Irene Perreira is a boy who sleeps to run away from reality. People mocked him, calling him a 'deadbeat', but he had no wish to change. Until one day, he dreamt of a swordsman… It was a dream about a talentless man who had been training by swinging his sword for decades.

From Viz:
The more Wedding Peach and her friends Yuri and Hinakiku discover about their new-found magical powers, the more Rain DeVilla and her evil henchmen vow to destroy them. In the never-ending battle between love and hate, three young girls are the world's last line of defense against the onslaught of evil.

Main story is in vols.1-6. Vol.7 is a recap volume.

An official spin-off of the the super famous fantasy "The Eminence in Shadow".
OP main character × isekai reincarnation × misunderstandings!? This is the beginning of a spin-off of the super-famous web novel isekai fantasy "The eminence in Shadow".
Cid is a boy who reincarnated in another world, and decided to enjoy a scenario of being "the eminence in shadow, someone who meddles with the story from the shadows, and exhibits his true power in secrecy". Thus unfolds the story of him and the secret organization he leads—shadow garden—as well their their pleasant friends! An easy-going 4-koma manga starts right here and now!

I found myself possessed in a game I used to play occasionally.
And to top it off, I'm the female warrior of a barbarian tribe that only has bad endings.

...Alright, let's escape.

On a day just like any other, a giant spaceship suddenly appeared and invaded Earth, obliterating entire cities in the blink of an eye. In the midst of the attacks, Kanna Fujimiya, amateur content creator, rose to fame overnight with her video coverage of the invasion. With her newfound popularity and charms, Kanna continues to cover the war from the front lines, but...!?

This amateur content creator reveals the truth behind the interstellar war in this science fiction thriller!

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]

The first life. After a tragic accident losing his family and legs, he ends his own life. The second life. He earned fame as the Red Demonic Master in Zhongyuan, but was betrayed by the man he trusted the most. And now comes his third life. In his life back in the modern world, Gang Jinho decides to live a normal life... However, he was too used to the Zhongyuan life to become a normal person! 'I wanted to live peacefully. But you are the ones who started it. I hope you're prepared for this.' In front of the threats of his new life, can Gang Jinho shake off his impulses as the Red Demonic Master and obtain the 'normal life' he desires? The adaptation story of a legendary martial artist in the 21st century!

From Mobots: During the closing years of the civil war period and uneasy reign of Toyotomi Hideyoshi, when men high and low scramble to follow conventional propriety so that they don't attract undue notice (or death) to themselves, there is one very bizarre individual who is known for his legendarily outlandish and wild personality, physical appearance and behavior. This series traces the dramatic adventures of Keiji Maeda from personal conflicts with his adopted Maeda family, brave combat exploits, travels to the capital, and relationships with famous existing figures such as Iyeyasu Tokugawa, Rikyuu the tea master, and Hideyoshi himself, to experiences with the foreign and Japanese Christian faithful.

A deformed female human go out with a pumpkin on her head to kill all who bullied her in the past.

Dragon Ball Super will follow the aftermath of Goku's fierce battle with Majin Buu, as he attempts to maintain earth's fragile peace.

Senya is just an ordinary guy, who wanted to become an astronaut as a kid. One day and suddenly, he's transported into another world after seeing on the rooftop of his school something like a "tower" going across the sky. There, he witnesses a ruined world, where skyscrapers are connected by suspension bridges. Senya, perplexed, manages to see a girl standing on the roof of another building, as well as a masked man holding a bloody weapon in his hands...

A scholar who failed the national exams is picked up by a martial arts master and given the task to record his life into a book. Through their journey, Son Bin meets many great people and soon finds himself following the same path as the master, as the Martial Arts King.

The setting is a church in Japan. The main character is Rui, the strongest former hitman. It's a violence and comedy about a group of hitmen protected by the church!

From Udon Entertainment:
When Mara Shin’s dog Toto gets lost one fateful day, she follows his trail along some yellow brick road and ends up in the wonderful land of Oz! Everyone instantly starts calling her Dorothy, but these aren’t the cowardly lion, brainless scarecrow and heartless tin man adventures you remember. This fantastic fairy tale features familiar characters…but with a definite action/animated twist!

A classic redone for new fans. Met Mara Shin a ordinary student whose life was normal until one day she chase after her dog Toto. That when she saw the yellow brick leading her to Oz. There thing are not the same Oz that we know. Colons, Robots, and Chimeras oh my. So join Mara (Dorothy), Abbe (Scarecrow), Namu (Tin Woodsman), and Tail (Cowardly Lion) down this twist adventurer down the yellow brick road.

Everyday is a normal day in the small town where Kasuga Arata lives. However, everything changed on the day of the Black Sun, and following it, a magician appears before him. The Black Sun caused the Breakdown Phenomenon which destroyed the town where he lives. Because of this, his normal life was artificially reconstructed by a Grimoire that his childhood friend had left. Just what is the purpose of the magician coming to the town? What will he do with the Grimoire's keepsake?

From MangaHelpers:
The story begins in 1420, right as what would be known as the Bohemian War began. A young girl named Sharka is raped and left for dead among the corpses of her whole town, but she manages to survive. She is picked up by the Bohemian forces, who put a gun in her hands and take her on board as a soldier. Will Sharka be able to fight and take her vengeance?

He is a successful writer who has created a fantasy world in his novel. But he made a terrible mistake in the end, causing the protagonist to reveal himself as a traitor and the world to be dominated by the demon king. He received the wrath of readers and regretted his choice.

Then he woke up in his own novel, in the body of the villain Shin Kang Ho, a ruthless killer who works for the demon king. He is five years before the disastrous ending, and has the chance to change the fate of the world. But Kang Ho has no intention of being a hero. He knows the world is cruel and full of greed. So he decide to use his talent and knowledge to achieve everything you can, without caring about others.

Kang Ho will devour all the resources, rewards, skills and treasures he finds on his way. He will become the strongest and richest of all.

When a stray black cat named Kuro crosses Mahiru Shirota’s path, the high school freshman’s life will never be the same again. Kuro is, in fact, no ordinary feline, but a servamp: a servant vampire. While Mahiru’s personal philosophy is one of non-intervention, he soon becomes embroiled in an ancient, altogether surreal conflict between vampires and humans.

Have you ever noticed that someone you knew is no longer themselves? The subtle changes they show that indicate that they are no longer…human? Join hunter Ha-Te and the part-timer hunter Ji-Hyun on their adventure of hunting trolls to save the humanity!

Mai Shintani, who works at the Kitakabane Police Station was suddenly assigned in the "Organized Crime
Countermeasures Division", commonly known as the "Sotai". Immediately after that, she gained influence within
her jurisdiction. The leader of expanding yakuza faction "Tatsygamigumi" Shogo Mikuro mysteriously disappeared.
There's a tension in the conflict between cases of opposing Yakuza groups. And for some reason, Shintani is looking
composed at the northern police station. Behind it is an absurd shocking truth?!