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...

After souls die, corpses still keep their hearts. Both protagonists Inoue and Fujiwara can see those corpses whose human hearts have died. Two lonely and special people encounter each other. They are determined to rescue the people who left their soul's corpses behind and alleviate their soul's pain. This is a moving work that soothes the spiritual wounds!

It is the year 1999. In Nagano Matsushiro stands the pyramid of Japan, the private Voltstein Academy.

This place is famous for repeated occurrences of occult phenomena within its premises. Hence, it is also called the Occult Academy. The dean is committed to studying the occult, while the students are zealous in their everyday schoolwork.

One day, the dean passes away and his occult-hating daughter, Kumashiro Maya, visits the academy. There, she meets a self-proclaimed spoon-bending "time agent" from the year 2012, Uchida Fumiaki. As the two encounter various bizarre phenomena within the academy, the reason for Fumiaki's timeslip to 1999 becomes clear.

Chris is a tomboy whose relatives send her away to a boarding school after her father dies. As she grows up in Victorian England, Chris must decide whether to give in to what society expects of her, or to challenge it and follow her own dreams.

From MangaHelpers:
Multiple instances of mysterious mass deaths are erupting all over the city. The only similarity between each mass death is the time in which the victims were found dead. Trainee doctor Sasaki finds himself in the midst of one of these mass death events. He must now fight his way out of a dungeon ruled by a man-eating monster: "Hitokui." As other humans are slaughtered and eaten alive around him, will he be able to escape out of this dungeon and bring an end to these mass murders?

The card reads as follows:
Congratulations! You are one of the 1 in 100,000 people who has been entered in the amazing LIAR GAME TOURNAMENT!

Along with the postcard there is 100 million yen in notes. That's the beginning of the Liar Game. When the game ends, in 30 days, you will have to return your 100 million. If your opponent steals them, he can keep them as a prize, and you will have a debt of 100 million...

From ShoujoMagic: Story 1: The Indigo-Blue Queen ~The Stage Actress Murder Case~ Riko adores the talented stage actress Katzuki Ichie, who is best known for her performance as "The Indigo-blue Queen," a noble woman who is poisoned. However, Ichie is worth more to some people dead than alive, and she's been receiving anonymous death threats. When the curtain falls on the final show of "The Indigo-blue Queen," Ichie dies as the cryptic threats foretold, and everyone -- including Riko -- is suspect...!? Story 2: Private Room Shouko and Aiko Kuramochi are sisters who live alone with their father. Their father gets hospitalized and falls in love with a beautiful doctor... Afterwards the doctor moves in with her beautiful son... Inspite of his beauty Yuki is cold and without emotion...

One day, Toto—a 19-year-old virgin, obsessed with girls' breasts—found lying a naked, pretty girl (perfect breasts included), but who was completely without emotions. She learned to call Toto "master" and Toto named her "Kuu."

Kuu has a golem, which protects her from Toto's... advances. It also appears that Kuu has enemies who are after her for some reason.

Will Toto and Kuu make it in this romantic love comedy with a slight mystery? (Perfect breasts included.)

From MangaHelpers: Puzzle fanatic Daimon Kaito has been crazy about solving brain teasers, puzzles and riddles his entire life. He attends the prestigious Root Academy with Nonoha, but spends most of his time creating and solving puzzles. Kaito is one of the few genius teenagers that attend the school who has been given the title Einstein, along with his other just as brilliant classmates who were given the titles Galileo, Edison and Da Vinci. Together, they attempt to solve a puzzle that, since its creation centuries ago, has never been solved. But the genius students soon realize that there are dangerous forces behind the impossible puzzle. [vyc]

In a parallel world where the strongest of the non-diary holders "Akise Aru" takes the place of Yukiteru (the protagonist from Mirai Nikki) for a few days, what will happen?

Fujieda Memori works his butt off every day as a 'charming and competent' bodyguard for his brother's company. One day, a guy called Yuuki Shin appears, claiming to be interested in becoming a bodyguard. To test his ability, Memori has to work together with him. Memori was about to trust Yuuki, but then he discovers Yuuki's real identity...!?

Iruka Sumoto wishes to surpass Birou Akutaya, a detective prodigy. A disappearance case catches the attention of Iruka and drags in Birou.

Miharu hasn't been having a good year. Her mother died, leaving her only a single ring to remember her by, and her father went bankrupt – leaving her with all his debts! Though she intended to sell the ring to pay off her debts, a run-in with a hot boy and a brush with alchemy leave her unable to part with it... literally!
*Series doesn't have solid ending as far as it is known.

From Yen Press

Soon after his birth as a Nobody, Roxas joins the mysterious Organization XIII, knowing nothing of his identity. With the help of Axel, another member of the Organization, and the mysterious No. 14, who is also missing her memories, Roxas slowly begins to learn what it takes to be a part of Organization XIII…and what it means to have a heart.

From Forbidden Garden:
Chaos and mayhem is afflicting Yoshida Akari's school. There is a ruthless bloomer thief on the loose-and no one is safe!
But on a more serious note, Yoshida Akari's best friend, Hayakawa Maiko has been missing for 3 days now, and it seems as though no one is making any head in the investigation. So, Akari decides to take things in her own hands and questions the last person who was with her best friend, Student Council President Morishita Natsu. He quickly gives her the brush off stating that he is too busy with the bloomer incident.
Who is this mystery thief and just what exactly has happened to Maiko?

The Norse god of mischief Loki has been banished to the human world in the body of a young boy. In order to redeem himself, he sets up a detective agency and dispels the evil residing in people's hearts. He is joined by Mayura, a spiritually clueless high school girl with a passion for mysteries, and eventually, other Norse gods begin appearing around Loki for unknown reasons.

From Project Bite Me! Scanlations:

The creator of Baoh and Jojo's Bizarre Adventure presents a manga about magic and mysteries! You'll meet him at 13:13 pm, on Friday the 13th. He'll do an uncanny intro where he plays a trick on you! And wherever he goes, trouble seems to always follow. Who is this person who creates such incidents? None other than Cool Shock BT!

From Tokyopop: Nanaki survives a car accident to discover he is psychic. Recruited into an organization that solves cases with psychic powers, Nanaki's average life quickly turns into one of adventure and intrigue. Slacker Nanaki Shunsuke's life is turned upside down when he's hit by a bank robber's car and later meets a strange boy who claims that the accident caused Nanaki to develop psychic powers and that he is required to join LOCK, a paranormal investigations agency or be the suspect of any and every suspicious case that turns up. (thought a summary and categories were need since there weren't any :P If your into Shonen it's a good read :P Sirenic Griffin){Corrections by Silvermagic}

A mysterious command arrives from a "King".
The life-threatening "Game" has now begun for the 32 students of the first year's B Class.
One day, all of the students in Nobuaki's class received their first message from someone calling themselves the "King", in which was written a baffling command.
That first command was very easy. However, the commands began to escalate until a life-threatening game had begun.
Failing to obey the orders leads to death!! Their friendships are being undermined by a bottomless terror!!