“Listen up, right now, there's a super important and urgent question! ...Am I cute?”

Chiba and Sheina, a pair of single, otaku males in their 30s that met during a highschool reunion!
Shortly after hitting it off with each other, they're thrown into one misfortune after another, and before they know it... They got reincarnated in an Isekai as pretty babes!

From Yen Press:
After being soundly thrashed by the hero Emilia, the Devil King and his general beat a hasty retreat to a parallel universe…only to land plop in the middle of bustling, modern-day Tokyo! Lacking the magic necessary to return home, the two are forced to assume human identities and live average human lives until they can find a better solution. And to make ends meet, Satan finds gainful employment at a nearby fast food joint! With his devilish mind set on working his way up the management food chain, what will become of his thirst for conquest?

The beautiful lady, Louise, has memories from her past lives. And there are 7 peoples' worth of lives (moreover the villain's role). Louise, who has always met the bad end of getting stabbed to death, has decided that she will live this life peacefully. However, Louise has been assigned as Prince Emile's instructor! And so, she struggles with teaching the extremely shy prince who shuts himself up in his room. In her 8th reincarnated life, she will do anything for a happy ending!

Exploring the mysteries of the reincarnations and the secrets behind her previous deaths, this is a high tension comedy with the reincarnated lady and unique characters!

Stories following various adolescent girls and their encounters with puberty and other worlds.

Final Fantasy: Lost Stranger was released as part of the Final Fantasy franchise's 30th anniversary project. The manga follows a Square Enix's employee who dies, and is reincarnated into the world of Final Fantasy.

Huang Bei Yue is an assassin that gets transported to another world thanks to a mysterious jade, boundless beast!
Now she resides in the body of a 12 year old, who happens to be the king's sister, who is constantly bullied!
"Now how shall i take my revenge?"
Original Webcomic (Chinese)

Yukino Amaishi signed a contract with God to save her sister. She was then reborn in a different world as Lefina Eilferia, the daughter of a duke and the Crown Prince's fiancée. After successfully completing the objective of giving the heroine and the prince a happy end, Lefina, who played the role of the villainess, ends up working in the castle as a maid.

A little girl gets sent to another world where she does her best.

Web Novel: https://ncode.syosetu.com/n8991ct/
Light Novel: Bookwalker

One day, Yadoya Kenta, who was working for a black company, dies of exhaustion. When he wakes up, he finds that he has been reincarnated not as a hero in another world, but as Tohri, the son of an innkeeper in a rural town! This time, he wants to work moderately and relax! Surrounded by a kind family and lively customers, the slow life of an innkeeper's son begins!

High school student Sena Shirai is just about to leave behind her shut-in lifestyle and join the outside world, when she becomes the victim of a traffic accident. When she opens her eyes, she's somehow been reborn into a fantasy world! However, everyone around her fears her as a witch, so she reverts to her former habits and lives a lonely life in the woods, until one day when... a young man comes to see the witch?!

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.

When playing a virtual reality game called Cang Lan, Xiao Wan gets pushed off a cliff. She ends up in another game world. What will happen to Xiao Wan?

With tensions between the neighboring country rising signaling the presence of a war soon to begin, Soalla, the princess of a small country, worried whether her own country would be able to defend itself with its weak national power. The king was bedridden and the retainers who were her last rays of hope had nothing but the antiquated motto of battle honor in mind. Not one person had a concrete proposal to protect the country, leaving Soalla to wonder if this was where Favell would fall... However, it was then that Naoki appeared before her. A "magician," that left his name in history who possessed the power she desired to save the country.

Office Lady falls from a building is reincarnated into another world and ends up at the Devil Kings castle. Can she save him from the bad ending?

In the year 672 of New Era, the much-revered stylist and sovereign King Sayet passed away, leaving three great outfits known as his “legacies” behind.

So great were his treasures that it divided the nations and plunged them towards a bloody future plagued with war. The nations desperate to avoid war, not wanting to ravage their lands, managed to agree to settle the matter using a styling contests for ownership of Sayet's treasures.

This styling contest was far more intense than anyone could have imagined, having lasted as long as 9 days, and being remembered in history as the “Nine-Day War”.

Eight years later, the war is over and peace has been established between the nations. However, things are not what they seem, and the wind of war has started to blow again.

Nikki, a normal girl from earth is summoned to this new world of stylist know as Miraland, as she may be Miralands' last hope to shift the course of the land's fate.

The comedy spin-off story focuses on the Spear Hero, Motoyasu Kitamura. At the brink of death he acquires the power to turn back time, and decides that he'll use it to become stronger and start a "new game."

"To pass time before surgery, Hwayoon read a romantic novel for some steamy scenes.

Little did she know this would lead to her reincarnating into the story as an insignificant maid that's executed soon after. The goal is to survive, but things get out of hand... and steamy.

Souhei embarks on a trip in the gigantic labyrinth that suddenly appears in his basement. But it's an extremely special dungeon where the only way to become stronger is to do lewd things with girls and increase Lv (Love)! The story of a young boy who explores and does lewd things with women!

One day home from work, the exhausted salaryman Amano's bathtime is interrupted by an elf suddenly emerging from the tub! This clumsy but kind of brilliant (direct quote) otherwordly elf comes to the human world to take it easy and enjoy reading some manga.

In the year 20XX, Japan began exchanging ideas and cultures with other worlds. One day, a beautiful elf moves into the apartment next to Keita Inudo, a high school boy who aspires to be a Mangaka. But she won't be the only girl to push herself into Keita's daily life! Will he be able to cope with all these sudden appearances while keeping his home, his career aspirations, and his sanity intact?