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)

A hero undertakes the task of defeating the Demon Lord for the sake of world peace. When he arrives at the Demon Lord's castle, he is greeted by the Demon Lord with a marriage certificate in her hand! The hero is bewildered by the Demon Lord's strong appeal to marry him, but...? A love comedy about a hard-loving Demon Lord and a salt-addicted hero whose world is in danger of extinction!

The Nagare family had a happy home with three parents and three children. However, their son Kiritaka was secretly bullied at school. Then, an incident occurs, and the mother Mari's love for her son goes out of control.

Peter Grill is known throughout the land as the world's strongest fighter. He has a girlfriend who he's steadily trying to get closer with. Life is good for him.

Until he realizes that dozens of women, who want to bear strong children, are all vying for his seed.

Misato-san, a very beautiful office lady who is good at her job, and her boss—Konishikawa-san, a middle-aged man who spoils his subordinates. Misato-san has a strict attitude toward Konishikawa-san, but what are the hidden feelings behind it?! The gap between the seriousness and cuteness will make you faint in anxiety, and this office love comedy with a difference in age begins! (MTL)

After the soldiers' mercenary group where he used to work had been utterly destroyed Loren, who survived the disaster, decided to walk the adventurer's path as a way to make a living. However, for Loren who had no acquaintances and nothing but an empty pocket on him, receiving a single quest seemed like a faraway aim. So, as he was contemplating about what he should do next, another adventurer called out to him.

Saito was reincarnated to the other world at the age of 15, becomes the Great Sage, and defeated the Demon Lord. Shortly after that, the door connecting the other world and the real world opens, and Saitou return to Japan with the power of the Great Sage. However, 19 years have passed in the real world. Saito, who was drifted away for so long, met his childhood friend Kanako, who’s now a single mother. But it seems like there’s someone who’s targeting Kanako’s life… A story of a slow life wannabe Great Sage who came back from another world begins!

Akira Kamishiro was a very successful manga author, who was diagnosed with blood cancer one day. He regretted the way he lived, where he could only build up empty relationships. Angry at his mother for asking him to send her some money, he died in a car accident. He was given a chance to choose his new mother and reincarnate in another world.
Akira, not wanting to have a repeat of his past life, decided to choose an ordinary but safe life.. He was reincarnated as Akira, the only son of a magic store, with his previous life's memories. He had no talent for swordsmanship or magic, but he didn’t care as he was still loved by his family. At one point, he realized that he can embody various things by "drawing a picture". That's when he noticed his cheat ability...!?
This is a story of Akira who wanted to live a mediocre life in another world and his adventures to protect his peaceful place!!

A male engineer transmigrated into another world, and became a prince. This place strikingly resembles the Middle Ages of Europe, but at the same time, it seems kind of different? Witches truly exists, and they even possess magic powers! Magic powers are productive forces! Save the witches, liberate the productive forces! Open map, fight demons, break conspiracies, climb up the science and technology tree, and open the path of hardcore ‘farming’!

From MangaHelpers:
Nogawa Izumi is a good student, and a class representative, but she has an increasingly high libido. It's gotten to the point that she'll claim to feel bad during class, so she can run to the nurse's office and masturbate. When she learns that the Earth is being invaded by aliens that look like people dressed up as animals, it turns out her high sex drive may be able to help protect the Earth. The first time Izumi is attacked by the aliens, she is rescued by Usayama, a bunny alien whose race was their previous victim. Usayama gives her a swimsuit that will allow her to fight the aliens, but which also sends her constant arousal through the roof. The scientific organization that Usayama is affiliated with think that Izumi, with her high erotic level, may be the person they've been looking for to fight the aliens. Will Izumi be able to save the Earth?

“Please teach us naughty things.” One day, Itsuki is transported to another world, where he is confronted by sisters who serve the goddess. In order to return to the real world, he must give them practical sex education!

From Lezhin:
Once a world ruled by men, women stand up and fight to become men's equal. Now, in a land that is equally divided up between man and woman, the battle of the sexes is on! Who's going to win? But more importantly...what's the name of the game?

Negizawa Kamo once tearfully promised his weak childhood friend Kagyu Jubei that he would grow up to be a teacher who would not stand for bullying. Several years later, as a teacher, he meets Kagyu once more under strange circumstances to say the least.

While Negizawa was training to become a great teacher, Kagyu (who, like most women, fell for Negizawa) polished her fists so that she could protect him when they met again.

Hilarity ensues as Negizawa strives to become the teacher he once dreamed of being and Kagyu protects his chastity from the numerous women who lust after his sweet behind.

Like in the famous Osamu Dazai's book "No Longer Human"/ "Disqualified From Being Human" (Ningen Shikkaku) , the protagonist of this story attempts a double suicide with his lover... except he gets hit by a truck and summoned to another world instead.
Now he wants to find his lover, so he can commit suicide with her.

A soft skin, short and coarse fur, tiny feet… What is that strange and cute creature? Hegol (skeleton) is independent and wants to raise a baby cat. He finally got a cat from the human agency service on the day he moved houses! But the baby cat got less fur on it's body… Does a baby cat look like that normally? He cannot contact the human agency service, Hegol takes in the sleeping mutated baby cat! To make matters worse the cries from the baby cat are pouring in number of protests and complains from the neighbors… can Hegol… Can he raise a baby cat? The big nursing Operation of the baby cat inside the Devil kingdom with the skeleton Hegol, the devil Adam and the succubus Lily begins!!!

After drinking too much at a company party, the serious and shy 30-something Ira Megumi finds herself waking up naked in bed next to a younger coworker, Aoki Shun. What happened with Aoki the previous night? And perhaps more importantly, what does she want to happen with Aoki in the future?

In the summer of his second year of high school, the protagonist, Yuushin Tahara, finds that his childhood friend, Miyu Fukagawa, who had moved away, has returned to the house next door. Although Miyu has grown up to be quite cute, there's something a little strange about her... This is a fresh and suspenseful romantic comedy about the gentle protagonist and his cute but rather quirky childhood friend, along with their friends and the adventures they get into!

Wakana Gojou is a fifteen year old high-school boy who was socially traumatized in the past due to his passions. That incident left a mark on him that made him into a social recluse. Until one day he had an encounter with Kitagawa who is a sociable gyaru, who is the complete opposite of him. They soon share their passions with one another which leads to their odd relationship.

"Yukio... I'm going to make a friend." A shy boy named Tetsuo. The only thing he had was a giant robot named Yukio. They became "saviors" in the fight against the galactic monsters coming from outer space. After the final battle, Tetsuo returns to Earth for the first time in ten years and witnesses an astonishing world. It's a frozen Earth (named Snowball Earth), where the entire land is covered in snow and ice, being turned into a deadly world! What happened to the human race? And will Tetsuo be able to fulfill the promise he made to Yukio?

An introverted high school student, Souichi Sakuraba, is being bullied severely by the “Yokai” classmates. The bullying escalates, and Souichi’s childhood friend, Azusa, who was the only one who trusted him, is defiled by them. In front of Souichi, who was in the depths of despair, the succubus, Asmode, appeared. Souichi makes a contract with a succubus who possesses a mysterious ability, and decides to make the bully’s loved ones suffer the same pain as himself by “cuckolding” them. The obscene revenge by “NTR” begins.