The protagonist, Inaka Yuuji, was ran over by a truck because his awareness was dulled from overworking.

“Ahー, with this I don’t have to work so much anymore. I want to spend my next life leisurely……” was the wish Yuuji blurted out, He met God and it was decided he will be reincarnated in the countryside of the otherworld. He became Alfred Slowlet, 2nd son of a countryside noble, will he be able to enjoy and leisurely spend his slow life in the countryside?

Professor Noah Minami Umberbach is not your average archeologist! For one, he's prone to whipping out his gun and blowing up stuff to make dramatic entrances. But that's just his eccentric nature and he's a man on a mission. A mission that may very well be the most important mission of all time. And he's dragging unlucky student, Kotobuki, along for the ride!

Shinichi Kudo is a high-school student who, by using observation and deduction, is good at solving mysteries. While investigating one, he is caught by the criminals that he was watching and forced to take an experimental drug. Leaving him for dead, the criminals disappear. Instead of killing him, however, the drug turns Shinichi into a little kid.
To preserve the illusion of his 'disappearance,' Shinichi adopts a new name based on his favorite author (Arthur Conan Doyle) and becomes Conan Edogawa. Ran, his (actually Shinichi's) childhood friend takes this little boy under her wing and brings him to her home.
Conan now lives at a detective agency run by Ran's father, but his mind is as keen as ever and he continues to solve mysteries... always allowing Ran's father to take all the credit.
As far as everyone's concerned, Conan is just a little kid anyway... even to Ran. This is *extremely* frustrating to Conan since nobody will listen to a 'little boy.' Despite this, Conan has a mission... to find the criminals who did this to him and get the antidote to that drug.

Note: Won the 46th Shogakukan Manga Award in the shōnen category in 2001.

Hinako, is one reincarnated from another world, she was called "the smallest giant" after she and the giant Eiris were united as sisters because they have the same goal; to find their family. Hinako searches for her sister, who could also have been reincarnated, and Eiris' siblings. However, in resolving a certain request, a gentleman from a church catches her eye, and is forced to take a risk.

A story about a young girl and a giant, two people of different race and birth, searching for their "loved ones", begins in this otherworldly fantasy of reincarnation that unites them.

Leon, a former Japanese worker, was reincarnated into an “otome game” world, and despaired at how it was a world where females hold dominance over males. It was as if men were just livestock that served as stepping stones for females in this world. The only exceptions were the game’s romantic targets, a group of handsome men led by the crown prince.

In these bizarre circumstances, Leon held one weapon: his knowledge from his previous world, where his brazen sister had forced him to complete this game. Leon, who really just wants to to live as a shut-in in the countryside, uses that knowledge to raise a ferocious revolt against the women and handsome men.

Realistic take on a modern doctor in another world treating fantasy creatures without magic or modern equipment

Alicia is an orphan living in Ciel, a world of swords and magic. One day, she discovers that she is "the heroine of an otome game." Even the death of her parents was simply part of the story.

Alicia decisively rejects the heroine's role as "nonsense." Taking the name "Aria" as an adventurer, she gradually grows into the "Ash-crowned Princess of Slaughter" who wields multiple weapons and magic!

But, when she receives a request to escort a "villainess," without realizing it she finds herself caught up in the stage of the game where nobles struggle against each other...?

"I am 'me.' I'm not a character in a game!"

A Level 1 adventurer, leveling up at an explosive rate with nonstandard skills and magic power? Kaede Suzumiya, a gamer, fell asleep while playing all night and when he woke up he found himself in another world, a fantasy world where using magic is possible! Using his knowledge of games, skills, and cheats acquired in this new world he decides to enjoy as much of his new life through magic and sword! This is an adventure tale from the Shinkou Shotou (Progressive Islands), the same company that brought you "Shikkaku Mon no Saikyou Kenja," "Tensei Kenja no Isekai Life," and "Isekai Kenja no Tensei Musou"!

A spin-off series about the life of popular character Roxy from the popular series "Mushoku Tensei".

Having discovered that she has been born without her race's racial ability, Roxy went through a childhood of isolation, but her chance meeting with a magician broadened her horizons. What awaited the young girl that, looking for freedom, left her hometown was...!

The Abyss represent pure annihilation. They possess unmatched power and follow their nature to consume all living things. Yet, one day, a traitor emerged. A clueless young girl, Hildegard, awoke on the battlefield and realized she’s the abominable “White Night” Abyss. After breaking through countless pursuits, she was adopted and reformed by Arya’s family. She gradually strengthens her own belief and uses the body of the Abyss to save humanity. To protect the goodness and warmth in her heart. But the chaotic Abyss won’t bend to her will...

Through posting a "Best Comment", I somehow became the main character of a webtoon!

In 1990 (previously 1986, but Kurumada moved dates), in Elysion; the five Bronze Saints Seiya, Hyōga, Shun, Shiryū and Ikki, having wreaked havoc in the Underworld's army and succeeding in resurrecting the God Cloths, engage the god Hades in a final duel to the death.

During the battle, Hades remembers that he has seen Seiya's face before and comes to the conclusion that he faced him before. He thus starts reminiscing about his previous host body, and the story starts 247 years prior, in the 18th century.

The protagonist, the Pegasus Saint of this era, is an orphan who is best friends with a boy named Alone, the host of Hades. Former Bronze Saints Dohko and Sion, two prominent characters in Kurumada's original manga as the sole survivors of the holy war of that century, have just been promoted to Gold Saints and eventually the two duos meet.

I died while I was reading hate comments on my novel.

I was already in shock over my death, but some 'Grim Reaper' appeared and told me that being a bad writer was a sin. To atone and make it into heaven, I was told I needed to survive past the ending in one of my novels.

And so, I entered the novel 'The Demon King is Dead'...

"Damn it all!! Why did this have to happen to me?!"

By all misfortune, the character I possesed was the Demon Prince, a character with no combat abilities—who dies at the very start of the story!!

A story of a young man who lacks a sense of reality after being dumped by his lover. He was visiting a seminar on cultural anthropology with his fellow classmates when he discoveres an ancient wall painting, which transports him to the past where mammoths dominated the world.Action

Please read the title again. <-- How often do I need to write it, so that you understand... I can't read!

In another world where the Royal family power is on decline, and turmoil are lasting.

In a remote village, a young child, who will later be named Ars, is "gardening" and "improving the land." Having the memories of his previous life, he who was fond of "city building" games, initiated to do "selective breeding for crops" and "house constructions" with his own magic to get out of poverty, and finally acquired a "brick creation!" Selling his bricks to a peddler, he obtains a rare egg of a “tamed beast," but can he raise it safely?

Later called as a “Living God,” this is the beginning of the heroic tale of a young boy who founded a nation!

Web Novel(: https://ncode.syosetu.com/n4546fc/ (Japanese)

I don’t want to work. Like at all. But I don’t have a choice. On earth where Humans, Elves, Orcs, Trolls, Dragons, and Alien immigrants live, it is an endless repetition of incidents. This is the story of a man that’s had to work in secrecy for 800 years because he’ll die if he doesn’t work.

Set in a fantasy world of swords and magic, the story centers on the titular Lycanthrope Adventure Insurance company. This company provides insurance and support to adventurers taking on the risk of going on a journey and finding a path through the darkness.

A karate practitioner who has been transferred to another world refuses the cheat skills given by the goddess, and he pursues his own karate in another world.

From MangaHelpers:

Utilizing a system called "Sense," each player aims to create their unique character in the VRMMORPG "Only Sense Online." Joining this realm is Yun, an absolute beginner in the world of gaming, equipped with some of the worst customized "Sense" ever. While his two sisters, both veterans in this world, criticize his choices of equipment, he continues to delve into the skill sets he has acquired. Along his way, he meets the art of "production" and people that have mastered this art. Watch as a total novice creates a revolution in the gaming world and create the "ultimate" support class. [DrCoke]

Yeon Hojeong, the first to unite the dark factions as the leader of the Unorthodox Faction, collaborates with the Orthodox Faction to overcome the chaos of the Three Cults. However, he meets an untimely end, entangled in the schemes of the Murim Alliance Leader.

"This really is my home!"

When he opens his eyes, he finds himself in the prestigious and once-destroyed Yeon Clan, a place he never forgot.

"I won’t make a mistake this time. Never again."

Determined to prevent the fall of his family and the future upheaval caused by the Three Cults, he embarks on a relentless journey! This is the struggle of Yeon Hojeong, the eldest son, to unite the martial world.