Felmenia Stingray was a genius magician. She quickly became the most distinguished magician of the Astel Kingdom after her discovery of white fire magic, which had the power to burn anything.

However, the world is in peril due to the Demon King. The kingdom's court magicians perform a summoning ritual for heroes and bring forth a hero and two youths, a boy and a girl. Unlike the girl, the young man refused to fight the Demon King alongside the Hero and demanded to be sent back to his world. The kingdom, angry with his behavior, locked him away.

Now Felmenia stands before the same young man with her strongest magic, the white flame, being completely useless and asks who he is. It was already obvious to her that this man was far stronger than she was. To this he simply responds.

"Yakagi Suimei, a magician."

Six months after the fight to the death with The Bog, Kaiji escapes from the underground and pays off his debts. Sakazaki gets fed up with Kaiji and tries to get rid of him by giving him 3 million yen as compensation. At that time, Kaiji is reunited with Miyoshi and Maeda, who were his friends in the underground, and they come up with a plan to swindle a large sum of money from Muraoka, the president of the underground casino where they work. Kaiji takes 3 million yen from Sakazaki, promising to pay it back, and plays a variant of mahjong called "17 Steps" invented by Muraoka.

From Chocolate Kimchi Scans:

Star, a mysterious, naïve child, searches for Garion, an alleged miracle-maker who is said to live in a lone apple tree, so that he can keep his best friend Miru, a seasonal flower, from withering in the coming winter.

Once, there lived a fearless girl who could defeat even the strongest of beasts with her bare hands. She was the strongest person living. Thousands of years later, the same girl from the stone age has lived to learn what romance is. Will her strength scare everyone away, or will it let her fall in love?

A blessed Hero. A vicious Demon Lord. A common objective.
An epic battle between good and evil whose outcome will shape the new era the world will enter has reached its endgame...
However, things aren't what they appear to be and plans take an unexpected bend.

Pokemon Sword and Shield Manga Adaptation, featuring Gear Meister Soudo and Schildemilia.

Tenka is a chad virgin sigma male who will use his di-- I mean his holy sword to defeat all the succubi because nonconsensual sex is wrong, kids. He teams up with the Holy Maiden Amelia (with an A) who also uses less-than-traditional weapons.

The power I posses is the strongest in this world! The enemies I must defeat... are humans!?

I was Suddenly transported to another world. Being called the ‘Suitable One’, with the world’s strongest power “Holy Sword”. I thought I would be using that power to make a great impact in this new world. However, in this alternate world there are “inhumans”; Monsters that oppress the lands. Questioning my own convictions, I ask, is this correct? Who should I use this power for? This is the beginning of an Isekai battle fantasy!

A tribute anthology for Mushishi.

College student Otonari Otoya is a boy who lacks self-esteem and dreams of being reborn into a different dimension. One day while playing a [video] game, he accidentally clicks on an ad, and trips into another world?!?!
He's surprised but delighted, until he realizes that something's strange. A whole group of guys are treating him too kindly, almost like he's a girl! Could it be that the world Otonari was transported into... is an otome game?!?!

A sequel to the original Gamaran manga focusing on Gama's former rival, mentor and friend Sengoku Iori.

The protagonist is a mysterious and resourceful man who goes by the name "Zero." An expert on artworks, antiques and ancient artefacts, Zero is adept at rooting out their histories and uncovering any unusual qualities they possess. Because of this, he frequently gets called on to dispel "curses" and to both uncover and create forgeries.

Zero is a man who will stop at nothing to see a job done, but he will also charge whatever fee he deems appropriate: it might be a billion dollars, or it might just be one.

A veteran adventurer was preparing for his retirement when his former disciple returned to the village, intending to recruit the old man to his party. Filled with regret due to an incident that happened in his first party, the old man rejected his offer. Being affected by his disciple’s adventurous spirit, the old man leaves in hopes of reigniting his long-lost dream, to become the strongest adventurer that ever lived.

Ruu Brandel, a genius wizard with a talent for thousands of years. One day helped a beautiful aristocratic daughter, Franc and was to be assigned to “Magic Girls' Gakuen” where he acts as a teacher! Now, the “non-standard” teacher life by the strongest wizard opens!

(Source: MangaUpdates)

After dying in a mountain climbing accident, a 28-year-old man finds that he is reincarnated in an alternate world... AS A POLAR BEAR. After taking a PAWS to get acquainted with his new body, the MC soon learns that he can fight better than aKUMA from Street Fighter after he BEARs witness to a beast girl being hunted by the army and gets ARCTICked off. The question is: is this new life a blessing, or a cURSUS MARITIMUS?

Wazi, a pro-gamer but an average college student, is invited on a date by his fellow gamer. However, he is hit by a truck on his way.
I decided to change my life from today onwards… Is this how it will end…? No, I want to live the life of my dreams…

Where am I…? What is this place?
Welcome to Brave Mainland!
Am I turned into a Mushroom? How am I supposed to kill the demon king?!

The story of a coward mushroom on his adventures to become an overpowered warrior.

One day, my house got connected to a dungeon. It's dangerous outside because of the monsters, but in order to survive, I have to clear the dungeon within the time limit!

"I don't want to die. I want to survive."

Kim HyunBok has to try and clear the dungeon by himself now that all the other explorers have died. Having awakened his powers, he starts taming monsters. With the skeletons Chris, Kai, and Kessle who have regained their memories, our protagonist's life-risking adventure to clear the dungeon starts now!

The Demon King led his army of demons to wipe out the human race. The Hero, Kail, and his allies attacked the Demon King's castle to defeat the Demon King. The Demon King is slain, but at what cost? Kail lost all of his allies throughout the war. Friends, family, lovers, comrades. All dead, and he is dying.
As Kail's life ebbs away in the Demon King's chamber, he notices a strange gem that the Demon King had coveted and approaches this relic to grab it; after an intense light glows, he is sent years into the past. After recovering from the initial shock, now in his younger body, he decides to avoid making the same mistakes of his first time through these years and to become stronger.

Ling Chen lived as a villain for 35 years, but in the final battle with the hero Ye Muxue, he "initialized" reset-reborn back to 17! what? Do you think he wants to be human again? Less talk! Of course, it's time to kill Ye Mu, who wasn't super powered at that time!

Left behind again, and again, and again.

The straggler was abandoned by all of mankind due to a cloaking technique unknown even by God.

“Why was I the only one left behind? Why did this happen to me?”

[In the end, even after God had devised a list of all the humans meant to be transported to another world, he could not find you. You said it was a truly phenomenal cloaking technique, right?]

So I, alone since birth, began my lonesome daily life on Earth, awaiting humanity’s return.