Kosuke was killed by Truck-kun, and was given the ability to live in a new world. Additionally, he was provided two lovely assistants who would do anything for him. This is a story of his adventures with them.

"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. 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!

Lucas has a hard life. In his mid-thirties, a mixture of failures has left him old and crippled, playing pack mule to a couple of young adventures.

Then one day, he pulls a magic sword from a stone that tells him he has been chosen to become a hero. Given a youthful form, Lucas must use the power of the sword to vanquish evil and attain a massive harem.

Before you ask, it’s not isekai because he’s been in this world from day one. It is wish fulfillment, though, so in the end it’s basically the same thing.

Mahiro's father has remarried and Mahiro is supposed to live with his new family including honor student Rei who is in the same class with him and believes "a guy who thinks of nothing but sex shouldn't be allowed to live together with her." Her words enrage Mahiro and he began to distance himself from her and on that moment, an unexpected reaction from Rei....?

One day, school teachers come as freeloaders to the inn run by his parents!? Kazami Hiro, a high school boy, decides to take care of the inn and his future!? Under one roof, The forbidden harem romantic comedy begins!!

Indigo island is a place like no other, to deter emigration and attract tourism they have become the 'sex' destination as residents are punished if they are not have having frequent sex! On this crazy island, Hitori Misaki is still at school and one of the rare virgins trying to keep her secret and find love in such a lewd environment! The manga is based on the adult game "Nukitashi - Is this island Utopia or Dystopia?" by Qruppo!

Seven women, one man, a suspenseful harem story!

During a class reunion, the school became an enclosed dimension without warning. Yelling and screaming brought no response. 26-year old unemployed Haruka Sato has to survive by cooperating with seven of his former classmates. Soon, the extreme conditions began to eat away at their sanity, and Haruka's hidden desires began to take hold.

The protagonist along with his step-mother, and 2 step-sisters are summoned into another world where demi-humans are the rulers as saviors, but its not to fight against a demon lord, its to fight an Undead Apocalypse monsters called "Dead Mell" that have overrun the world and that can only be killed by using weapons made with holy silver.

For that, a familia is made (group of 4 people) with them being the swordmaster that uses the holy sword, the guardian that uses the power of earth to protect, the healer that use the power of water to heal and the black mage that uses the power of fire to destroy.
The role of the guardian, the mage and the healer is to support the swordmaster that can only kill the monsters.

But to use magic powers one must offer part of your being as a sacrifice to form a contract with spirits, and the higher the sacrifice, the higher the power. Now they must choose who are the 3 that need to sacrifice part of their bodies to gain power and who will wield the holy sword.

When the Devil King announces his retirement, he calls forth his two sons, Yomi and Sora, to give them each a quest. Whichever of them finds a pure Yamato maiden within a year would inherit the throne of the Devil King, while the other would die. Thus begins Sora's sex-fuelled adventure to find a woman that can satisfy his father...
(Sakigake!! Otokojuku Wiki)

This apartment complex has a problem with perverted women!

Yoshida is a tiny, frail highschool graduate who became an unwilling manager of an apartment complex when his father, the former manager, injured himself. Unbeknownst to him, this apartment complex houses quite a few women with very... unusual sexual preferences. This becomes a problem when a mysterious entity begins giving "Libido Cloth" to these women - skimpy outfits that give them superpowers and cause them to go on lewd rampages! Will Yoshida be able to stop them?

Himawari-chan, the Little Princess of the school-bag planet called "Girl's Elementary School Star" at the edge of the universe, has come to the Earth to find a husband.
With the help of her maid, Sakura, Himawari-chan will start developing a bond with the earthlings.
and with the big-breast Osananajimi, Kaguya as an extra, the Kawaii Bishoujo meteor love comedy now magnificiently dispatched.

A man who yearns for freedom is reincarnated and he chooses the undesirable job "Carrier"--The fastest way to conquer both women and other world with wisdom and courage! A new erotic fantasy series from Nocturne Novels!

Fujinomiya Soujirou is transported to a fantasy world with only his Daisho (pair of samurai swords) in hand. The katana can talk and swiftly informs him that it is Hotarumaru, the legendary national treasure of Japan thought lost during World War II. The wakizashi is to young to have a voice, to Souji names it Sakura. This is the story of Souji and Hotarumaru's journey through a new world as he seeks to achieve ... a sword harem?

One day at school, Youta Tada sees someone strange entering school. Out of nowhere this being appears next to him and makes him fall from the third floor! But before he hits the ground, he wakes up in a strange world where beings like dragons exist! Youta then meets a young paladin named Lumi and discovers that he is the only man on the entire planet, and also that its inhabitants are extremely 'weak' to his presence or more specifically, his touch. Would this be a paradise?

Amona, a dark summoner and demi-human who uses demonic powers,
is the newest addition to the party of the uptight priest Roni.
Everyone expected the two to dislike each other and to have nothing to do with each other.
But to their surprise, on their first day together as an adventuring party, they had a one-night stand...!

From Friendship Scans:

Beginning of 16th century, Alexandra was captured by slave traders in Ukraine during one of their many raids. When the traders arrived in Greece to sell the female slaves, a young handsome man named Mateus bought her and promised to give her true freedom. He hired countless teachers, scholars, and palace ladies to train her into the one perfect woman of her time.

Mateus's kindness has caused Alexandra to deeply fall in love with him, and she secretly wishes to be his concubine. But cruel fate! Mateus has already promised her to his best friend, who is Suleiman the Great, Emperor of the Ottoman Empire! Mateus promised Alexandra of true freedom, but where is freedom when she is in another man's harem and can only look at the one she loves from afar?

Not willing to endure this agony, Alexandra promises herself that one day, she will free both of them from their bird cages. But Mateus is the Grand Vizier, a power only second to the Emperor himself. So Alexandra must become the most influential concubine in order to have any hope—which also means bearing Suleiman's son. However, Suleiman already has a son by another concubine, and this woman is determined to keep her son as the only prince and only heir.

Thus begins the story of a slave that becomes the story of one of the greatest empresses of all time, Alexandra, the woman who would one day be known as Roxolana, Empress of the Ottoman Empire.

A man who has been reincarnated in a different world acquires the vocation of "pole master" in the new world! However, that special ability is not used to defeat enemies, nor to gain power, but to embrace the beautiful girls who appear one after another with all one's might! A unique story of conquering another world begins here!

The protagonist, “Sao” has been reborn with his memories from his past life. He’s born as a son of a rural villager, but his true identity is a reincarnated person with cheat abilities and the knowledge of the modern world. With the class “Rod Master,” he received as he grows up, and the many skills that came up with it, he can defeat enemies, help people, and even for sex.

Ostracized and tormented by his peers to the point of breaking, Kazuhisa Kaya set off into the nearby forest atop the mountain with one purpose: to dig a pitfall and bring about the death of the person behind his suffering. However, right when Kazuhisa was about to succeed in his revenge, a sudden earthquake throws his plans out of whack! Caught unaware, all he can do is patiently lie in wait until someone lumbering across the path happens to fall into his trap. Kazuhisa’s excitement is short-lived, however, as the corpse at the bottom of his pitfall turns out not to be the bully he was expecting but a grotesque, pig-looking monster, and his confusion only grows as he’s suddenly greeted by a pure-white room and a RPG-like status screen.

Strange monsters now wandering the mountain and with newfound powers at his disposal, Kazuhisa is forced to throw all concerns over his tormentor to the wayside as he focuses on a new goal: survival. That’s not going to be as easy as it seems, however, as he’s not the only one to have been wrapped up in this mess…

Controlling the Queendom of Sevek’s female prison with the Power of the Kraken!

From the author of Akame ga Kill and Mato Seihei no Slave!

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