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.

A man who lost his family and fell into the depths of despair meets his end—only to be reborn in another world of swords and magic as Aldo, the heir of a noble family. He begins a new life alongside his twin brother Elphas and his loving parents. However, haunted by the fear of losing those he loves once again, Aldo starts to shut his heart off from his family. But when the roar of a ferocious magical beast threatens to devour them, the boy rises to his feet— determined this time to protect what he once lost in his previous life. A story of redemption and a second chance at heroism begins!

From Shoujo Sense:

Pinch server Shimodaira Kanna enters high school with the hopes of appearing regularly in volleyball matches even though he sucks at everything aside from serving. The club he enters has three other formidable first years. But that's not all, even the older members look like a strong team. Will he get his chance to shine?

Despite being from a prestigious noble family, Bridget, a failed daughter who made a contract with the weakest spirit, one day had her engagement broken off by the third prince, Joseph.

However, no one sympathized with her, who was acting as a proud daughter at the behest of Joseph... At that time, Bridget meets the Duke's son Yuri, who is feared by those around him because of his overwhelming ability and cold personality.

Two people who hate each other and repel each other. However, the encounter gradually changes their destinies. This is the story of a villainess who is despised for being incompetent and a villain who is shunned for being a genius who eventually fall in love.

Web Novel: https://ncode.syosetu.com/n9923hb/

4-koma about the daily lives of Tooru who has just entered the same high school as her best and childhood friend Run-chan, who is now a second year, and her friends Yuuko-chan (whom Tooru bullies cause they meet under bad circumtances) & Nagi-chan (who watches).

Included is a side story called Days in Junior High School in volume four which tells how Run and Tooru met and their adventures in high school.

A serialization of the story of a mute transfer girl who uses a sketchbook to talk to people, and a bullish classmate with a special ability who befriends her.

The enormous cave system, known as the Abyss, is the last unexplored place in the world. Nobody knows how deep down goes this titanic pit, inhabited by strange and wondrous creatures and full of mysterious ancient relics which purpose in unknown to modern man. Generations of bold adventurers have been drawn by the cryptic depths of the Abyss. In course of time those brave enough to explore the dangerous pit came to be known as "Cave Raiders."

In Oosu, the town at the edge of the Abyss, there lives a little orphan named Rico, who dreams of becoming as great a cave raider as her mother was and solving the great mystery of the pit. One day exploring the murky depths she stumbles upon a little boy, who turns out to be a robot...

A salaryman gets a catgirl visitor from another world, and bullies her with his culinary skills.

Uichiro, a junior high school boy, harbors a secret he cannot share with his childhood friend, Tama-chan. He has been cross-dressing for her because she has a phobia of men. This is a thrilling yet agonizing comedy about a boy who cross-dresses for the girl he loves!

Tamashiro Neko is a young witch in training, sent off by her parents to finish her studies. In her search for a place to stay, she arrives in a quiet town in the countryside, but then her first trial begins.

Masaichi Mazono, an otaku boy, and Toiro Kurumi, the most beautiful girl in school, are childhood friends.
Toiro, who was always in Masaichi’s room, was supposed to be like family to him.
But one day, Toiro, who was constantly getting annoyed by her romantic troubles, asks Masaichi to play the role of her boyfriend.
They thought it would be simple to pretend to be a couple because they’d been together for so long, but their ideal childhood friend can’t possibly end up as a false lover…
“E-eh no, holding hands is embarrassing.”
A childhood friend who is more than a lover embarks on a more adventurous lover’s life than she could have dreamed!

High school girl Sayama Umi is placed in the care of the neighboring Hiroi family while her mother is away on a long business trip. The Hiroi household is home to Shoya, an eight-years-older figure she admires, and Umi's heart races at their long-awaited reunion. But the Shoya she encounters is completely different from the one in her memories...

A faintly sparkling cohabitation story about meeting changed memories once more.

That gloomy girl is so beautiful! Let's aim for it! A school romance comedy together with that reserved, cute girl as we try to stop being loners!

From MangaHelpers :
High school student Misumi Makoto is called into a fantasy world by the god Tsukuyomi, in order to be a hero. However, powerful others in this world aren't as thrilled to have him there, and they kick him to the edge of the world just as Tsukuyomi declares that he must leave Makoto to find his own way. Now it's up to Makoto to find his own way.

Da-in, ended up possessing the villain of a story.

To make Stardust — the story's protagonist and his favorite character in a dystopian manga — happy, he resolves to become the villain Egoistic for her growth.

Da-in deliberately causes terror to enhance Stardust's abilities and preemptively prevents all the tragic events from the original story, but in the process, he gains public support while also drawing Stardust's suspicion.

Stardust, who initially opposed him, gradually opens her heart, and soon even begins to show signs of obsession towards him...?

...You did read the title, right?

It's the present day. A small boy, abandoned at a shrine by his mother, is taken in and lovingly raised by a serpent god who has adored raising children since ancient times. However, being a non-human deity, the serpent god’s affection seems to be just a little... off the mark?

The popular AV actress Miyama Yuri has suddenly announced her retirement. At the same time, Shikishima, a convenience store manager and her biggest fan, finds himself at a loss, unsure of how to move forward without her in the industry. Amidst this, a girl named Tamagawa-san shows up, applying for a job at Shikishima's store. Coincidentally, she bears a striking resemblance to Miyama Yuri. This uncanny similarity leaves Shikishima torn. Should he ask Tamagawa-san if she's ever appeared in AVs? But in today's politically sensitive climate, such a question feels risky... Who is Tamagawa-san really?

From MyPersonal-scan-: A remake and reimagining of the original series by Hara Tetsuo (Hokuto no Ken, Hana no Keiji) which ran from 1988-1989, with new art by Yoshihara Motoki. Cyber Blue: The Lost Children follows the story of Blue, a descendant of colonists from Terra who settled the distant world of Tinos in the 22nd Century. The brutal environment of Tinos forces humanity to rely on an artificial life support system implanted in the chest called the Biomatrix, in order to survive. In the 25th Century, Tinos is ruled by a Planetary Government bent on eradicating The Lost, dissidents who refuse to submit to its autocratic rule and are hunted down by its military for extermination. Through total control of Biomatrix production and issuing them to only those who submit to its authority, the Planetary Government enforces its will in an effort to finish off the Lost and their descendants, the Lost Children once and for all. Set in the dystopia of Junk City, Blue encounters Fats, a powerful robotic Artificial Intelligence, and the story of their meeting will change both man and machine, the fate of the Lost Children, and the course of human evolution forever.

A certain girl genius with more power than knowledge accidentally summoned dozens of students and teachers into a dangerous world filled with beasts and magic, but the protagonist isn't a student or the homeroom teacher... it's the janitor.

At the time of their summoning, the students and teachers each gained a power formed from their soul, but not the janitor. As the janitor was about to be bestowed with a power that would protect him, his power was forcibly taken from him by an arrogant student. Having gone three years without a contract extension, he failed to get a job after having graduated from a third-rate university. Somehow he is still a contractor at 25 years old and was a janitor for 2 years, with a take-home monthly salary of less than ¥120,000. From a society that rejected him, he was thrust into a world that rejected him. And what janitor-san wished from the Goddess who took pity on him was...