From Yen Press:

Time holds little meaning for Beatrice the Millennial Witch. Replaying the events leading up to the Golden Banquet again and again only gives her more opportunity to play with her new favorite toy, Battler Ushiromiya. The boy's will to resist the witch remains strong as the curtain rises for a third time on the Ushiromiya family's annual reunion. But as Beatrice pulls more and more players into the game, the strain on Battler's defenses is evident. Do the other members of his family hold the key to solving the witch's riddle and sealing her defeat?!

Question Arc
1. Umineko When They Cry Episode 1: Legend of the Golden Witch
2. Umineko When They Cry Episode 2: Turn of the Golden Witch
3. Umineko When They Cry Episode 3: Banquet of the Golden Witch
4. Umineko When They Cry Episode 4: Alliance of the Golden Witch

Answer Arc
5. Umineko When They Cry Episode 5: End of the Golden Witch
6. Umineko When They Cry Episode 6: Dawn of the Golden Witch
7. Umineko When They Cry Episode 7: Requiem of the Golden Witch
8. Umineko When They Cry Episode 8: Twilight of the Golden Witch

The side story arcs are:
- Umineko Biyori
- [m]Umineko no Naku Utage ni: Tea Party of the Witches[/m]
- Umineko no Naku Koro ni Episode X
- Umineko no Naku Koro ni Tsubasa
- Ougon Musoukyoku
- Umineko no Naku Koro ni Shi: Forgery of the Purple Logic

When demons begin taking over the bodies of humans, only the strongest survive. When a practicing young witch named Miki Makimura asks her friend Akira Fudou for help with a ritual, the spell is interrupted and Akira is left on the brink of death. His body is overtaken by a powerful being named Amon. Now torn between his humanity and the demon within him, Akira uses his abilities to fight in the war between demons and humans for the future of the world itself!

The story follows Tohno Shiki, a teenage boy who, after a near-fatal accident in his childhood, gained the mysterious power to perceive lines covering everything around him. When he cuts along these lines, whatever it was immediately falls apart with a clean cut; in other words, killing it. He would have quickly gone insane from living in a world that could fall apart so easily, had it not been for a wandering self-proclaimed magician who gave him a pair of glasses that blocked his unnatural perception when worn.

Soon afterwards, he was disinherited from his family and sent to live with some relatives. For eight years he lived a normal life, hiding his special eyes, until one day he receives a letter inviting him to come back home. Shiki suddenly becomes caught up in strange and life-threatening series of events, ones that are somehow linked to his childhood accident and a forgotten past...

A little paper airplane, a magic academy, and two very different children. They make a promise at a young age--and seek to keep it once they're of age.

From the manga habit:

Rio is a 14-year-old boy with no particular special traits, except his burning love for books. He's awkward and considered odd at best by his peers. Rio also has a twin brother, Mao. Although they look alike, they couldn't be more different. Mao is good at everything, is popular, and has future plans to have a big, happy family. Despite their differences, the brothers are close.

One day, when Rio attempts to retrieve a cat that wandered into the street, he is hit by a car right in front of his brother's eyes. Everything fades to black. In the darkness, a voice offers a choice: to live or to die. Fading rapidly, Rio gives the obvious answer: to live!

Rio awakens in a world filled with foreigners and strange animals he's never seen before. That's not the only odd thing–Rio now has the form of a black cat! He quickly learns cats are revered in this world because of their special role as familiars of wizards.

It's the Era of Dragons, 1264 The Pandragoran Empire rules the biggest part of the world when all living and moving creatures in the capital, far in the east, die, including the emperor. A few days later, dragons are extinct. The people only know to blame the bloodwitch, and quickly avenge their emperor... but the world changes 644 years later on the other side of the world, The fate of five young people intertwine at Aeris, a safe haven for people of all races. From here they slowly start to discover the secrets of the massacre in Pandragora and what other mysteries might hide in this vast world named Thaeria...

A bullied boy struggling with his depression possesses an unusual power to draw phantoms of evil spirit around him. Narrow-minded and timid, he has no hope for himself. Can he overcome the darkness that threatens to engulf him? Author/Artist: http://tapastic.com/ruki

Collection of short stories:

1) Crescendo
Kazune, Yuzuru and Yanna loved the band "Crescent" and were inseperable. Then Yanna reveals she loves Yuzuru and Kazune cheers her on. Kazune discovers her family is moving away. And Yuzuru calls Kazune to ask if she'd like to go with him to a "Crescent" concert...

2) Mousou Reijou
Nene has inhired a special gift to turn the "beautiful" scenes in her head into reality. Only the one she loves with all her heart can help her control it. One day she gets dropped in front of Tatsumis house, the boy she loves. He has to take care of her from now on...

3) Kokoro Prism
Haircut, makeup and contact lenses. The new me. Nahi uses her day off from cram school to go to the beach as a different person. Her classmates don't recognize her. Beach bums try to pick her up. She's saved by a mysterious boy named Yoh who says, "Don't I know you from somewhere...?"

4) Link - Kimi no Tenohira
Miyuu was devastated when she saw her boyfriend kiss another girl. When she slaps her hands against the mirror in her room, it changes scene and she's staring into the face of a strange boy...

5) Synchronized Night
Like the other girls in her class Remu relies on her dreams to predict her future. Her latest dream predicts success in love--and classmate Mamoru blurts out he had the same dream! In eerie succession his dreams match hers. But then her dreams have her pursued by a dark figure. Is it Mamoru? Does he have the same dream?

On the corner of Chinatown, the two of them crossed, The boy name is Inumi Haserou, high-school bodyguard who takes 1000 yen for each trouble; the girl name is Nata, self-styled Sage who mysteriously collapsed in the back alley. Deciding to protect Nata, Haserou would have to face the sudden change in his daily peaceful lives, as a group of Vampiric being who consumed people Ki, called [Demonic Sage] starts to attack them. Their purpose: to hunt Nata, who holds the key as the powerful weapons capable of turning them powerless! Comicalization of a new series written by the Author of Rental Magica, starts here!

Due to an incident, a misanthropic sorcerer, Neverheart/Nebelhaut, has to go into town. There, he discovers an abused fairy in a side-show of a traveling circus. On a whim, he "liberates" her for part of his collection. Who is this creature, and what is he going to do with her?

From Viz:

Shurei Hong, destitute but of noble birth, has always dreamed of working as a civil servant in the imperial court of Saiunkoku, but women are barred from holding office. The emperor Ryuki, however, refuses to take command, leaving everything to his advisors. Shurei is asked to become a consort to the emperor to persuade the ne’er-do-well ruler to govern.

Shurei enters the palace as Ryuki’s consort, but he has yet to seek her out. It is rumored that men, not women, share the emperor’s bedchamber. Shurei must think of a way to stop the emperor from shirking his responsibilities, but she has to find him first!

From Fateful Encounters:

Four years ago, Prince Lulnavul fell into an eternal sleep due to an unknown curse. The king then made a proclamation: whoever wakes the prince will receive any reward they choose... but up until now, not one has achieved it. Now, Witch Sayla, scorned by the outside for being a witch, attempts this task as the 99th contender, not for the sake of the prince's hand in marriage like the princesses before her, but solely for the king's national treasure, the Sapphire of Illusions. Can a witch, who is hated even in fairy tales, be the heroine of this one? Follow Sayla as she goes to meet this sleeping prince inside his dreams.

A cute story about a girl and a trip to frog land.

This is the sequel to Violinist of Hameln. So read that first.

This series takes place in a fantasy world with famous composers' music, magic, friendship and dark secrets. Our main character of this story is a young ambitious, energetic boy named Schel. (Scale, as in the musical term) Because of the general of the MagiCorps saved Schel from a Mozoku (Monsters of this world) he has a dream to become the greatest magician ever. So he travels to the capital Sforzando the magic city and enters the MagiCorps School of Magic. There he meets Great, a violin magical music user, who is also the son of the great hero Hamel, who defeated the Demon King Chestra. As Schel tries to become the greatest magician, he also holds some secrets of his own. But how will Schel survive magic school with so many rivals to compete against?

Lucrezia, a noble vampire, has come to Japan to seek the supreme blood. However, when she encounters a poor shrine maiden named Inori, Lucrezia might have gotten more than she bargained for.

Great Mazinger starts after the defeat of Mazinger Z. Tetsuya Tsurugi is the new protagonist, piloting the powerful Great Mazinger, a creation of the once thought dead Kenzo Kabuto, the father of Koji Kabuto. This time the enemy is the Mycene Empire and its powerful robots.

From Del Rey:
Little witch-girls Chocolat and Vanilla are best friends, but only one of them can be Queen of the Magic World. To determine who deserves the title, they must go to the Human World and enter a strange competition. Whoever attracts the most human boys wins! The girls had planned to be best friends forever, but both of them want to be Queen. Will their rivalry ruin their friendship?

Won the Kodansha Manga Award for Children's Manga in 2005.

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.

An original side story that focuses more on Nina.

All humans in this world can use the power of the light of mana, and those who can't are considered to be subhuman 'Norma.' The world is like a peaceful utopia, and the celebrated princess Angelize leads a happy life. She believes that the only darkness left in the world is the existence of the horrible Norma. However, in a ceremony on her 16th birthday, the truth is revealed--Princess Angelize is a Norma. Now she is going to learn what her society does to Norma. She is sent to an isolated island full of others like her, who are taught that the only reason they are allowed to live is in order to fight to protect the peace of this world. Now "Ange" is part of a squad that pilots Paramails and fights invading extradimensional dragons.

A new teacher finds himself a newly appointed position as a teacher at an all girls school... on an island... in the sky! How will he make do in his new surroundings? Or the residents of this island who seem like they came from another world? And what's more, how will he fare at being a teacher?