A reincarnated boy, Allen, gets granted by a goddess the cheat skill, "Restoration." Even though he can heal all and any injuries and illnesses, there aren't a lot of places where he can use that skill to the fullest, so he planned to "regenerate" the slaves he bought and lead a slow-paced life. But the healed slaves' cheats turned out so out of the ordinary that the crops they tend to and their living conditions turned for the better in a blink of an eye. The protagonist, Allen, who slowly but surely is robbed of opportunities to shine, tried to counter that with his modern knowledge, and yet, those talented slaves absorbed it all and brought success to any and all businesses. The protagonist is becoming irrelevant with each passing day?!

Satoshi Osako was a player of the VRRPG 『Sword and Sorcery』 who defeated the Evil God and died for his troubles. When he awoke again he found himself in a strange unknown forest. Furthermore he possessed his avatar’s body and abilities. In other words, he was a cheat. Can a 40 year old DT, live peacefully in this world?

Let his isekai adventure begin.

The student Nakatani Yuto was supposed to be having a regular life, however his whole class was transferred to another world. All the students gained powerful skills and were worshipped as heroes, but for Yuto who got the unfavorable skill [Absorption]...! ?

The middle-aged man and airsoft enthusiast Daisuke Koga is summoned to a different world on his 40th birthday. Given the ability to turn airsoft guns into real guns, Daisuke must save the other world while traveling back and forth between reality and the fantasy world. Alongside female swordsman Rena, Daisuke becomes the only gun user and dominates in the fantasy world after work!

Da-in, ended up possessing the villain of a story.

To make Stardust — the story's protagonist and his favorite character in a dystopian manga — happy, he resolves to become the villain Egoistic for her growth.

Da-in deliberately causes terror to enhance Stardust's abilities and preemptively prevents all the tragic events from the original story, but in the process, he gains public support while also drawing Stardust's suspicion.

Stardust, who initially opposed him, gradually opens her heart, and soon even begins to show signs of obsession towards him...?

It was in the year 2800 of the Midgard calendar. Back then, there was a Overlord who once reigned supreme and had reached the very brink of subduing the world. Her name was Lufasu Mafaalu, a great woman dreaded as the Black-Winged Overlord. She was too strong, too fast, and too beautiful. However, she was defeated by Heroes who opposed her ferocity, and her ambition was brought to an end.

Or so went the story of our protagonist’s in-game character, whose body he now possesses for some reason in a world 200 years after Lufasu’s downfall. Follow our protagonist as he becomes unnecessarily feared by his surroundings and unnecessarily worshiped by his former subordinates as he―or now she―cheerfully travels around this fantasy world.

Aizawa Yuri has reincarnated 2 times now and is dead tired of being the emperor of this and that. Using his skills he acquired a reincarnation artifact, and starts his life in a brand-new world!

Shim Cheongi threw herself into the sea of Indangsu! What will happen when she wakes up in a lazy dragon's dungeon? Meet many cute monsters while living a delicious, symbiotic life!

Noa Zuiho, a second-year high schooler with amazing tactical analysis skill, is brought to another world!

In order to save this other world from monsters, the goddess gives him the Power of Wisdom, which increases his tactical insight through... erotic actions?!

In an epic war between humanity and monsters, who will prevail? A brilliant strategist rises — with unorthodox methods and adult incentives to motivate his all-female army!

Just like how everyone adored heroes in their childhood, a certain young man adored those powers hidden in shadows. After hiding his strength and living the mediocre life of a mob character by day while undergoing frenzied training by night, he finally reincarnates into a different world and gains ultimate power. The young man who is only playing at being a power in the shadows, his misunderstanding subordinates, and a giant organization in the shadows that gets trampled….. This is the story of a young boy who had adored powers in shadows possibly eventually reigning over the world of shadows in another world.

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.

A 34-years-old NEET otaku is chased out from his house by his family. Unattractive and penniless, he finds that he has reached a dead end in life and realizes that his life actually could have been much better if he had made better choices in the past.

Just when he was at the point of regret, he saw a truck moving at a fast speed straight towards three high schoolers in its path. Mustering all the strength he had, he tried to save them and ended up getting run over by the truck, quickly ending his life.

The next time he opened his eyes, he was already reincarnated into a world of sword and magic as Rudeus Greyrat. Born to a new world, a new life, Rudeus decided that, "This time, I'll really live my life to the fullest with no regret!" Thus, starts the journey of a man yearning to restart his life.

I had been abroad to do medical volunteer work, when I was swept up in a civil war. I was killed by a rebel soldier, while taking a bullet for a patient. But when I finally woke up, I had become a child?!?

And in front of me stood a destroyed carriage and a group of oddly dressed people, who were unconscious!

“It’s just like a Murim world.”

As I hurry to perform first aid in an attempt to save even one person, I realize that this world is that of [The Supreme Demon King], a Murim novel I’ve enjoyed reading.

After meeting the rescue team of the ‘Three Great Doctors’, I found out that one of the person I saved was the protagonist of this novel, the future Demon King ‘Yeoharyun’!

“Hey, since I’m indebted to you for saving me, call me ‘hyung’.”

For saving his life, I become sworn brothers with the future Demon King, and Baekrineuison, one of the most knowledgeable people around, recognized my potential and took me in as his disciple. This is the story of how I became the greatest physician in Gangho!

When he realized it, the protagonist was in another world and had become a sword that was stabbed on an altar in a great plain, crowded with devil beast. The world he was in had a game like system; HP, MP, Strength, Vitality, Agility, Intelligence, Dexterity, Titles and Equipment. Following his instinct as a living sword, he traveled to find the one who could be his wielder, until he met with a cat girl that was about to be attacked by a bear type devil beast.

Orginal Webcomic

Tsurumi Asuta is a 17-year-old second year high school student. He was an apprentice cook working at the public diner "Tsurumi-ya" that was managed by his father. One day, Tsurumi-ya is hit by fire and Asuta dived inside the burning shop in order to save his father's santoku knife which is said to be his father soul, where he found demise.

When he came to, he was in the midst of a strange jungle. He was then attacked by a beast resembling a boar, but Asuta was saved by a girl named Ai Fa claiming herself as part of the "People of Morihen." It was then that he realized he was in another world.

Who knew that even a stationary plant could be surprisingly capable?!

Our protagonist is a saint—or was, until she was betrayed by one of her fellow saint apprentices as well as her fiancé, a hero.
In her final moments, she recalls her previous life, when she was just a normal Japanese high school girl, but that doesn't help the fact that she's being eaten alive by a massive plant monster.

And yet, by a stroke of luck, she doesn't die for good, but instead reincarnates as said plant monster. With the upper half of a human and the lower half of a plant, she must now spend her life as an Alraune.

And so, she tries to live the peaceful life of a plant, photosynthesizing all day!
Welcome to the diary of a plant girl who just wants some peace and quiet, but something always gets in her way!

Web novel: https://ncode.syosetu.com/n4444ge/

An 18-year-old girl who lost her family in an accident, Yamano Mitsuwa falls off a cliff one day and transferred to a different world with a civilization level of medieval Europe. Mitsuwa who discovered it was possible to go and return to Earth after a deadly fight with wolves decided to live in both worlds.

「For security in old age, I will aim for 80,000 gold coins!」

I will try not to let strange things circulate to not distort the progress of the world, but I won’t hold back for the sake of my easy life and safety!
While wearing three handguns along with words and deeds that appear decent, in her head Yamano Mitsuwa is a sly girl. Making an effort to make money even with a small body that looks like a child to Westerners!

Oh, my secrets are too dangerous, is that so? It’s all right, it’s fine! I’ll teleport away when push comes to shove!

Meet the Evil King Valt, ruler of the Continent of Darkness. After being defeated by a group of heroes, he was reborn as a human, with his powers intact!

"I'll start over in this world. And this time the whole world will be mine!"

Valt garners the attention of the elite adventurer Iris. With Iris as his guardian, he enrolls at the Royal Adventurer Training School and immediately surpasses his seniors with his abnormal power! In an unprecedented move, this maverick is designated "level 0." He goes on to employ his talents as an Evil King to great effect, dominating the new world he finds himself in...

From MangaHelpers:
29-year-old programmer Suzuki Ichirou finds himself transported into a fantasy RPG. Within the game, he's a 15-year-old named Satou. At first he thinks he's dreaming, but his experiences seem very real. Due to his use of a 3-time-use special power (meteor shower), he ends up wiping out an army of lizardmen and becoming very high level. He hides his level and plans to live peacefully and meet new people, though developments in the game story (like the return of a demon king) might get in his way.

“O, Hero!” With that cliched line, Kazuya Souma found himself summoned to another world and his adventure-- did not begin. After he presents his plan to strengthen the country economically and militarily, the king cedes the throne to him and Souma finds himself saddled with ruling the entire nation! What’s more, he’s betrothed to the king’s daughter now?! In order to get the country back on its feet, Souma calls the wise, the talented, and the gifted to his side.Five people gather before the newly crowned Souma. Just what are the many talents and abilities they possess… What path will his outlook as a realist take Souma and the people of his country down? A revolutionary transferred-to-another-world administrative fantasy series starts here!