Before successfully being able to commit suicide, Takeshi Hirota, a bullied high school boy is transported to another another world where he is accepted by the orcs due to his appearance.

Tatsuo, Hide, Satoshi and Aya worked together to cheat people out of money. They tended to target marriage services, where they con money out of people looking for love. They were good at it, until they crossed the wrong guy. Then they saw the world below the surface of dupes to cheat, when the 'collection agency' came for them with extreme violence.

The person who takes Satoshi and Hide, and then Aya and Tatsuo, is a wild-eyed maniac who seems to get off on the torture. There may be hope for Tatsuo, though, because the man recognizes him. The torturer is "Akasada" a bullied kid that Tatsuo knew from school. Now Tatsuo and Aya have been pulled, against their will, into Aka's world. [tethysdust]

Kaho is busy working hard every day and is exhausted both mentally and physically. Her only recourse is drinking with the handsome Akira, who indulges in drinking, smoking, fighting, and having fun with women. She truly thought they were able to become quite good friends without any romantic feelings between them - until that night...

Mary, a girl who moved from Tokyo to the countryside, meets the mysterious girl Colin in a "secret garden" up in the mountains. With nowhere to go, they share a "secret" in the garden that they can't tell anyone. They didn't realize the consequences of what they did.......

(Source: Yuri-Hime, translated)

With his temptation powers, corrupt the most powerful princesses! A limit-breaking war fantasy story.

"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!

Anezaki Satoru, a Genius had his childhood friend murdered and raped, he then tracks down her 15 killers and he murders them, he then gets sentenced to death for his crimes of murder, after being executed though, he found himself in a parallel apocalyptic world...

High school student Sachiko is bullied daily and is the recipient of constant unpleasant pranks in class. The culprit is unknown, however, in truth, to Sachiko those days were not particularly painful. That is because her beloved Aida-sensei is there to save her. Bright, handsome, and with a strong sense of justice, he is popular with everyone. Of course to Sachiko he is her special hero. However, Aida-sensei has a secret…

The older brother, imprisoned by his sister, dies just as he escapes and is reincarnated in another world!
He thought he had been freed from his demonic sister, but now she too has been reincarnated in the same world...?

WN Raw: https://ncode.syosetu.com/n7437dj/

Asuka and Hotaru are sisters living with their dad and are friendly with everyone in the neighborhood. Although they appear to be a healthy family without a mother, they have a secret that no one could tell. Asuka receives physical and sexual abuse from her father on a regular basis. Still, Asuka is desperate to protect her little sister from the same fate. However, her father's hand begins to be directed at the younger sister more and more... Asuka is cornered and needs to make a big decision!

From MangaHelpers:
This manga tells the story of Hatshepsut, a woman who reigned successfully over Egypt for many years. The story begins when she is a young woman, marrying her half-brother Thutmose II and thus ensuring his rise to Pharaoh. Hatshepsut is a woman with a strong will, who is not going to accept the restrictions others might try to place on her as a woman.

This is the story of Misora Haebaru, an 18 year old karate expert from Okinawa who went to Tokyo to enter the entertainment industry in hopes of supporting her family. She gets tricked into being a gravure idol who wears lewd clothing and is forced eventually to enter the AV world, but she wont go down without a fight.

Ponta anxiously awaits the first big event in his high school life that will give him the opportunity to lose his virginity. A trip to the beach with his friends Taro and Jiro, in the company of three girls, Emi, Rumi, and Chisa. Coupling is done by janken and Ponta ends up with Chisa, the girl of his preference. His plans fail miserably though, when it turns out that Chisa is not so willing as he thought she would be. So, at the end of the trip, unlike his friends who tease him about this failure, he still remains a virgin. To his friends' surprise though, Chisa turns around and asks him to keep in touch.
Thus begins the romance between the two. Their friendship evolves into love, and like in any relationship, there are a few hurdles to overcome. For starters, Chisa is still very innocent and has good reasons not to hurry their physical relationship as much as Ponta would want to. Ponta, who has hopelessly fallen for her, decides to endure this and help Chisa uncover her womanhood.

This is the legendary Go Nagai's breakthrough work. Harenchi Gakuen is an elementary school whose teachers and students are all perverts. Boys peep girls changing. Girls pull up their skirts and show off their panties. Actually, it's not as evil as you imagine. They're like cubs playing together. It's only pre-school eroticism, nothing sexual. In spite of that, Harenchi Gakuen became a sensation. Parents, teachers, and politicians hysterically attacked the comic's immorality.

XX years have passed since the enforcement of "The Human Rights Proper Use Act." In the city, "humans with rights" live prosperously, while "humans designated as livestock without rights" are displayed in shop windows. The humans used as pets, experimental animals, and meat are pitiful creatures living in a world separate from mine... or so it was supposed to be.

The manga continues with the story of Alicia from "A Female Warrior Who Fell to the Goblin Kingdom"...

Five students, 3 women and 2 men, wash ashore a remote island, survivors of ship sinking.

Finding themselves in this extreme situation, their instinct and conscience intersect and collide!
Crossing thoughts, feelings of love and hate mixed with trust and betrayal. A story of uncontrollable libido and murderous intent…

Original R18 web novel: https://novel18.syosetu.com/n1896br/

This is a story of 6 school friends, adults now, who during their school-days were persistently bullying one of their classmates. Suddenly though their quiet lives will be shaken violently when things they wanted to keep secret are coming out to haunt them! Is this the revenge of the bullied classmate and how far will he go?

The Yoshinomiya Municipal High School 2nd year students embarked on what they'd hoped was an educational trip with their friends and away from family but it was not meant to be... Their ship was hit by unexpected rough seas and crashed on a strange island! The surviving students are trying to understand what happened but soon they realize they are not alone on this island and the locals don't appear to be very friendly to strangers!!!

Tanaka was a salaryman who lived an average life. That life came to an end when he was 41 years old…or it was supposed to. But when he came to his senses, he was standing in a world that resembled ‘Medieval Europe’. There was no heating system, and food was eaten with your hands. On top of all that, pigs ran wild in the city…and what did the pigs eat? Shit. And in this harsh world, Tanaka would live his second life as ‘Varian De Lioncoeur’. Will this average salaryman be able to survive?

Links:
Web Novel: https://ncode.syosetu.com/n4662ec/ (Japanese)