Gu Yangchun, who betrayed the Orthodox sects, became a demonic human under the Heavenly Demon.

Living as a demonic human, he led a life filled with regret. He committed countless evils not of his own accord, but under the orders of the Heavenly Demon.

In the Great Orthodox-Demon War, thanks to Wi Seol-ah, who cut down the Heavenly Demon that made even the three supremes of the Orthodox forces kneel, Gu Yangchun was taken prisoner by the Orthodox forces and suffered for his sins.

With whatever morals he had left in him, he died giving Wi Seol-ah information about the Demon Cult due to a bind the Heavenly Demon had placed on him.

Then, for some reason, Gu Yangchun regressed to when he had first met Wi Seol-ah. Realizing the regression was not a dream, Gu Yangchun decided to live a quiet life. However, bad ties from his previous life began to draw near, one by one.

Hit by a truck and reincarnated in a different world, then a beautiful woman greets me "Long time no see Master"

Restart in Easy mode from level 1 in the peaceful world that I once saved!
Follow the world's strongest sage maid, train slave girl to be strong, convert thief girl, get more friends! Even the luxurious residence and the strongest equipment remain as you wish!

Be the most powerful in this new game!

In the final battle against the evil Exterminators, Asagaki Tougo, a power ranger, traded his life for the enemy's. It seemed like everything was over, but suddenly he found himself in another world! He becomes an adventurer, transforming into Kizuna Red, and continues fighting to save people in trouble! Here he meets a young Wizard named Idola and his journey in this new world begins!

Shirosaki Reito was suddenly sucked in by a mysterious crack and got transferred in between dimensions. He got reincarnated as a baby in another world. He was born in the royal family and was the heir to the throne, but he was driven/kicked of the palace. The reason was that he was born as a Support magician and had Alchemist as a job which was the lowest job that existed in the new world and people who had that were considered jobless. But there was a secret hidden in that job!!
From jobless to the strongest job!!!

Mahato is a former corporate slave who has been reincarnated into another world.

Through an incredible coincidence, he tames a large number of Dryad - fairies who bestow blessings upon plants and vegetation - and his stats become instantly boosted to MAX! Using his now-overwhelming power, he even makes friends with a dragon. With his newfound friends, he begins living out his dream of being self-sufficient.

He soon discovers that the crops he grows in his vegetable garden not only have the ultimate flavor, but they also grant unbelievable effects to those who eat them, like enhanced eyesight and eternal youth! And with the factory he builds using his skills, he's even able to produce beer and soy sauce?!

Thus, the unknowingly strongest protagonist begins his surprisingly slow life of farming!

An abused little girl with nothing to live for meets an old man with a nasty personality

From Stiletto Heels:
Benzo and Soji witnessed the death of Tatsugoro, leader of the Akame Gang. Tatsugoro's last words to them were "I'm leaving you two in charge", but it was Jinzaburo, the former leader's friend, who was chosen instead. Displeased with Tatsugoro's wife's decision, the two left the gang. They then set off on an aimless journey, vowing to accomplish something big.

Seth is an apprentice sorcerer from the Pompo Hills. Like all sorcerers, he's an "infected", one of the few people having survived an encounter with a Nemesis, those creatures falling from the sky and destroying everything around them. Being immune to them, Seth wants to become a Hunter and fight the Nemesis. But what Seth really wants is to find the source of all Nemesis, the Radiant. Helped by his fellow sorcerers, he will seek the Radiant, under the harsh scrutiny of the Inquisition...

In the year 200X, a Japanese fleet consisting of 3 vessels leave on a mission to South America. After encountering a storm, the ship JDS Mirai find itself without its escorts and in the year 1942, traveling towards the island of Midway to face the American fleet in one of largest battles in naval history. The crew of the Mirai must decide whether or not to change the course of history by involving itself in WWII.

Won the Kodansha Manga Award for general manga in 2002.

A college student, Sakurai Hiroki was summoned to another world to defeat the Demon Lord. And since he got “Priest” as a job, his starting Recovery Stat was more than enough to heal any wounds, so he dumped all of his Stat Points into Evasion. In other words, he’s aiming for an Evasion Healer who will never get hit by enemy attacks. But unfortunately, people in that world couldn’t understand his ideal! The King got angry at him and almost immediately labeled him as useless! And thus, the story of how Hiroki become an odd Healer who can even avoid Dungeon Boss’ attacks with ease has started!!

His only family, his younger twin, has been murdered. He isn’t as talented as his late genius brother, but in order to get his revenge, he will become “strong”. Will I be able to get my revenge?

When an entire bus of people are summoned to another world, Souma Nagi doesn't go along with the idea of being a Hero like the rest. Thus he leaves the palace and starts his life in another world with his ability to restructure skills. Based off the Light Novel by the same name.

Lerunda has always been treated unfairly, constantly compared to her twin sister, whose personality is bright and beautiful. One day Lerunda was thrown away into the forest, abandoned by her parents when her sister was taken over to the Great Temple as a child...
In disappointment, the strongest monster Griffon in the forest and a Sky Horse helped her lonely person...

Alternative Raw: ComicWalker

Amamiya Hiroto is unlucky. His life consisted of misfortune after misfortune, culminating in an unlucky death during an incident on a school boat trip, trying to save a girl he barely knew. After death, he met a god of reincarnation who requested that the hundred or so dead passengers - one of them being the girl he tried in vain to save - be reincarnated into another world.

Yet a series of unfortunate events forced Hiroto to reincarnate with even less luck than before, starting with nothing but a tremendous amount of Mana. His second life, far worse than his first, came to a cruel end.

However, upon meeting the god a second time, he was informed that there would be yet another reincarnation - one that had already been set in motion and could not be stopped. Not wanting Hiroto to endure a third life filled with suffering, the god cursed him before he was reborn in the hopes that he would either die quickly or commit suicide.

Hiroto was reborn once more as a half-vampire, half-dark elf. A dhampir. Not wanting a fourth life, he is determined to live this third life with the only things remaining from his previous lives - Death Magic and his enormous Mana pool.

“It’s safe because it’s a desk job, super stable because it’s public work!” But what awaits Alina, who has become a guild receptionist, is a far from what she had in mind. And it’s all because of the adventurers inability to conquer dungeons! Having reached her limit, Alina sets out to defeat the boss herself, hammer in hand…

Wisteria is an orphan girl living in a corner of the British Empire at the end of the 19th century. Her life is desolate and bleak–until she encounters Malbus, a powerful but equally lonely immortal being with a furry appearance, hounded by hunters. Together, Wisteria and Malbus roam the Empire–populated by humans and human-like beasts–in search of a place where they can live together in peace.

Sakra, the last surviving princess of a fallen kingdom, is being hunted down for the power of Ambrosia she possesses - the ability to grant divine strength, but only to a human. With no human companion, she decides to summon one from another world in a desperate attempt to find a knight to protect her, but the man who answers her call is less than what she had hoped for.

Manga adaptation of LN 7 of Mushoku Tensei

After losing his girlfriend to a brave hero, Toru is expelled from his S-Rank party. With a feeling of sadness and pain in his heart, he defeats a demon he meets outside the city, and his ability [to save experience] is broken! Toru becomes level 300 in the blink of an eye! With this power that far surpasses that of heroes, there is nothing that can stop him. Kaede, a slave he met on his journey, forms a group called the "Mangyu Brigade", and easily completes dungeons, acquires the legendary sacred weapons, and thanks to his skills, his friends level up easily! He rescued a countess who was attacked by bandits on the road, and befriended a legendary beast. Oru's journey continues at a leisurely pace, as he repeatedly encounters various people along the way, while his former party of heroes are deprived of opportunities to play an active role and fall into decline. This is the beginning of the life of a 300 level warrior!

Original Webnovel: https://ncode.syosetu.com/n9483ge/

The story is set in the modern world, but there exist doors that can take people to the "other side," where strange urban legends and internet stories prove to be true. College student Sorawo Kamikoshi finds herself exploring one of these doors, and almost dies on the other side, when she is rescued by another girl named Toriko Nishina. Toriko is mysterious girl, but very skilled with a gun, and she seems to be searching for someone else on the other side. Together, both girls start to explore these doors to the other side.