Once, a hero has been summoned to a different world in order to defeat the demon king. After the war stretching 3 years ended, the commendable hero slayed the demon king. And he was forcibly deported back to earth after being dismissed.

"Give me a break!
Elves in addition to beast race, dwarfs and demon race.
Even though I wanted to make a harem in the different world I saved!
My dream will not come true on earth, where there is no magic at all."

Thus, the hero returns on his own.
Without the blunder of being extradited to earth this time, he will build a harem of his own in a different world.

Cayena, the Imperial Princess, was known as the most beautiful woman in the Empire. She was a woman who knew nothing but evil and luxury.
However, she was destined for ruin: she would be used as a chess piece by her younger brother to secure his throne and killed by her crazy husband.

“I’ll make you the Emperor.”
“… Sister, you're going to make me the emperor?”
“In exchange, give me freedom.”

She had to change things before she became that Cayena.

A duke's daughter and the crown prince's fiancée... I, Rachel Sheringham, was both and wielded dark attribute magic, which allowed me to use necromancy. I was accused of colluding with demons due to it and was executed.

With regret as my source of power, I will return to life as a lich!!!

In the fantasy story, the demon king Leonis sealed himself away for 1,000 years in order to prepare for the final battle, but when he woke up, he found himself in the body of a 10-year-old boy. A beautiful young woman named Lisellia from the Holy Sword Academy then says to him, "Why were you locked up in such a place? It's OK now, this big sister will take care of you!" Under Lisellia's care, Leonis is shocked to see that the world has completely changed. Bewildered and confused, Leonis finds himself enrolling at the Holy Sword Academy.

Web Novel Spoilers warning: The story takes place on Earth after end of the Web Novel. Rimuru plants a parallel existance inside Satoru Mikami, to live his life with Ciel and finish his missions he was unable to when he first died.

Kaoru Mochimizu, a 30-year-old female research scientist who studied the three-dimensional structure of everything. However, one day, she died in an earthquake and met a goddess. Having covered for her kouhai during the earthquake, she was allowed to reincarnate in another world with two skils.
Kaoru Mochimizu is now Charlotte Elbaran, the eldest daughter of a Duke in the Kingdom of Elida, on Planet Garland.
With memories of her past life, and taking advantage of the skills "Structural Analysis" and "Structural Editing", she will live a good life.

I'm Airi, an office worker who reincarnated as an otome game's villainess, Irene. I was on cloud nine ready to start my second life when I was expelled from the academy. With the help from the townspeople, I opened a quaint café. I was supposed to enjoy my new, peaceful life when suddenly "a fluffy creature" appeared! I tried to feed him my signature sweets, but...?!

By the power of the goddess, I was reincarnated in the world of VRMMORPG "Valkyria Chronicle".
Apparently, in the real world, he died from overwork due to his life as a company slave.
I don't have the original body ... If so, I will live faithfully to my desires, create a dungeon with the female character I like, and have a carefree (innocent) sex life ... I will live a good life!

(I hope the former description wasn't from the translator for this series, because you know it was 100% Rewritten.)

In the first life she was a terrible queen, who brought trouble to her country, and eventually, her own king burned her at the stake. In the second life, she became a talented surgeon, redeeming herself for her past, saving people. But because of a plane crash, the talented surgeon Song Zhi Hyun returns to her former life! This time, she decides to change everything, becoming a doctor.

A spin-off of the series “Tondemo Skill de Isekai Hourou Meshi” told from Sui's perspective.

I’ve transmigrated into the body of a princess, living on borrowed time.

It’s okay, though, we can cure this illness!
My goal is to lead a life where I can do whatever I want!

First, I decided to rave over all of my favorite characters in the novel!
But, because I am a villainess, people around me tend to be wary…

“You will die soon, and yet… how can you laugh like that?”

Well, it’s ‘cus I’m super hot.

The great sorcerer Delray Curtis was reverse reincarnated from his magical world to modern Japan as a creepy otaku.

Sakimori Kagami plays a VRMMORPG called Arch Earth Online. He is a veteran player with the name and appearance similar to an elderly bearded wizard from a certain book about a ring. One day he purchases an appearance change item as a last resort to spend expiring currency and gets the idea of choosing what he would want to look like if his character was ever a girl. Falling asleep should have suspended the game, but Kagami wakes up still online and feels the game has has gotten a bit more realistic. Did Arch Earth Online finally get a long-awaited update?

And Now He Trains Beautiful Warriors Using Superpowers!?

I, who should have died after being hit by a car, was born again in another world.

However, I was born in a shady minor family that used magic and controlled wooden puppets called the Marren Clan.

Possessing a strong interest in magic since my previous life, I spend my time zealously studying magic to the point where even the people in the vicinity draw back.

One day, I heard I was to be married to my little sister when I turned 16 in accordance with the traditions of the Marren Clan and decided to flee to the city.

For now, since I have the strongest magic, I guess I should idle around making only enough money so that I don’t have to work for my whole life.

"I did it again...!"

The Hero who can't seem to set out on his journey!!

The protagonist, who was reincarnated into another world, becomes a hero and receives the task of defeating the Demon King. To repay the world that accepted him , he decides to set out on a journey... However, he can't seem to leave the first village, as he is constantly tempted by charming heroines such as the female priestess, his childhood friend who is a magician, and so on!

Thus, the birth of the "I did it again...!" type hero!

Late at night in the middle of my part time job at a convenience store, I had an encounter with a robber and was mercilessly stabbed to death.

As I was about to lose my consciousness, I thought about how much I wanted to do this and that when I heard a voice……

『The wish to be summoned has been confirmed. Granting Unique Skill 《Jack of all Trades, Master of None》』

Rude words such as that were said. Jack of All Trades, Master of None? Don’t screw with me!

Such thoughts and wishes were for naught as my consciousness faded, when I came too I was standing on a green foggy hill.

(no overpowered protagonist and no harem)
[Description from novelupdates.com]

There’s a legendary Bishoujo Game that has become popular among Japanese gentlemen.

Its name is “ Magical★Explorer” or Magiero for short.

The game’s protagonist has a cheat-like power with12 different beautiful heroines to flirt with, including additional 12 heroines from the DLC, a harem of 24 beauties. I have become that protagonist!………………Not. Instead, I have become the third-wheel character who always laughing like an idiot next to him.

Of course I was in despair at first.

Of course. If I am the protagonist I could have all 24 heroines for myself along with unparalleled cheat power. However, since I am the third-wheel there’s no heroine that would lay their eyes on me.

But now I couldn’t care less about the protagonist and his heroines. Why? Because I discovered magic. While I was using it, I have become interested in it. I want to master it. I want to become the strongest. Thus I have decided.

I would abandon half my role as a protagonist’s friend to train my magic and then I would beat the hell out of that cheat who can solo the Demon King.

Depicting the story of a shut-in, Kirihara Yukito, after being reincarnated into another world.
His peaceful life with his precious caring sister, Sana, suddenly come to an end when a beast appeared and attack them, thus reincarnating him into the “Ever World”. Moreover, knowing that Sana also got reincarnated into the Ever World, for the sake of finding his beloved little sister he begins his journey in another world…

"I" had the luck of being the one who reached out towards the young lady whose engagement was annulled by Prince Alephaldo, Elana. The day after the annulment, I was banished with her and married even though we dated for exactly 0 days. Well, it's just a slow country lifestyle of banishment in the neighboring country! Or so I thought, but...? This is my story about becoming a banished daughter's husband.
Manga artist's twitter: https://twitter.com/NtsmKimama
LN artist's twitter: https://twitter.com/yukixkana