Taken from Deja-vu:
In a world where djinn rule and humans are enslaved, Toto and Loukir break the seals of the century-old prison of the "gentle genie," Rampou, in order to try and save their country...

From CMX:

In the late-medieval land of Barnard, between the mountains and sea, the peaceful lifestyle of the people has been shattered by fear. Monsters known as the Dark Ones roam the land, killing indiscriminately. The townsfolk fear to venture out from their homes, and travel from town to town has become a risk to life and limb. To protect the people from this terror, several guilds have sprung up, including the Guild of Assassins and the Guild of Mercenaries. To go out into the world, or travel across the wilderness, hired mercenaries are essential.

One man has built a reputation as an especially fierce monster-killer — a man known as Leroy Schwartzer. A former high-ranking member of the Guild of Mercenaries, Leroy has struck out on his own. Many try to hire him for his superior skills, but Leroy has his own agenda. He has a mission to accomplish, a vow to fulfill. This vow is known only to himself, and his one companion: his sentient long-sword Ragnarok.

From ADV: A pizza delivery boy must save the world! Young Kenta Akagi has never been anywhere except for his hometown of Lutzheim, where he currently ekes out an existence as a pizza delivery boy. Faraway places, strange foreign folks, the wars they fight, and the adventures they have are just stories to him, until he meets a young girl - the kind of girl that wars are fought over! People seem afraid of her, but Kenta doesn't understand why. All he knows is that he seems to remember her from somewhere, and that he has to protect her no matter what!

Pure Marionation is the story of Anon, a "marionette" or android cute girl. Ostensibly, she is enrolled in Waffle High (no, seriously, that's the name) to test out her AI, codenamed ALIS. Immediately, Anon's secret is discovered by classmate Miamo, who is sworn to secrecy and determines to protect Anon from...I'm not sure what.

Taken from ozaku

A Japanese police officer named Kyo Kugayama and Kyo Hoshina, a 12-year old genius with an IQ of 250, embark on a quest to investigate a person known as the Professor. Nothing is known about him, except he is said to be a genius like Hoshina and said to be linked to multiple bombing attacks in Japan when Hoshina was recalled from the US to assist the National Police Agency in their investigation of the bombing cases.

He was living a pretty normal life...until he starts to discover the dangerous life he has somehow forgotten...

From Ryoji Minagawa and Kyoichi Nanatsuki comes a world of nano-machines, cybernetic assassins, powerful telekinetic opponents, and secret organization dedicated to bringing forth the next evolution of humankind. Containing all the best elements of sci-fi, spy fiction, and conspiracy theory stories, Project Arms is about kids whose arms transform into grotesquely deformed superweapons.

From Cireus-Anime website: Saiga Junki is a normal high school boy who tends to be a little apathetic in general but who does manage to get better than average grades. When his archaeologist father, who went to investigate some ruins, is found dead, the family travels to the excavation site where Junki meets a mysterious stranger who gives him a ‘gift’: an ancient artifact that his father left for him …

Motoba Hitachi has lived a boring high school life, until his kouhai invited him to a real-life simulation event of Incubate Castle, an online game they both played. But, what seemed like a harmless replication of the game turned out to be as real as it could get. Now, Hitachi must find allies to get out and survive this reality of a game.

From ADV:
Ray was bred and raised to be a living, breathing organ donor. After her own eyes were taken from her, a stranger bestows upon her the gift of sight and something extra - she has X-Ray vision! Ten years later, Ray works as a nurse and moonlights as an underground medical doctor performing for-profit, off-the-book medical procedures. But her daily routine is interrupted by a chance encounter with an old friend that triggers Ray's memories of her hellish childhood. Ray will begin a search that will lead her back to the people who stole her eyes-and her childhood!

Rokuto Yagari is the youngest son in his family who refuses to participate in its traditional business. But one day his life changes.

The one shot was released in vol.2 of Jump GIGA in 2017.

In a world similar to that of Scheherezade's tales, a mysterious young boy named Aladdin drifts from place to place with his djinn Ugo. Ugo lives inside a golden recorder, and Aladdin is on the hunt for his true container "The Djinn's Metal Vessel".
One day he encounters Alibaba, a poor lad determined to enter one of the mysterious Dungeons that popped up a decade ago in order to make his fortune. Thus the the two begin their adventure in a Persia that never was.

Based on the game of the same name, a variety of authors and artists write a large offering of short stories starring the various characters featured in the game. The stories range from being lovingly heartfelt, packed full of comedy and gags or being downright evil or messed up sometimes!Note: These are NOT doujin. These are official comic anthologies licensed by Spike Chunsoft, the developers of the Danganronpa series.

A mysterious masked and armored man has been showing up in Tokyo, apparently fighting criminals in the name of justice. He won't be able to clean up the city alone, though, and he is looking for partners.Satou Yuuki is a kind-hearted high school student who is being brutally bullied by a boy from a powerful family and his friends. Yuuki's rage is buried so deeply inside himself that it becomes another personality, composed only of anger. When the bullies push him too far, that Yuuki comes to the surface, and only the armored stranger keeps him from becoming a murderer. Suzuki Akari is an unattractive girl in the same school, who is treated badly by everyone. At night, though, she makes herself up into a pretty girl and lets out her rage and tremendous strength on gangsters and rapists.The masked man encourages Yuuki and Akari to join him in cleaning up the crime of the city, and to use their strength to fight for justice. The three of them are surely going to have their work cut out for them! [tethysdust]

Oneshot that led to the series One Piece.

*Note: There are actually 3 versions of Romance Dawn that were written: This one was written first, then the one featured in Wanted!, and then the final version that is officially part of One Piece.

From manga-koekje:
Imagine a world full of flying dragons, talking mushrooms, burning forests, supernatural bisons and many more strange creatures... Well, Mondo, Rokuna, and Dr. Hiiragi go on some crazy adventures taking on lions and crazy monsters in hopes of creating a passageway between worlds so humans and monsters can live together.

A famous grim reaper without any fail.
Westernburg city's best hunter, Roi, known as 'Roar Scyther' for his trademark gun by the same name, goes on another mission for money!

Tatsumiyajima is the central island in the middle of a small cluster of islands, in a sleepy backwater of the Japanese isles. Not much happens there, and the island's young people go to school knowing that their lives are likely to remain peaceful and undisturbed. Or so they have been taught... but the truth is different. The fate of mankind is on the line, and Tatsumiyajima is the last line of defense against a hostile and incomprehensible enemy. At the center of it all, fighting for Humanity's continued existence, is the giant robot Fafner, the dragon that guards this final treasure of mankind.

Collection of short stories based on Persona 5 made by doujinshi artists.

Ten years ago an attack by giant monsters called Idola floating in the sky leveled Washington D.C. and awakened humanity to the existence of other life forms. It took years to develop a measure to counter them, via humanoid Idola-derived robots that are controlled by pilots via brain waves.

Ilya Kravitz is a young wheelchair-bound kid and prospective pilot taking the pilot examination who lives alone with his sister Anna Kravitz in New York City. Will he manage to fulfill his dream of becoming a Pilot? How will he fare against the Idola?