Ash is a young boy with apparent past-life memories who lives in a remote, deserted village. As he remembers leading a bountiful life, he can’t bear living in a world akin to the Dark Ages, where not even the internal combustion engine exists. Ash envisions the rebirth of a civilization where housing with proper sanitation is the norm and the world is connected via a means of transportation faster than horses. For that reason, he is eager to consult books containing knowledge from a highly-developed ancient culture that is rumored to have existed far in the past. Ash makes use of the church’s resources, learning how to read and obtaining the knowledge that he seeks. In addition, he enlists the help of the people around him, including Maika, the village chief’s daughter. Together, they aim to develop their own village. This is only the beginning of the story about a young boy who sets out to revolutionize the world in order to rebuild civilization and create his ideal life!

Kowata Makoto is an airhead with a bad sense of direction who just moved into her relative's house, but is that all? A manga about the coming of age of a witch in modern day Japan.?

Average high school student Mikagami​ Kouji is a hardcore gamer. One day he gets isekai'd and he only gets the skill "copy" which is apparently useless but we all know it's secretly OP or something. He's enslaved to be a gladiator by his summoner, the big booba, head priestess Zayd. He has to fight in the Colosseum and if he loses he gets raped.

"Kouji-kun, I want to see you have sex with another girl."

Even though this will drive my mind and body further into a corner, I just can't hold back my feelings of wanting her to love me...

(Source: Ganma)

Who says revenge is vain? It's so fun!

In a world where magic is extremely advanced and boasts a civilization that is no different from science fiction, he has reincarnated into the noble 'Rondel' family.

However, born as the child of a commoner concubine, his life is threatened by the first wife and half-brother. He acquired the role of 'Manuel Lucas', the great mage who changed the world. And a refreshing revenge story begins!

'From now on, I'm going to live the life I wanted'

Okinawa. An ordinary senior high school student, Kio, meets an alien girl who has cat ears and a tail who came to Earth so that she could learn more about it. In the end, he decides to bring her home. However, living with such a person might not be as easy as it seems for Kio!

Takina Inoue, a high school girl working as a member of an all-female taskforce of assassins and spies known as "Lycoris" dispatched to eliminate criminals and terrorists in Tokyo, is sanctioned by her superiors at the DA agency for disobeying orders in order to save a colleague. She is transferred to work with the elite Lycoris agent Chisato Nishikigi at one of the agency's branches, which operates under the cover of a cafe, called "LycoReco".

Youth romcom about 4 sisters who are all experiencing their first love at the same time. While the eldest is having a crush on the guy at her part-time work, the other three are dealing with their first romantic experiences with boys in their classes and school clubs. Every night, the four have heart-to-heart girls talks as they navigate their respective first loves.

One day, Sylva realized that he reincarnated into a mob soldier from the game that he was hooked on in his previous life. Even though he utilizes his game knowledge to do his utmost best to survive in this dangerous world, he opts to hide his true strength in order not to throw the scenario into disarray. However, an unexpected turn of events led him to easily defeat a powerful demon that even the hero is hard-pressed to defeat. And to make matters worse, he did that in front of his favorite heroine in the game... Upon this incident, word started getting out about his true strength...!

Atobe Arihito is an intense workaholic thanks to his slave-driving boss, the beautiful Igarashi Kyouka. En route to an office vacation though, their bus gets into an accident, killing Arihito instantly.

His soul is transported to the fantasy world of “Labyrinth Country,” where he’s reincarnated as a “dungeon seeker”! Trying to join a guild and pick a job, he’s surprised to run into Kyouka, who also died and has chosen the job of “Valkyrie”! However, he rejects joining her party and decides to become the rare support role of “Rearguard”! But will he be able to find a party in time?

Kuzukake Shoutarou is a high school boy whose only family went missing while traveling. The ones who came to his rescue? The strongest stepmothers ever!? Housework and daily life taken care of down to the last detail!!

Standing at the crossroads of life; the important choices - “Flags”. Hatate Souta, a young man who can see these flags, transferred to “Hatagaya Academy”, a prestigious school in the metropolitan area. Not only does he meet beautiful girls in his busy school life, he even goes as far as living with them under the same roof! Surrounded by these flags, this enviable romantic comedy begins!

In a forgotten corner of a massive castle, a starving child teeters on the edge of and death…until she suddenly awakens with the memories of Chihiro Sagami, an office worker from modern Japan?! Determined to survive at all costs, she stumbles upon a kindhearted chef and strikes a deal: food in exchange for work. Though small in stature, her nimble hands and capable skills quickly earn her the fond nickname “Little Helper” among the castle staff. But behind her infectious eagerness and penchant for delicious food, her mysterious golden eyes hold a great secret that could determine the fate of the world!

Meet Tsubaki Kuchinashi, the Manhater Prince. Beautiful and popular, Tsubaki's core strength in high school comes from her position as the principal's granddaughter - suffice it to say, but any student or teacher who even looks at her the wrong way could be expelled at a moment's notice.

Meet Tadashi Kiritsu, the head of the Public Morals Committee. As sharp and rigid as his glasses, Tadashi despises Kuchinashi's iron grip on the school. Naturally, a challenge to her rule bothers Kuchinashi, and she decides to get rid of him as soon as possible. Her plan? Get him in a honey trap. However, that's easier said than done.

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!

One year after the war against King Glenn, a rebel army known as the Knights of the Fallen King has unleashed havoc throughout Szaalenden, seeking to revive Glenn! Is the war set to begin anew?

From LHtranslation :

In a certain world, there was someone who excelled in magic combat, people called him 『Sage』. Seeking the strongest combat art, he devoted himself to research every magic and combat arts in existence. And the conclusion he arrived at was very cruel, 『My body is not fit for magic combat』. Yet he didn’t give up. He sealed his own soul with a magic art, and was reborn in a far-off future. And the magic theory in the completely changed world he saw there was of unbelievably low level.

From Must Be Endless: A boy who is easily roped into things & a cool beauty who is a natural asshole.

"I'm terribly sorry!"

A god was suddenly prostrating in front of Kayano Takumi. He was apparently killed by mistake. Moreover, he can’t be reborn again. However, he is able to live in a different world? Then, let’s do that, please. The god made a mistake again and transferred me into a dangerous forest. Seriously, what’s going on? Besides, there are children here. I can’t leave them here, I will take care of them.

Lucas has a hard life. In his mid-thirties, a mixture of failures has left him old and crippled, playing pack mule to a couple of young adventures.

Then one day, he pulls a magic sword from a stone that tells him he has been chosen to become a hero. Given a youthful form, Lucas must use the power of the sword to vanquish evil and attain a massive harem.

Before you ask, it’s not isekai because he’s been in this world from day one. It is wish fulfillment, though, so in the end it’s basically the same thing.