Arion, a young man, is kidnapped by Hades as a child, raised to believe that his mother was blinded by Zeus, and that killing the ruler of Mount Olympus will cure her.

For years the rash tomboyish Tsubasa had communicated with her twin through letters. She had formed the idea that the gentle Arisa led a joyful school life. But upon Arisa's sudden suicide attempt, Tsubasa vows to find the reason behind her twin's actions by taking her place at school. But will this supposed joyful life be too much for Tsubasa to handle? What does it have to do with the people disappearing from Arisa's school...

From Selene Scans:
The story centers on Arisu, who just started high school. Her first day of school, which also happened to fall on her 16th birthday, was rather catastrophic. Arisu was absolutely devastated, and when she came home, she overheard her parents arguing.

She discovered her parents are actually a devil and an angel! Her mother, the angel, explained that she and her father, the devil, fell in love and got married. Arisu is actually half demon and half angel. She cannot control her powers because of this and needs to find her true love. According to her mother, she can track him down by following the red threads tying them together--but Arisu discovers her threads have been cut, and she must find him using the old fashioned way!

It is a little bit of old story... A family lived in a castle. They were living comfortably there. However, an accident happened. The castle wanted the girl. And, the girl was left alone in the castle. What fate does the girl face?

From Tokyopop:
From a small lake nestled in a secluded forest far from the edge of town something strange emerged one day: Three young girls. The three girls, Shem, Hamu and Japheth, are sisters from another world. Equipped with magical powers, they are charged with saving all the creatures of Earth from becoming extinct. However, there is someone or something sinister trying to stop them. While saving our world from destruction, these sisters live like normal human girls: They go to school, work at a flower shop, hang around with friends and even fall in love...

A story of a man and a woman undoing their curse.

After experiencing tragedy firsthand, Amagi Souji does not feel that he is deserving of love or of loving anyone. It is not until a strange girl appears before him wanting to learn just what love is that he finds himself caught up in a battle between female warriors known as "Ark Processors." Will he learn to feel love again and will he be able to teach her what true love is?! Only time can tell!

Short comics from the official Arknights manga anthologies, based off the game of the same name.

A fan made manga by Xiujia_yihuizi based on the mobile game Arknights.
A comedic slice of life manga about operators in the Rhodes Island Pharmaceutical, Inc.

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Hundreds of millions of years ago, highly-advanced beings looking to make a planet for themselves purposefully tampered with Earth's natural processes in order to create multi-cellular life. Watching the planet's evolution closely, they continued to help life evolve further in the hopes of having actual civilization develop.
It's now 1996 in Seoul, where Hyesong, a high-school student, struggles with the usual problems of youth. The only unusual thing about him is that he's been having the same apocalyptic nightmare for an entire month; in the dream he is an great fighter and genius tactician who faces off against a seemingly-unbeatable foe.
Are these dreams not really dreams? Does he really have a role to play in the cosmic balance of the universe? And is the new girl in his class really just a normal student?

From back of book:

He-Sung has dreams of the Earth being destroyed by alien invaders! In these dreams he is a motorcycle-riding warrior, the last defense against the alien armada. By his side is a beautiful armor-clad girl with strange powers and futuristic weaponry. But these are just dreams, and they don't mean anything... right? That's what He-Sung thought... until his mystery dream girl appeared as a new student in his school! But if she is real... can the aliens be far behind?

Armitage the Third borrows heavily from both Blade Runner and Total Recall to present a humans vs. androids murder mystery set on a Mars of the future. A four-part OVA series was released beginning in 1994, and this manga utilizes the same main characters and setting yet with a slightly different plot line. Copies are exceedingly rare even in Japan.

"All armor handled in this shop is..." On his way of searching for a job, young man Kautz caught a sight of a shop recruiting for a store clerk. When he entered, what he saw was... Welcome to the journey! Welcome to the adult armor shop!

A short story based on the long running video game series of the same name.

Features anthropomorphized modern military armored fighting vehicles, ranging from tanks to self propelled guns, living daily lives in highschool.

Wandering female assassin of supernatural origin confronts men's hatred for all things different in a cruel world of dark fantasy genre.
Note: The manga continued in form of Doujinshi.

Succubus Aroma-chan is so shy, will not really, but she can't confess to the person she likes!
"Then, what if I just invade Yuuma-kun's dream and seduce him...?"
Tonight, an ero-dream that cannot be seen by other people begin!

42 year old “shachiku” (company slave) Matsuda Takeshi gets worked to death, as is customary in Japan. His one dying wish is to work for a decent enterprise, not the black company he had been working for. His wish is heard by a god who, for his own amusement, has him reincarnate as a young elf male in another world, with increased affinity for earth magic and ability to command golems. The new golem master sets out on a quest to acquire the Seven Treasures left behind by a legendary mage from 1000 years ago.

Wi Suk-Hee works at a law firm along with her crush, attorney Kang Mino. However, a new employee Jung Yoon-hoo joins the firm and a love triangle relationship forms..

In the prosperous kingdom of Pars lies the Royal Capital of Ecbatana, a city of splendor and wonder, ruled by the undefeated and fearsome King Andragoras. Arslan is the young and curious prince of Pars who, despite his best efforts, doesn't seem to have what it takes to be a proper king like his father.
At the age of 14, Arslan goes to his first battle and loses everything as the blood-soaked mist of war gives way to scorching flames, bringing him to face the demise of his once glorious kingdom. However, it is Arslan's destiny to be a ruler, and despite the trials that face him, he must now embark on a journey to reclaim his fallen kingdom.