The story is set in "No. 6," a future model city in 2013. Raised as a top-ranking elite since the age of 2, a boy named Shion lives in an exclusive area in No. 6. On the night of his 12th birthday, he rescues a boy who calls himself "Nezumi" ("Rat"). Nezumi ran away from the city's Special Security Area. From that moment on, Shion's life is changed forever...

Kabukicho, Shinjuku – the district that burns with desire is struck by an incurable disease.

In this district, a doctor, Inui Date, runs a small medical clinic Night after night, patients with extraordinary cases come to the clinic. Things change when one day detective Maria Daigo, a troublesome patient, appears.

Set in a Shinjuku that has been plagued by an incurable disease, the doctor and the detective become entangled in one mysterious case after another as they face the darkness in this psychological thriller.
Will the two be able to save this town?

From Aerandria Scans:

Mysterious alchemist Lorenzo Lusignano, descendant of the royal family of Cyprus, is searching for the ultimate secret of alchemy – the Philosopher’s stone "Elixir." Rumors of this blood-red gem creep everywhere, but nobody seems to have seen it, so Lorenzo’s travels through Europe’s Renaissance are never easy.

Each volume has a different title:
1. Guranashisu no Meikyuu (柘榴の迷宮; Granacis Labyrinth)
2. Bara yori mo Akaku Yuki yori mo Shiroku (薔薇よりも赤く雪よりも白く; Redder than Roses, Whiter than Snow)　
3. Gothic Anatomia　(ゴシックアナトミア)
4. Ofiukusu no Keifu (オフィウクスの系譜; Lineage of Ophiuchus)
5. Sen no Yoru no Ryojin　(千の夜の旅人; Traveler of a Thousand Nights)
6. Rakuen no Kizu　(楽園の疵; The Scars of Eden)
7. Chinmoku no Shima　(沈黙の島; Island of Silence)
8. Suijou no Meiro　(水上の迷路; Aquatic Maze)
9. Death Stalker (デス・ストーカー)
10. Seichi 1187　(聖地1187; Holy Land 1187)
11. Kurowashi no Keifu　(黒鷲の系譜; Lineage of Kurowashi)
12. Kenja no Ishi: Elixer (賢者の石 －エリキサ－; Philosopher's Stone: Elixer)
13. Hatami Yo (二十三夜; 23 Nights)

What would you do if money could be exchanged for life? Sell ten years of life for a fortune, or give up everything to buy one more year. At the age of 17, a high school boy who has it all together meets a man with superpowers that are both godly and demonic. Through a deadly struggle for his life, he stumbles upon a world "on the other side"!

From MangaHelpers:

High-school girl Yui found a mysterious boy lying unconscious on the beach. This mysterious boy can't remember where he is from, only that his name is "Sid." After a confrontation with the locals, they discover that Sid is one of the human weaponry developed by the Japanese government, known as "Uncanny Brains" or UB. As the powers of the UB unfold before them, will Sid's arrival on this island spell doom for Yui and her friends?

Jose lived a normal life until he met this girl, Maria, who was mysteriously targeted by unknown individuals. He got himself involved and was eventually killed by her pursuers. This event led to the awakening of Jose’s hidden abilities that brought him back to life; which unknown to him, is an unimaginable power that runs in his blood. He had been carrying in him the strength of one of the strongest Archangels who was foretold in the Prophecy of the Karmanics to be the savior of mankind. (Published by www.MangaMagazine.net) This is a Filipino manga.

For years, fans of the animated series (Avatar: The Last Airbender and The Legend of Korra) have been burned with one question - Wwhat happened to Zuko's mother? Finding a clue at last, Fire Lord Zuko enlists the aid of Team Avatar - and the most unlikely ally of all - to help uncover the biggest secret of his life.
An Earth Kingdom Scholar's points of view about "family" and governing with dignity motivates Zuko to set things right within his own family. He makes a deal with Azula, releasing her from the mental institution in exchange for her help on his quest to discover the truth about their mother, Ursa. Additionally, with the help of Aang, Sokka, and Katara, the five set out on a journey towards Ursa's hometown. Tensions between Azula and the rest stir trouble and an encounter with a wolf spirit delays them even more, though as they continue, they find their own dynamic to make it all work.

From StarryHeaven:

When you have worries, is it about whether or not you are short or about your new class? Those were the problems that normal high school student, Chiyoko, faced. However, one day she meets her childhood friend Chiharu and Chiyoko’s world changed. But when Chiyoko stumbles her way into a secret underground high class club, she is surprised to find the truth…

Following the first year high school student, Arisugawa Hikaru, comes a tale of Gaitou: a thief who only appears in dreams and steals the darkness inside of people's hearts. Hikaru, one of the Gaitou, hunts down Gai rabbits, one of the lower-class demons that seek the darkness in humans. With the aid of his companion, Ban, Hikaru protects people from falling into despair, however, the game has yet to begin.

What can you do when you get mistaken for murder? Nothing. You go to prison. Lucky for you, your inmates are some of the biggest cutthroats in the prison. Seriously, you are lucky. Especially when zombies attack.

Shitou Teruaki is a former top-notch bounty hunter who's been out of the business for a while and is currently struggling to get back in the game. He takes up a relatively low-paying mission to track down a serial rapist because of his desperate need for money, and is surprised when the currently 2nd-ranked bounty hunter -- the mysterious and assertive "K" -- appears to be competing with him for the prize. But when Shitou encounters local Ice Prince Ayatsuji Kaoru by "saving" him from the clutches of said rapist, the battle for being the #1 bounty hunter really starts to heat up...

Based on the Vocaloid song "Dorobou Night Trick",

--What will I steal next?

The highly popular Vocaloid song that started on Nico Nico Douga is becoming an original comic!!
Companies distinguish winners and losers according to the laws of economics established by adults.
In order to destroy that system, the phantom thief Noel infiltrates the casino "Jailhouse"!

No-one can escape her aim.
The curtains open on the great thief show!!

--(Kisu KMS)

manga sequel to K project movie, Missing Kings.

Mihama Academy - on the surface, a closed learning environment established to nurture students who find themselves at odds with the world around them; in actuality, an orchard-cum-prison built to preserve fruit that has fallen too far from its tree.

Whatever the circumstances behind its establishment, Mihama Academy is at present home to five female students, all with their own reasons for "enrollment." For better or worse, each girl has established a routine obliging of her current situation; life moves at an idle, yet accommodating pace within the walls of Mihama.

Yet with the arrival of the institute's first male student, the nearly preposterously opaque Kazami Yuuji, the students at Mihama begin to fall out of step with their predetermined rhythms. Will Yuuji prove to be the element the girls around him needed to take hold of their lives once more, or will the weight of their pasts prove too steep a wall to overcome?

The occult mystery story follows the Norse god Loki after he is exiled to the mortal world in the form of a human child. He must collect auras of evil in order to return to the world of gods, so he runs a detective agency to accomplish this.[ANN]

16-year-old Murai Masahiko is a fat, ugly, gaming-addicted social outcast with a fetish for the smell lingering around a scumbag in his class. When a beautiful girl named Mizusawa Haruka transfers into his class, one thing leads to another and they start dating. But there's a truth that Murai is all too aware of: Mizusawa Haruka died five years ago.

A mysterious transfer student arrives to the third year, class C for Hanazono Girl's Middle School.
Akane is a plain and simple girl who was tired of her over bearing Friends, and silently thinks that it is o.k for the world to be destroyed. However, all the girls of the class wake up to find themselves in a desolated school, with count down timers. Every girl is tied to another one, and this pair must survive a 7 day Battle Royal. As it turns out, Akane is tied down to the mysterious transfer student.

Friendships crumbles, hopes are lost and sanity is tested as the game starts of with a bang!

It's 1950s Tokyo, and only the Rose Cross Detective Agency dares to tackle cases the police refuse to touch. Enokizu Reijirou is an eccentric private-eye with psychic abilities, while Chuuzenji Akihiko is a surly used book store owner and part-time onmyouji with an encylopaedic knowledge of obscure supernatural trivia. Together with their associates, they seek justice for the victims of various odd crimes.

Stand-alone side story to the Kyougokudou series, which begins with Ubume no Natsu.

From iskultrip Scans:

Uemura Takitarou is a Genius Cosplayer who can change himself from head to toe. One day, he finds his only friend, Asami Kusaka, killed by the Night Blindness Man, a serial murderer who gouges out the eyes of his victims. Tominaga Hana, a model, discovers his talent and recruits him for the company, UC, an office that solves mysteries and crimes by manipulating rumors/urban legends. Can Uemura track down the person who killed Kusaka?

From Sura's Place:

Money, lust, and desire for powers. None of that is needed for a man whose importance is as small as a gallbladder. However, if a man wants true peace of mind, he will need to have those.