One day, a blue moon appeared, and all the cities and most of the people disappeared. Now the children that have been born since then are 13! The tale of the strange and slightly painful days of three middle school girls in the countryside.

A short and cute story involving the characters from Konohanatei Kitan.

From MangaHelpers:
After high-schooler Nanatsu Io is crushed by disappointment in love, she finds herself pulled into a strange cafe, "Cafe Acheron," by pretty male workers, Kiba and Resato. Io decides to change herself by getting a job there as a waitress. In order to do so, she makes a contract with the cafe owner, Kiba, who tells her she must keep her stuffed bear (now conscious and referring to itself as "Father") with her.
It's only after this contract is formed that Io begins to learn the truth! Cafe Acheron connects the demon world and the human world, and it's there that many deals between demons and humans are made. In fact, Kiba and Lesath are demons themselves, and Io is already bound to them by contract! Her strange new life is just beginning.

From MangaArt:
Kisaragi Arisu has wanted to be an idol for a long time. When she blew her last chance, a guy ran into her and dropped his watch. She tries to find him, but finds herself in Channel W director's office instead. The director told her he needed a girl to do a report on his show. She readily took the job, thinking that this was a debut she was looking for. Will this be her big break?

From CMX:

Schoolgirl Makishima Misaki's life is about to get a lot more complicated! She has inherited the house that belonged to her maternal grandfather, in a small, quiet, snowy town that boasts its own local legend, the Hohopo.

Moving into the house with her klutzy widower father, she soon makes new friends — including one very unusual friend: the Hohopo itself, a shape-shifting creature who looks like a small Loch Ness Monster...when he's not masquerading as the boy next door!

Saga is a tidy young girl, living an ordinary life with her grandmother in a pleasant small town. One day she comes across a tiny pink-haired creature who seems to be ill. Thinking it might be hungry, Saga feeds it and brings it home.

The creature turns out to be snow fairy apprentice Sugar, a hyperactive, cheerful little fairy with magical skills and the ability to make snow...and she can only be seen by Saga! Now, what is Saga going to do with such a whimsical little thing invading her well-planned life, and will Sugar ever accomplish what she came to the human world for?

The son of the Qin emperor is in danger. The soldiers have cornered him and things look pretty bad for him. Just when he was about to lose hope, a stranger with golden hair appears and saves him and his mother. Follow their adventures as they try to stay alive and unite the land under one ruler!

"Long, long time ago... God descended down to the world engulfed in darkness. With the threads made from sheep's wool, He created one wondrous piece of cloth, gave rise to another world. That world is known as 'Divine Cloth'." This is the legend that was told from generation to generation.

Beneath the Earth of Divine Cloth is the world engulfed in darkness. There lives the creatures that were sealed by God known as Bugs. Frequently, Bugs plunge out from their world, creating holes on Divine Cloth. To fix these holes and reseal the Bugs beneath the ground, a young man and woman, Ryle and Marino, set out on their journey.

In a world where monsters called Yoma prey on humans and live among them in disguise, humanity's only hope is a new breed of warrior known as Claymores. Half human, half monster, these silver-eyed slayers possess supernatural strength, but are condemned to fight their savage impulses or lose their humanity completely.

Clannad is set in a high-school located in a Japanese town. Tomoya Okazaki is a third-year student who doesn't take his studies seriously. Always late for class, he's seen as a delinquent by the rest of his classmates who are busy preparing for their entrance examinations. Needless to say, he doesn't have too many close friends either.

Tomoya seems not to mind too--until he meets a few other girls from his school. Though he doesn't care much about them at first, he soon opens his heart to them as they get to know each other better.

Clannad is a romantic youth drama that's likely to be more down-to-earth than Key's other works. But like Kanon and Air, Clannad's story is expected to be another touching and heart-breaking weeper.

Based off the game of the same name.

The mighty Kingdom of Goguryeo is in the midst of a war which has raged on for decades. In need of talented warriors to help lead their people, O'Rhang Yhun is sent on a mission by his master into enemy territory to find and bring back his eldest brother. However, just as O'Rhang departs on his mission, his master, a renown warrior and general of Goguryeo, passes away. Unfortunately for O'Rhang, his 2nd eldest brother has always been jealous of his martial arts potential and betrays O'Rhang by branding him as a traitor defecting to the enemy. Having been branded a traitor, he is pursued and nearly killed. As fate would have it though, O'Rhang is able to escape from his homeland barely managing to survive when a maiden as beautiful and graceful as an angel saves his life. Join O'Rhang Yhun in this action packed adventure-love story to uncover the secret behind the martial arts his master passed onto him (Sa Shin Mu), his quest to find his oldest brother, and the score he has to settle with his 2nd eldest brother! [The Continuation of this manhwa is the manhwa NOW.]

From Dark Horse: In a time of chaos and war, a godforsaken era, twin sons are born to an emperor. But legend states that the son of the emperor shall be born a demon! But twins? Who is the demon, and who shall reign as emperor? Chunchu is the story of a young man saved from death by his mother, banished by his people, hunted by his brother, and tortured by the demons within. Living and fighting with a low-born warrior tribe who can never trust him, Chunchu lives a life of blood and violence, every day a struggle to survive. But something mysterious lurks within his cold exterior, something that could be awakened by the touch of a woman. * Manhwa of the Year in Korea-2003.

In this school fantasy story set in the distant future, creatures contaminated by pollution have overtaken the land, forcing humanity to live in isolated mobile cities called Regios. One such city named Zuellni is a self-contained school in which freshman Layfon Alseif has just enrolled. Layfon reluctantly joins the 17th Martial Arts Studies Unit led by the third-year student Nina Antalk and embarks on a series of adventures.

This version recounts a slightly different version of Layfon's story.

From Potato-Land:

A girl named Nagisa Akira, is said to be the reincarnation of the Virgin Mary aka Maria's Daughter. The Vatican, realizing this, has sent one of its elite agents, Takagi Chrome, code named “Crimzon” to protect her. Chrome is one of the elite assassins directly under the control of the Vatican, used to carry out terrorist acts and the assassination of world leaders. Chrome's new mission is to protect Akira so that she does not fall under the hands of the Protestant English. Thus begins the journey to protect Maria’s Daughter, and to find out about Chrome’s mysterious demonic power.

The normal meeting inside the normal life. The slightly special destiny that becomes entwined inside it.

A Demon wants to turn into a human because she fell in love. This is the story of her turning into a human, with, a slightly realistic view as to what might happen..... Well, only if demons were real to begin with.

This is a manga adaptation of the otome game Clover no Kuni no Alice that focuses on Alice and Gray.

From Viz:
A contagious Monster Flu is spreading around town like wildfire. Can the town's troublemaker and his friends get the medicine in time to save everyone?!
Paifu, a half-vampire half-werekoala, is always getting into trouble. With his trusty sidekick, Jose the ghost, he's out stealing watermelons, befriending murderers and causing a ruckus. But not everything is fun and games when the contagious Monster Flu sweeps through town. If the sick monsters don't get some medicine within a month, everyone will die! But only the one who has the medicine is the Witch who lives high atop Horned-Owl Mountain...750 miles away! With the help of a former sumo wrestler, Paifu, Jose and tagalong Arpon are off on an adventure! But, will they get the medicine in time or will they become victims themselves?!

From MegKF:
This 4 volume manga is about Haruko, who, after her mother's death, gains her mom's familiar and her witch's name. Unfortunately, Silk, the cat familiar, has been unable to teach Haruko any magic but dream communication. But beware, if anyone finds out her witch name, she'll have to obey that person. Is this real, or is it all in her mind?

A school girl gains self-confidence, new friends, and a cache of chic outfits when she becomes the computer-programming magical girl, Corrector Yui. She must stop the rogue A.I. Gurossa (Artificial Intelligence computer program) and his hench-programs from taking control of the global computer network. In this future, all human activity is supported by computers, so it's possible to control the world using the network.

Important note: There are two versions of the Corrector Yui manga series. This is the original one that was written and drawn by Kia Asamiya and published by Shogakukan in Japan and does not have a release date in the States yet. The Corrector Yui manga published by Tokyopop is done by shojo artist OKAMOTO Keiko and is a manga adaptation of the anime series.