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.

From Yen Press:
Wending his way home after a bender one evening, master moocher and game programmer Keita Ibuki decides to satisfy a craving for ramen at a noodle stand. Instead of slurping soup, though, he surrenders his meal to a manic girl who, unbeknownst to Keita, is a Mototsumitama, a guardian of the coexistence equilibrium. When his new acquaintance is attacked, Keita gets caught in the crossfire and loses an arm. Awakening from the shock of his injury, Keita finds himself back in his apartment... arm intact! But just whose arm is it?! Asking the strange girl raiding his refrigerator reveals only that Keita's life has become a great deal more complicated.

Neneko has the power of a "miko," but she avoids all people due to their reactions to the animal ears on her head. In her loneliness, she made herself a shikigami, an attractive man named Shichikage. One day, she's invited to work in a clinic with other miko, and she decides to go, hoping especially that she can find a way to get rid of her ears and then live an ordinary life. Once there, she meets the other miko and their shikigami, and starts her new lifestyle--making new friends and dealing with the difficulties of being a miko!

Taro Kajiura and his friends from a research group at Tonan University embarked on a trip to Ikishima Island in order to pursue the origins about Princess Kannon. At the same time, the villagers of Ikishima were holding an annual festival in which outsiders were forbidden to participate in for over 400 years. The consequences for breaking that tradition were much more severe that any of them had imagined...

Open the box to give me light, breath life into me, hold me with your love...then forget about me.

Master, I miss you.

Master, I love you too.

Master, do you remember?

I'm still lying in that box waiting for you. Waiting for you to open it again, and tell me you love me.

Jiang Ziya returned home to find that the single child in the family had become two and no one seemed to notice.

Ziya has a strange left eye, one that could see what others couldn't. Most of the time, he would ignore it but this time something abnormal is happening in his home. He couldn't possibly turn a blind eye to this, could he?

There is no peace in this world.

Some dangers require just a 'glance.'

In the face of unknown, do you choose to see -- reality?

Note from the scanlator:
The artist has said that the manhua will only cover the first two volumes of the original novel, which concludes the case "Human Doll Contract."

The original novel is "Illusions, Lies, Truth," which is [as of 21.03.2016] ongoing at 2 volumes. It's being translated by Prince Revolution!.

A slice-of-life story about two siblings, both jobless shut-ins.Haruko is a teenage girl who shares with her brother a love of laying around the house in sweats, watching television and playing video games. Her brother has a few friends, but Haruko has a lot of problems with social anxiety. The two of them pass their days happily playing together, though their mother worries about how she's going to get Haruko to shape up enough to find a husband.

Ever since she underwent a desperate surgery to save her failing vision, 15-year-old Okada Toshio has sought solace in the world of sound, falling in love with the voice of the actor from the anime Samurai Detective. When her grandfather suddenly forces her to live on her own, she encounters a boy her age with a remarkably similar voice. But how will he react to her cravings for his voice...?

In Dhaldot, a rural town located in eastern Europe, two kinds of people coexist together.

Two siblings making their way through a world rife with atrocities…

N/A

Rygart Arrow is the only one in his world who lacks the inherent ability to power up quartz, the energy source that makes all of the machines run. Nevertheless, he's pretty well connected. The King and Queen of his country of Krisna happen to be old college friends. But so is Zess, the guy who is leading the army of a neighboring kingdom in an attack on Krisna.
How did it comes to this? There's little time to ponder the implications as an army in giant, mechanized battle suits attacks. Arrow just feels like he's in the way - until he comes across a powerful, ancient mech that no one has yet to be able to figure out how to run. But his natural affinity for the suit's operating mechanism may just turn Arrow into the most important player of all.

Wonderland After Hours:
Midori's mother has finally acquired her dream home, but it isn't long before supernatural phenomenas disrupt the peace of the family. And if unexplained electricity failures, strange phone calls, and the eerie presence of spirits weren't enough, finding unexplainable blood in the bathroom becomes the last straw. Mai and Shibuya Psychic Research are brought in to investigate, but what horrors will they find in the 'dream' home that turns out to be nothing but a nightmare?

Akumu no Sumu Ie - Ghost Hunt is based on a sequel novel of the original Ghost Hunt novel, set several months in the future.

Asahina Emi, an ordinary girl dragged along to a club by a friend, has a chance encounter with Kei, a savvy, fashionable, vinyl-collecting lesbian - and what unfolds a heart-throbbing, shimmering tale of girl meets girl against the backdrop of Tokyo's vibrant nightlife scene.

The "military history story concerning boys and girls" revolves around Yuki, a girl who has lived in the rural area of Kyoto with her six childhood friends who all share a secret that they cannot tell anyone. On her 16th birthday, Yuki's fate begins to change.

Kenzaki Makoto, a debuting sculptor, was arrested as the serial killer of the Yokohama Line series of murders. He insisted that he was innocent but was sentenced to the death penalty. He was executed 11 years after the crime. But when he reopened his eyes, by a twist of fate, he had returned to 11 years ago, 25 days before the crime was committed. Burning with the desire for revenge against the real murderer, Kenzaki begins to take action. The only one he can trust is HIMSELF. The crime suspense story of two selves fighting against fate unfolds.

Kenta is a young boy who dreams about being a super hero called Wingman. All his classmates love it when he disturbs the courses to apply his holy judgment, as much as the teacher hates that. One day while coming home he finds a beautifull girl in a bikini. Aoi Yume, she gives him a wonderful item, the book of dream which can make anything written on it true, and so began the life of the real super hero for our dear Hirono.

The story follows a super heroine who stepped back and retired a decade ago. She withdrew to a humble life as a homemaker with her daughter. However, her beloved daughter was selected to become the next-generation heroine, so she returns to protect her daughter.

Note: Tamaki Nozomu also draws 2 hentai doujinshi sequels series.

From Paradise Love Scanlations:

Nanao Shuuji left his hometown where his family runs a well-known chain of supermarkets, and became a part-time teacher at a cram school. One day the son of his father’s mistress, Takatou Kazuomi, appears before him. Shuuji once confronted Kazuomi’s mother, and also injured Kazuomi as well. Kazuomi made use of Shuuji’s weakness in order to keep getting financial aid from his father, and ordered Shuuji to help him, while blackmailing Shuuji with a particular photo…?!

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 Ikemen Scans & Yaoi Is Life:

"Disgusting, not even cute." I hurt my little brother, a popular cross-dressing model, with heartless words. But none of them are true. Our parents remarried when we were little, and Yuki became my step brother. He's so cute and very, dearly important to me, but somehow my feelings changed into something they shouldn’t have. It's painful to be around him, but Yuki, who's grown up to be so handsome, keeps coming to me even when I give him the cold shoulder…