The spring fountain town of miracle that heals anything, Polka. In the hometown of memories, with my dear parents, there was a figure of a half-elf girl who swore to become my female s*ave.... more>>

Repeating such a memorable talk every time he drinks alcohol, 25 years old Andy Smeyson is a former blacksmith’s apprentice and an innocent crossbow soldier. Andy is surrounded by nice companions and competent and sexy bosses, which is different from what he had thought when he was a child, but this was a cozy life. When the half-elf girl suddenly appeared in front of him, he will jump into a furious destiny. Andy, who is weak but courageous​ and clever will meet a lot of different race ladies such as elves, half elves, dark elves, loli dwarves, dragon girls, beast girls and make them his female s*aves one after another. The h**ny adventure started from a half elf girl who doesn’t stop liking him will eventually become a legend ──. <<less

Gio, the demon lord who reigns over the Arobagne Continent, is suddenly summoned to another world in the midst of battle with a hero.... more>>

The beautiful women who welcomed Gio in this unfamiliar world are: Queen Alisa Est, the queen of the Est Kingdom and Duchess Sheila Eunera, the younger sister of the late Est king.

The two of them performed a ritual passed down in the royal family for generations to summon Gio as a hero, entrusting the survival of their country to him in a time of crisis.

Believing in Gio as a hero and relying on his power, they tell him about the ruler of the Kirsch Empire, who is invading the Est Empire and claims to be a mage and the Demon Lord Kirsch.

Intrigued by Kirsch's power, Gio decides to become a hero.

And as compensation for his services, Gio requests the bodies of Alisa and Sheila!

With his overwhelming magic power, he defeats countless enemies, making the bodies of beautiful women as his reward.

The story of lascivious Demon Lord as Hero begins! <<less

When the heroes announced the start of their journey to defeat the Demon Lord, it caused a great commotion. Amidst all this, a merchant tries to take advantage of the opportunity to make a profit.... more>>

On the way to Andersen, a town where people, goods, and money gather, a female warrior arrives to save the merchant from a gang of thugs.

Seeing this as a business opportunity, the merchant immediately begins negotiations with the warrior. He tries to sell her an expensive blue dragon sword.

However, the female warrior has no money, and so she proposes to fight a duel with her own body on the line for the blue dragon sword.

No way. There is no way that a weak merchant can win against a strong female warrior!

However, the female warrior’s body is voluptuous and sensational.

The warrior asks again,

“Will you accept the duel?”

Then the words spill as if it came from the merchant’s loins.

“Alright. I’ll do it. Let’s duel!”

And so begins the merchant’s journey, full of feminine woes, all to secure huge commissions! This is a full-length adventure fantasy story centered on a traveling merchant, with female warriors, priestesses, sometimes female students, Heroes and even Demon Lords joining the action! <<less

Saria, a knight, made a firm decision to make a name for herself by hunting demons that harm people. However, she botched the job and ended up being saved by Anya, who is a demon. In order to repay the favor, Saria starts living with Anya. As she gets to know Anya and their bodies come together, Saria’s heart races uncontrollably…... more>>

Even though she came to defeat demons, Saria ended up being saved by the demon Anya. As a knight, to properly show her gratitude, she offers the power Anya desires, surrendering her body as Anya commands, sharing kisses and cunnilingus. When Saria tells Anya to target her and not other humans, their play becomes even more intense! Furthermore, as they continue living together, they discover each others secrets… Enjoy the deepening yuri love that transcends their predetermined roles. <<less

Mikoto and Takeru both belong to the [Black Cat Demon Extermination Brigade].... more>>

One day, they are sent to the prestigious Seisen Girls’ Academy in order to exterminate the youma that have been sighted on the school’s grounds. They infiltrate the school as one of its students, but as they continue to fight demons night after night, they discover dark secrets lurking around the place.

Just then Takeru is afflicted by a curse and the two are attacked. To save her sister from the clutches of lust, Mikoto ventures forth right into the enemy’s den, only to witness the female students of the academy giving themselves away to pleasures of flesh.

Limbs entangled, the demonic tent**les dance wildly. While indulging in one another, the two sisters are going to be sacrificed, each and every nook and cranny of their bodies to be used to breed all kinds of youma… <<less

The main character, Shota, is an ordinary student.... more>>

When he returned home as usual and opened the door, he was transported to a royal palace in a world he had never seen before.

There, he meets the prime minister, Berlina, who informs him that Shota's face looks exactly like the dead prince.

Shota is asked to become the prince of this country and leave behind an heir, so he decides to have s*x with the wizard Torte and the female knight Eclair to make a baby. <<less

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 Great Demon King, once on the verge of world domination was betrayed by their disciples and sealed away. They were resurrected after three hundred years.... more>>

The Great Demon King succeeds in impersonating Aquim, a man who is greatly hated by those around him, begins his quest above all, his favorite delicacy, hatred.

Elena, a beautiful woman with black hair and eyes, dislikes Aquim as his valet, but cannot disobey his orders.

Mina, the ice doll princess who challenged Aquim in order to save Elena, but was captured in the process.

And Mina’s best friend Laura.

When the Great Demon King’s finger moves, these brilliant and beautiful women turn into mere playthings. <<less

Originally supposed to be a storeroom, one day Saino Sōhei’s basement suddenly becomes a grand labyrinth. But this wasn’t your average dungeon, rather it was where one could raise their (Love) Level by engaging in le*d acts with girls.... more>>

Whenever Sōhei acquires a special item from his quests in the labyrinth, he in turn uses them upon girls he likes. But as he further delves deeper into the dungeon, will his relationships with girls change as well……?

This is the story of a boy exploring dungeons, girls and sex! <<less

Keith Blackhound was expelled from his Order for selling voyeur photos. After that, he wandered around doing random business by making weird magic items, occasionally scamming people by selling his failed products.... more>>

One day, after being discovered selling fake love talismans, he was chased by Temple Knights, ending up lost in the Elven Forest. Happening upon several elves being attacked by a basilisk, he went to help them, expecting food as reward.

He successfully repelled it with another one of his weird product and, as wished, received food as a reward from an elven girl’s father.

The father turned out to be an influential person in the kingdom and took a liking to him.

He was recommended to be Court Magician by him and was accepted.

His first duty is to teach Elven Princess Naia, who despite being an elf, is unable to use magic. <<less

Kay Brennan is a hero, no doubt about that. He's the strongest person in their school in terms of combat strength and magical power. Compared... more>> to Kay, Dino Turner - the eternal 2nd place - might as well be nothing, and as such Dino has declared Kay to be his archrival. However, Kay has a secret: she's actually a girl crossdressing as a boy. And Dino is the only one who knows her true nature. <<less

The Magician named Yard was suddenly summoned in different world as a 「Hero」.... more>>

The sorcery in this world is behind compared to Yard who came from another world.

The other summoned heroes are also unreliable.

Furthermore, it is not possible to return to the former world…….

In such a hopeless situation, Yard chuckles to himself.

「Get ready, humans of this world. This world where witchcraft is behind.

I have enormous toy in this box. allow me to play with it」

The Villainous magician named Yard tramples down the other world with overwhelming Dark magic! <<less

Shouji, who was born in a poor family, had the qualities of a “yuusha”. ... more>>

However, he was passing his days as a sloth, drowning himself in alcohol and potions(drugs). While relying on only violence to make a living, he encountered a girl who is a talented alchemist, but also mired in debt.

Potions created by this little girl were mind-blowing as it had the highest purity he had seen. It was a product that was worth loads.

He was through with fame and honor. He no longer had the desire to only make money to live as his purpose.

He felt it wouldn’t be so bad to smuggle those potions in the underground world of crime and drugs.

Brewing this restorative item that gets people high, in search of dirty money and comrades for his gang, hanging onto the potions that let him loose, the mad “yuusha” challenged the demons who are hidden in this demi-world. <<less

Shota Iijima picked up erot*c books during his childhood and suffers from severe foreign sister fetish.... more>>

Thereafter, from the years between his age of 12 to 15, he m*sturbated 999 times. For his 1000th round of m*sturbation, he had been transferred to a different world.

And Shota is sold as a s*ave.

A paradise for women and hell for men… Valhalla, the pen*s mansion. <<less

The setting moves out to the high seas for the second entry in the Harem Series: Harem Pirates (ハーレムパイレーツ)

Ayane, a little sister who loves her brother too much, having her love ran amok, confined Tomoya. She doesn’t want their childhood friend, Sayaka to... more>> take him away from her so she took his first time by reverse raping him, and continued to have baby-making s*x in order to become Tomoya’s wife. <<less

A teen is summoned to another world as the Hero. It turns out the Hero can power up women with his cum.

A princess loses her kingdom and is cursed with a magic spell that gives her one of those famous womb tattoos that makes her constantly... more>> h**ny. While journeying with her childhood friend to bring back their kingdom, she has various, well, adventures behind his back. <<less

“I do not trust humans. They’ll betray you without fail.” Aur, the man who had obtained the ability and right to become the Maou at the end of his life of research.... more>>

Summoning the succubus Lilu, he then sets out on creating his own domain, a gigantic labyrinthine dungeon… The misanthropic Maou taking on the world, the curtain rises on a dark harem fantasy! <<less

Crimson and sweet, the bond of the three.... more>>

Betrayed by her lover and charged with a crime she did not commit, Rosa chooses to end her life by casting herself into the river. She survives this, and wakes up in a mysterious garden where she is met by two vampire girls -- Calen and Trill. They ask her to join their cause and let them drink her blood, to which the woman agrees. However, drinking blood turns out not to be such a simple task. Something is needed. That something is s*xual arousal...

And so, Rosa's days of her body being developed in the hands of the girls begin. <<less

The Main Character finds himself at a beauty salon that acts as a front for succubi to gather s**en as food to send back to... more>> their world and it turns out that the Main Character’s high libido and special c*m might be able to save the succubus world from decline. <<less

Girls on the student council drink what they think is a love potion, but it makes them lactate instead. They demand the only boy on... more>> the student council help them out with that. <<less

A noisy little family, a cheerful group of classmates, and a boy, born on the first year of the lunar calendar living a never changing... more>> life. Then one day he notices a girl in his class shrouded in mystery. Her name is Makina. However, the boy just can’t seem to bring himself to talk to Makina. Then one day, before the first lunar calendar month, another mysterious beauty appears. Her name is Rushia, and as she leans in as if she is going to kiss him, she tells him about a mysterious power hidden inside him called the “Snake Eyes." <<less

This is a story of a four-woman superhero group called the Thunderclaps in a world full of superpowered people called Offbeats.

A follow on from Satou Kuuki's Love Mary hmanga. I would recommend giving that a read before reading this.