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)

Keitarou, who's always had a disposition for attracting spirits, gets hired as a tutor for a little girl named Yayoi who can see spirits and is searching for the spirit that took away her mother.

His only purpose was to protect his master. And yet he was powerless to protect her. But fate has more in store for him as he gets another chance to protect his master once more and change his destiny.

Jinhyuk, a gaming Nutuber, was the only person who saw the ending of the game "Tower of Trials".

However, when the game’s popularity declined, it became difficult for him to continue making a living as a gaming Nutuber.

Since he already saw the ending of the game, he was about to quit playing. But that day, "Tower of Trials" became reality, and Jinhyuk, who knew about every single thing in the game, took over everything faster than anyone possibly could!

“I’ll show you what a true pro is like.”

Everything in this world is absurd. The heroes who pretend to fight with grace, the minor villains who can only commit petty crimes, his classmates who always hang out in groups… and his own weak and miserable self.
And so the boy yearns to change everything, not only himself but also the world—for he will become the lonely, the aloof, the supreme "Greatest of all Villains"!

By the creator of "The Girl I Like Forgot Her Glasses," Fujichika Koume, comes a new story, a story about Villains!

All the members of my sect are abnormally strong. All my disciples turn out to be big shots, and I'll definitely become invincible in this world!

Im Dajun is a high school student who gets bullied at school every day. He came across an interview on TV just when he was on the verge of giving up on life. It was with a murderer who killed the classmates that bullied him. Dajun becomes inspired by what he saw and decides to take revenge as well.

His revenge was successful. However, his life steered into an undesired direction. Im Dajun, leaving school, ends up joining a strange Runaway Fam.

The young runaway, Im Dajun, no longer suffers from the bullies at his school. Instead, he now must survive against even more vicious thugs on the streets.

I, a corporate slave, transmigrated into a game as a noble. But I'm just an extra that will die at the hands of the villains in the future? No way. I'll somehow reform them and live a lavish life! For this I started sponsoring the future villains to prevent them from turning evil and helped them overcome their difficult circumstances. As a result, they all grew up to be upstanding and ordinary, enough to make me feel proud. And so, I became the ultimate mastermind of the kingdom... Huh?

The series follows 4 hostesses at Club Rose and their relationships. It’s directed more towards an adult audience but manages to sneak in just enough cute to make it fun as well.

Penelope Eckart reincarnated as the adopted daughter of Duke Eckart and the villainess of a reverse harem dating sim. The problem is, she entered the game at its hardest difficulty, and no matter what she does, death awaits her at every ending! Before the "real daughter" of Duke Eckart appears, she must choose one of the male leads and reach a happy ending in order to survive. But the two brothers always pick a fight with her over every little thing, as well as a crazy crown prince, whose routes all lead to death. There's even a magician who's enamoured with the female lead, and a loyal slave knight! But somehow, the favourability meters of the male leads increase the more she crosses the line with them!

This is Penelope’s survival story, who’s been dropped in an insane reverse harem dating sim!

The virtual reality game “History of the Archana Continent” became part of reality, and “players” who were synchronized with humans appeared to protect the world. Lee Hoyeol, who was an ordinary salaryman, took over the body of the character he created in middle school, “Grandfell Claudi Arpeus Romeo.” Under normal circumstances, it would have been an absolute failure of a career, but Grandfell, whose occupation is a “demon hunter,” becomes extremely proud in front of demons! The only demon hunter in this world, Grandfell (= Lee Hoyeol) starts to make a move!

“The Hero defeated the Demon King in the war of men against demons…” Those kinds of stories are a thing of the past. Nowadays, adventurers, demons, Heroes, Demon Kings, and so on are all occupations that no longer involve putting one’s life on the line. Peace has returned to the world, and dungeon exploration has now become a form of entertainment. Adventurers and monsters now all fight using clones they’ve created with magic in an extremely popular form of dungeon clearing where nobody dies. The footage of the dungeon getting cleared gets broadcasted all across the continent, and I’m a member of a Hero’s party that was ranked the 4th most popular in the world… but not anymore. Parties had a limitation of 5 members, and I was told that an unpopular job like Black Sorcerer would only get in the way of getting to 3rd place or beyond.

Now that I became unemployed, I was forced to find another party but I just couldn’t find one. One day, I encountered a beautiful blonde red-eyed woman who told me she had a job for me. After being so touched from having someone recognize my abilities far more than my past comrades, I ended up agreeing to take an interview without asking for the details. When I arrived at my destination, I was at the world’s hardest dungeon where no party has ever reached the final area, the Demon King Castle, where the Big Four and the Demon King were waiting for me. This is the story of a Black Sorcerer that was kicked out of a Hero’s party and joined the side of the Demon King Army to repel the Heroes. (Source: Novelupdates)

Or
Please read the title again.

Artist's Twitter (NSFW): https://twitter.com/kana_kkn
Orignal webnovel: https://ncode.syosetu.com/n4836fm/

After diligently following the “demon king’s standards,” I ended up getting killed by the heroes.

What, my tower and I are a custom-made hunting ground for heroes now?

With this chance at life regained through regression, to hell with the damn demon king’s standards!

This is the story of surviving as the hard-headed(?) demon king, Berje!

One day Kang Songhyun opened his eyes on the Azul Continent.
He didn’t know the reason.
When he woke up he was no more in South Korea.
He’s thrown into a fantasy world.
‘Why did I come to this kind of place?’

At that time, the status window pops up in front of him
[Your job is ‘healer’?]

But among his skills…
‘huh? …No healing?’
That was the beginning of the life of an unlicensed healer. A healer who does not know how to heal.

Kang Songhyun is good at everything except healing
In a fantasy world as an unlicensed healer his story of survival begins.

A Twitter series about a handsome salaryman and an unapproachable office lady who dress completely different when they are off work.

Kenjiro, a first year high school student, has had a crush on Tozaki-san, who is in the same class with him since the beginning of school. Tozaki-san is kind to everyone, but for some reason, she only has a cold attitude towards Kenjiro.

The story of two foreign men living in Japan.

(from ebookjapan):

Nick, with his stylish hair, and Lever, with his dazzling eyes behind his sunglasses, are a HOT & CRAZY foreign duo who will face any obstacles that come their way!

The genius Kyogoro Miyata, who wastes no time in drawing, unleashes a shocking high-speed manga. Nick and Lever are finally here!

Every time she opens her mouth, it's nothing but abusive language, and her problematic behavior never stops. The protagonist has had enough and sets a “plan” into motion…??!

Liz who remembers being dumped by her lover in her previous life decides to live freely in her current one.

Holding a mysterious power, she was invited to the palace as a saint candidate where she meets with the crown prince who was actually her former lover from her previous life.

Though Liz looks to be the weakest among the saint candidates she is (likely) the strongest among them.

What happens when two yandere stalkers fall in love with each other?