’t strive for independence, for the right to live the life freely! Cultivate, refine, get stronger! Become your own person! <<less

Hacker God Mo is the Number 1 Hacker from the 21st Century. Reborn in the Interstellar era, he was an ancient man from thousands of years ago. His ambition is to shine the name of God Mo in the interstellar era.... more>>

As for his Male God, he is a famous Marshal who sits in the top platform of Gods: a noble and cold person.

To protect his little chrysanthemum, Wu Zimo decided to pretend to be an ordinary person. Let’s see how long Wu Zimo can protect his chrysanthemum… I mean, his identity as an ordinary person. <<less

Jeong Tae-ui, who considers himself ordinary, is a former soldier and the younger brother of the genius Jeong Jae-ui. His life begins to take an... more>> unexpected turn when he starts working for the United Nations Human Resources Development Organization (UNHRDO) for six months, at the not-so-subtle insistence of his biological father and uncle, Jeong Chang-in. His life becomes intertwined with that of Ilay Riegrow, a crazy guy with pretty hands. This leads him down a path he had never considered before. This story involves modern setting, battle romance, professional work, jealousy, foreigners, serious setting, incidents, a cold-blooded ML, a strong ML, an obsessive ML, a beautiful ML, a crazy ML, a black-bellied/strategic ML, a chaebol ML, a scum ML. <<less

“Princess of Argonia, are you God’s maid of honor?”... more>>

The aggressor of the continent stared at her through his piercing eyes.

It wasn’t that he had a sword, or that he was mocking her.

He just looked at the Princess of Argonia, as if he was going to unravel her. He was staring at her with those beautiful, cynical, cruel, cold-blooded, and horribly greedy blue eyes of his, that she thought she had committed an unforgivable crime.

“W-Why are you doing this to me?”

“I don’t need a reason to break flowers.”

She always just wanted to live earnestly. But neither in her hometown nor in the imperial palace, can she escape from a man who was trying to plunder her. <<less

She’s somehow ended up transmigrating into the book as the supporting female lead, who was beaten to death! Deeply in love with the male lead, she’s fated to be beaten to a bloody pulp before even holding hands with him?!... more>>

First things first, she needs to survive and latch onto the big thigh of a patron. But the supporting male lead is a true gentleman and feels nothing for her stunning, alluring body. That’s alright! She’ll latch onto the old madame or the male lead then!

But why does the supporting male lead look at her with increasingly odd eyes? And what of that Wulin Alliance Head with the personality disorder? You’re just a random bystander, what are you getting involved for??

Finally, the male lead could bear it no longer and dragged her back to the Prince Li Manor… <<less