A sci-fi retelling of Wagner's "Ring of the Nibelungen", starring Captain Harlock. The series was first serialized from 1990 to 1991 in Chuukosha Fan, a used car magazine (!). A sequel was published for free directly on Shinchousha's webpage from 1997 to 2000, making it probably the first online manga.

You awake on your back in a forest covered with ash, confused, uncertain. How did you get there? Why does your head hurt so much? Why is a book containing but blank pages strapped to your back? Why are you… a rabbit?

Yes, you’re a rabbit. And you are being chased by a massive wolf. What will you do now?

Centuries in the future, in the year After Colony 195, Earth is surrounded by orbiting space colonies. The colonists are cruelly oppressed by the Earth Alliance, which uses huge humanoid fighting machines called "mobile suits" to control the populace. Behind this tyranny is the secret society called "Oz," which has infiltrated the Alliance military and steered it towards its repressive course. Now, the space colonies are ready to strike back. Five young pilots, equipped with advanced mobile suits called "Gundams," are sent to Earth to wage guerilla war against Oz and its Alliance puppets. The war to decide humanity's destiny begins...

From Chinatown KM:

A collection of oneshots.

1. Mountain Love
A girl, who is under stress to get into a medical school and one day, falls in love with her doctor.

2. Mermaid Is Singing
A boy, who tries to commit suicide (because of certain medical reasons) and a girl who tries to stop him.

3. Autumn Night's Dream
A girl helps an architect to realise his real dream.

4. Echo
A girl who knows the people who killed their class president is unable to express her own thoughts.

5. The Sleeping Time Paradox

Note: In 2000, it won the National Institute for Outstanding Comics Award.

Yuu has just begun her first year in high school but has still not yet responded to a middle school graduation confession by a boy who she has always liked, but who's confession did not excite her. Yuu loves shoujo manga and she knew how confessions were supposed to feel, but she didn't feel it and she has not found a way to respond to him in months. Yuu then sees Nanami the student council president turning down a confession very thoughtfully. Yuu later discovers that Nanami has never accepted a confession because none made her feel something. Inspired by Nanami's honesty and their likemindedness, Yuu consults Nanami, but after helping her, Nanami confesses to Yuu!?

N/A

[Read left to right]In a world where hauntings are a common occurrence, ghost banishing has become your typical day-job. One of these banishers, Rad, is desperate to become the strongest in his field. That is, strong enough to take his sister back from a demon...DA: http://wickedalucard.deviantart.com/Tapastic: http://tapastic.com/series/Echofreak

Ellis, a young girl with a bounty on her head, finds herself travelling with the bounty hunter Nadie.

Together the pair head towards the mysterious city of Winay Marka, which holds the secret to Ellis' past.

The story explores the real-life events that built the fighting game community, and the strategies and play styles developed by Daigo and his fellow gamers. In Volume 1, Shinya Ohnuki, a gamer with prodigious talent, is drawn into the wild and wonderful world of fighting games after a chance meeting with Daigo. As they face off in iconic games like Street Fighter II, Street Fighter Alpha, and Darkstalkers, an enduring rivalry between Daigo and "Nuki" is born!

Sowol, a Wudang disciple who's hiding his matchless martial arts skills and living like a loafer, embarks on a journey to the Murim Alliance with his handsome junior disciple, Soha, and benevolent First Brother, Jiseo, on a mission for their master.
But they're pursued by Noak, who suspects Sowol of being a Demonic Cult double agent. While the three forge a bond through their continuing ordeals, a dark shadow descends on the peaceful murim...

What if all the nursery rhymes you heard as a child were real - and more importantly, what if they were all out to kill you?

From MangaHelpers:

Yasaka Kyoya just recently moved from Tokyo to Kyoto when he became a freshman in one of the fine arts colleges in Kyoto city, though college was only one of the reasons why he moved to Kyoto. His main objective was to get rid of his innate ability to see spirits and ghosts. He hoped that, by living in the city of the old gods and temples, he could find a cure to his annoying ability. While working at his part time job, he literally runs into a girl who mistakes him as her long-lost older brother. Running into this girl is the start of a supernatural journey that Kyoya never really wanted. [DrCoke]

A school is transported into a fantasy world that is at war with dragons, and everyone in the school is given a powerful dragon slaying sword, and told the only way to get home is to help win the war. But there is a catch, to use the swords power you must be...a virgin!

A red-hair witch impulsively purchases a boy and takes the boy home only to find out that she bought more than what she bargained for.

About a man who just come back from his military service, suddenly some monster attack his town and while he is try to apply his military knowledge to defeat the monster, he just find out that his sister is one of the six most powerful weapon on earth!

N/A

The boy Towa, forced to wander the land, killing the demonic Maen, hoping to earn the right to enter the fortress city of Edo. Yet forces are at work to forever deny him his wish.

Don’t mess with Ayu – she’s one of the top-ranked Karate club members in the region, although she does have one weakness; snakes. After one fight where she is unconscious because her opponent knows her weakness, and old friend shows up, a young man named Shunpei. He used to be a weakling, but now he may be even stronger than Ayu!

The boy Towa, forced to wander the land, killing the demonic Maen, hoping to earn the right to enter the fortress city of Edo. Yet forces are at work to forever deny him his wish.

From MangaHelpers:

This is a comic version of the 3DS game Bravely Default. The story starts with Tiz Arrior, whose village is swallowed up by a huge chasm. After he awakes to find he is the only survivor, he soon meets Agnes and Airy, a wind vestal and her fairy companion, who he joins on their quest to wake the crystals out of corruption.