In a future where cyborgs are more common than fully flesh and blood humans, a girl goes out to seek oil when her family's ration gets cut off. She needs to get it quickly so her grandmother's heart doesn't burn out, but no one has ever gone up above to the ration center and returned alive.

From Yen Press:
Sora, a young boy who lives a peaceful life on his tropical island home, is set adrift when a horrible storm wrecks the world he loves and separates him from his friends, Riku and Kairi. In another world, the Disney castle is in chaos when King Mickey goes missing, and it’s up to Donald, the court magician, and Goofy, the captain of the army, to find their king. When both Sora and the King’s allies happen upon each other and learn that the ills that have befallen their worlds are the doing of dark beings without hearts known as the Heartless, the three recent acquaintances take up arms together in an epic quest to travel to unknown worlds, set those worlds right, and find their friends!!

From Canis Major Scanlations:

Bent, who gathers minerals as a sample for his research, goes to the Akkrum mines which has been closed for a long time. Then, he saw a young person inside it who suddenly collapsed. The boy's name was Iris. Using minerals as his food, the color of the boy's pupil glistens with rainbow colors.

From K.I.S.S.: Everyone dreams of getting into Glory Hill, the university where successful applicants are guaranteed fame and fortune. Being looked up to as role models, the people of Korea are anxious to see what will become of the five new students which have been accepted. Watching from a distance a boy sits at the bus stop with an indescribable look etched onto his face. Original Webcomic

Viewed by some as a monstrous scourge and others as dark gods, the dragons are almost as ancient and powerful as Odin and the other Aesir, and for countless years have lived wild and free, unbowed and soaring across open skies. But things have changed. The dragons have been tricked and enslaved by the malevolent Loki and the traitorous Nidhogg, the Black Dragon. Now, their only hope for freedom rests with those few dragons who were able to avoid enslavement, one of whom was Iris. With ancient fire burning in her veins and hungry for vengeance, Iris has allied herself with the Einherjar so that she might gain the chance to burn Loki to ashes and free her captive brothers and sisters. Crystal Arena is a manga series based on the strategy game Crystal Arena, a story of the legendary Einherjar fighting alongside with the mighty gods in the ultimate battle of Ragnarok.

From Fate:
Set in a fictional European country in 1924, a Japanese exchange student meets a mysterious, brilliant girl who only leaves the library to sleep. Her brother, a detective, relies on her mind to solve difficult mysteries, several of which draw her away from the library.

Living in the boonies, one must give great consideration to how they will get around when they turn 16. Isaki has just turned 16 and his choice of transportation is his neighbor's Piper Cub. It might be old, but it flies well, and so...

K, a robot detective, joins the Tokyo Metropolitan Police Force’s Science Division and is partnered with human partner, Shinjo Go much to the chagrin of Chief Inspector Shiba Daizo, who distrusts the Robot. Together they battle the crimes perpetrated by the renegade conglomerate R.R.K.K. “BADO” (Robot Rental Kabushiki Kaisha – Robot Rental Company)

"Falna...as long as a Ragtonia lives, the Necromancer will feed off of their life force. He took too much from you. He killed you. But I can give your life back to you, if you'll choose to start living as a Liesian again & fight the Necromancer. When the Necromancer attacked this country, several thousand people were killed. Several thousand more had parts of their bodies stolen. They all became Ragtonia. Kill the Necromancer, release the Ragtonia and free this country from horror & destruction."

From DarkoNeko:

This is a post-war world where human-shaped weapons called scabbards exist. Cuifa and Livia are traveling government agents looking after the declining scabbard population, checking on their living condition, potential abuses, and the worthiness of their masters.

A scholar with absolutely no desire to study met a mysterious girl called 'Miss Ugly' who had no memories of her past. She was resigned to her fate of being destined to be sacrificed to the Huang Deity, but the scholar was determined to save her.

beginnning with the Bloody Valentine War between Earth and the colonies,On one side is the Earth Alliance, and on the opposite is the space colonies that form ZAFT (Zodiac Alliance of Freedom Treaty). Mankind is divided over human genetic engineering, with normal humans known as "Naturals" and the genetically altered humans known as "Coordinators".While ZAFT has a head start on mobile suit design, the Earth Alliance quickly catches up with its five prototype Gundams. With ZAFT having stolen four of the prototypes, young Coordinator Kira Yamato pilots the GAT-X105 Strike Gundam and is forced to fight his old friend Athrun Zala. Little do they know that there exist sinister forces working to bring about events that go far beyond their worst nightmares. -Taken From Wikipedia

From Aerandria Scans:

During the time when the world is full of barren lands and big ships sail out to the vast oceans, a very rare type of sub-human--mermaid--was born. Normally, they have white hair, but only in water does the color change. Among the aristocrats, they are traded for large sums of money. Hisui is a merman with scarlet hair, and he's kept by a lord. However, as he's stolen away by the pirate Ikuta and gains freedom, they start their journey together!

In the wilderness of Hokkaido, the Ainu people of Japan live in harmony with nature. Kotan Nakamura is a young Ainu boy living peacefully until he meets a tiger one day. This tiger, Dan, has escaped from a train that was carrying him to a zoo. Together, they discover mysterious ruins hidden underneath the ground.
Within the ruins, Kotan and Dan discover an old man named Upopo living there. He tells the boy and the tiger about three keys to a fantastic treasure. As it so happens, the evil Sekkoku Kou is also searching for the treasure and shoots Upopo. Before he dies, Upopo gives one of the keys to Kotan.
Now, Kotan and Dan find themselves involved in an ugly battle as numerous villains track them down to try to get the three keys so they can claim the treasure.

Mishiri Lionflame has always tried to escape his home town in the sky to go and explore the world below him, well today is his lucky day.....or is it? with the help of Yellco his flying carpet and a good luck charm his dreams come true but thats just the beginning of Mishiri's problems.

After a long and treacherous journey, our Hero finally arrives at the Overlord’s castle only to find himself being asked for help. The Hero explains how the war that the demons have brought upon the humans have killed thousands and put more in misery. The Overlord however argues that this war has made the human society band together as one and showed empirical evidence how it has increased population, increased production, boosted economy and improved society overall. Furthermore, she explains to the Hero that ending this war will result in a civil war that will produce more bloodshed than there ever was. The Hero, convinced that the only way to bring peace, relatively speaking, is to join forces with the Overlord, agrees to help with her plans!

The main series of The Doraemons. Telling about the advantures of The Doraemons.

From MangaHelpers:
Suddenly finding himself in the Sengoku era, regular high school student Sagara Yoshiharu is about to be killed in the battlefield. He is saved by none other than the man who later becomes the infamous Toyotomi Hideyoshi but at a cost to his life. With history completely changed because of Yoshiharu’s actions, he tries to make things right again but it seems that history is taking a different course than the one he learned in school. Oda Nobunaga is now a brilliant but young girl named Oda Nobuna. Yoshiharu starts working under her command to bring back history to its correct course and find his way back home to the present world.

Original webcomic A story about a guy who lost everything, and a girl who had nothing