There was a mage called ‘The Lone Demon King’ at the frontier.
He was just a creature that never grew old, but he was loved by the villagers as something of a guardian deity.
However, he was destroyed by a magic organization that sees his existence as dangerous.
200 years later, he is reincarnated as the second son of an aristocrat and obtains the strongest magic power.
“Let’s pretend to be a human this time”
However, being a human lover, he didn’t particularly think of revenge and has decided to pretend to be human in this life.
In his past life, he was the guardian deity of a region, and in this life, he’s a local aristocrat, but he does not know common sense. He doesn’t know how to take it easy.
As the second son of an aristocrat, he is loved by his family and friends, and while he is regarded as a master of magic in the magic guild, he becomes an ‘Immortal Mage’ behind the scenes.

Webnovel Raw: https://ncode.syosetu.com/n9450fl/

Wang Dokpil, the boss of Jeolhwa, the largest organization in Chungcheong, and his son, Wang Dam. After his father’s death, Wang Dam has a different dream than inheriting his father’s organization and decides to head to Seoul on a whim. But life isn’t that simple, as he envisioned his uncle, who was a member of the organization, proposes a condition that if Wang Dam becomes No. 1 in his new school, he’ll receive a settlement allowance. However, Wang Dam’s new school, notoriously known as Ppak High, is infamous for school violence. Can Wang Dam become No. 1 in Ppak High School, the one full of the nation’s worst troublemakers?

Park Hyung Suk, overweight and unattractive, is bullied and abused on a daily basis. But a miracle is about to happen.

I want an S-Rank skill too! I want it so badly, I could die for it!

[You have awakened an S-Rank skill.] [But it only works when you die.]

HUH!? WHAT’S THE POINT OF GETTING ONE IF I DIE !?

1st Trailer: https://www.youtube.com/watch?v=Sz51IU05F88

Ordinary office worker Oohashi Rei wakes up in the body of the protagonist of her favorite otome game, Revolution. To her delight, the first person to greet her is also her favorite character, Claire Francois–the main antagonist of the story! Now, Rei is determined to romance Claire instead of the game’s male leads. But how will her villainous lady love react to this new courtship?!

Links:
Author's Twitter: https://twitter.com/inori_narou - Tweets in English, Japanese, and Korean.
Artist's Twitter: https://twitter.com/aonoesu - Tweets only in Japanese.
Official English Novel: https://sevenseasentertainment.com/series/im-in-love-with-the-villainess-light-novel/

One day, Baek Woo-hyun, an ordinary college student, returned after being transported to the dimension of Reverse Planet, the world’s most popular online virtual-reality game.

He had dreamed of coming back… but the damn game was still running as if nothing had happened, and the ghosts of the comrades who died “over there” kept urging him to avenge them at every turn.

In the end, Woo-hyun logs back into Reverse Planet to uncover the connection between the game and the other world. Fortunately—or perhaps unfortunately—he doesn’t get sent back “over there,” but he happens to appear on the stream of a certain streamer he meets by chance… and an anonymous viewer, Viewer 62, reaches out to him.

― How does it feel to have returned to reality?

King Grey has unrivaled strength, wealth, and prestige in a world governed by martial ability. However, solitude lingers closely behind those with great power. Beneath the glamorous exterior of a powerful king lurks the shell of man, devoid of purpose and will.

Reincarnated into a new world filled with magic and monsters, the king has a second chance to relive his life. Correcting the mistakes of his past will not be his only challenge, however. Underneath the peace and prosperity of the new world is an undercurrent threatening to destroy everything he has worked for, questioning his role and reason for being born again.

Official English Novel: https://tapas.io/episode/571162

The story begins when the gods call a convention to decide the whether to let humanity live or die, and settle on destroying humanity. But a lone valkyrie puts forward a suggestion to let the gods and humanity fight one last battle, as a last hope for humanity's continued survival. 13 gods will fight against 13 human champions in one-on-one battles to decide whether humanity lives or dies.

In 2019, the manga ranked 20th on the 5th Tsugi ni Kuru Manga Awards in the Print category.
The series ranked 5th on the "Nationwide Bookstore Employees' Recommended Comics of 2018". It placed 12th on the "Nationwide Bookstore Employees' Recommended Comics of 2020".

One day after summer break, the perfect young lady, Sana Tsukuyomi, showed up at school as an undead. As a school health committee member, I, Hiyoshi, ended up helping her navigate her daily life, despite her movements being as stiff as a corpse’s… A school romantic comedy featuring a heroine who’s both scary and cute!

[Would you like to reverse time?]
[All your abilities will be reset.]
[Please choose the date.]

“February 28th, 1985. The day I was born.”

Financial power. I will gather all the fortune of the world—
and create a monopoly. I will monopolize all the dungeons of the world.

I will do this now, while the world is still peaceful...
before it all begins.

For Paula, not a single day passed by without a reminder of her ugliness. But it was her hideous face that spared her from being sold to a brothel or dying tragically like her sisters. So when Paula's father sells her off to work at an esteemed nobleman's mansion, she realizes that peasant girls are a disposable resource. However, she finds the young Count Belunita tucked away in an annex, shamefully hidden from the curious eyes of the public. And as Paula struggles to appeal to her tyrannical master's whims, she must also embrace her role as his secret maid.

After being defeated and captured, the dragon slayer Leon became a captive of the Silver Dragon Queen. With the awareness of death, he used forbidden magic to curse the queen, but unexpectedly, the queen lost control.

He thought that this would make the queen live with shame for the rest of her life, and it would be worthy of the dragon slayer's mission.

But two years later, when Leon opened his eyes, next to him was a little dragon girl with a tail...

Olivia is picked up by a death god, Z, deep in the forest as a child and trained by him in combat for reasons unknown. One day, Z disappears, leaving behind a letter instructing Olivia to head to the Kingdom along with a sword bearing the qualities of a death god's weapon. Thus, the girl lacking in common sense, knowledge, and normalcy sets off to join the army.

In another world, the Hero and the Demon King continued to oppose each other. As their great magic collided, the explosion crossed over worlds and destroyed a classroom full of high school students. The victims who died in that explosion will be reincarnated in that alternate world. Our heroine, who has the lowest standing in the class, was reincarnated into a spider. She nevertheless faces this challenge head-on with great determination, and adapts to it surprisingly quickly. This is the story of how our protagonist, who was reborn as a weak spider monster, does whatever needed to survive.

Due to global warming and rising sea levels of the early 21st century, humanity lost much of the Earth's landmass. At the same time, fleets of powerful sentient ships of unknown origin armed with advanced technology and weapons, known collectively as the "Fleet of Fog", mysteriously appeared and easily vanquished the world's naval forces. The Fleet of Fog impose a worldwide naval and aerial blockade, and thus preventing humanity from traveling across the seas.

Seventeen years after the battle, for some reason, Gunzou Chihaya and his crewmates aboard the I-401 and the personification (Mental Model) of the I-401, Iona, started fighting the Fleet of Fog...

Percival, a kind boy, lives with his grandfather in a remote place called "God's Finger". However, the world will not allow him to live in peace. An encounter with a mysterious knight changes their fate, and a shocking secret is revealed. The boy sets out on an endless journey. Whether you know "The Seven Deadly Sins" or not, you can still enjoy it! The world's most awaited adventure fantasy!

Sakuma, a teacher at an all-girls school, sees his wife in the red-light district cheating on him one day. In response, he runs away and decides to tour Japan, going wherever his heart may lead him. He finally reaches Odawara and meets a young girl, that looks like the one he always sees in his dreams. He barely manages to stop himself from crossing the line with the girl, and he eventually returns to his normal life, having discovered that his wife's alleged cheating was all a misunderstanding. But then...

“This party doesn’t need an incompetent magician who can only use supportive magic. You’re fired, Alec Yugret.” Suddenly, Alec, a court magician who had joined the crown prince’s party to help him conquer dungeons, was banished from the party. And not just the party, but the crown prince’s harassment has banished him from the royal palace as well, and a friend from the “magic academy” approached Alec, who was at his wit’s end. “Hey, Alec. Do you want to try to conquer the dungeon with us again?” And so, together with the friends he used to party with, Alec begins his second journey in life.

This is the adventure story of a former court magician who had been abandoned.
Four years ago, the “Lasting Period,” a party of four that had been called “legendary,” has gradually spread its name around the world.

During his second year of high school, Haruto Otsuki starts a part-time job in housekeeping during the summer vacation. His first client turns out to be none other than Ayaka Tojo, the most beautiful girl in school! Despite being bewildered by this unexpected turn of events, Haruto continues doing his housekeeping duties. Over time, he becomes well-liked by Ayaka's family and begins regularly visiting her house. From making home-cooked meals that delight Ayaka, to going grocery shopping together like a newlywed couple, and even going on shy movie dates like young lovers, they begin to grow closer by spending these special moments outside of school.

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