From Tokyopop:

Appearances can be deceiving. There is trouble in Tokyo as a mysterious terrorist organization called ALICE plots against the government. Just as the police are tasked to bring these men to justice, they are given a "secret weapon": a young girl with a mysterious past named Kasumi Asakura. She may look innocent, but she walks softly and carries a big gun.

20 years ago, there were two forces who fought against each other - the Eve "Balance" and the Evil Knight "Imbalance". The Evil Knight strained to destroy Eve who maintains the nature, peace, equality, and beliefs of the world.To prevent the Imbalance from destroying the world completely, Eve extracted herself to 5 to preserve her existence in the world. Contrary to the people who support Eve, there's also an organization that supports the resurrection of the Evil Knight even though he's long gone.This story revolves around a boy named Xavier who is one of the prime suspects for being the Evil Knight.

Neo Verona. A land floating high in the sky ruled by the Capulet family. That is until one night, when the long time rivals of the Capulets, the Montagues, storm the palace, killing the duke, his wife, and his men. All are killed but Juliet, a young daughter of the Capulets who is rescued and spirited away to safety before she could be killed. Fourteen years later, Juliet remembers nothing of her gruesome past, and lives with the small band who had rescued her, the only family she has. It is not safe for Juliet to go out undisguised, however, as a search for the Capulet heiress is still underway. So in public, she dresses as a boy, a young man named Odin, at the request of her "family". Though she is technically not allowed to, Juliet has another secret identity: The Red Whirlwind, the daring and righteous hero of Neo Verona, famous for saving any in danger with his (or rather, her) sword and advanced combat skills without killing anyone. It is on one of these "rescue missions" that she first meets Romeo, heir of the Montague house. By chance, they fall in love–a forbidden love that neither side will allow. Things get even more complicated, however, when Juliet finally learns of her true identity and is told that she must kill the current duke–Romeo's father.

Another dead body has washed ashore, and the adorably cute, pony-tailed doshin Aki wants to find the murderer. Instead he meets mysterious Kuga who seems to know more than he is willing or can say, but what else needs to be said as Kuga captures Aki's lips? Are Kuga's feelings real or is he trying to distract Aki from his investigation?

From Viz:

Shy Chise and nervous Shuji are high school seniors in a small town and have just started dating. But everything changes when Shuji discovers that Chise has been engineered by the Japanese Self Defense Force to transform into the Ultimate Weapon! Soon Chise is torn between realizing her potential as a devastating fighting force and her desire to share a bowl of ramen with her new boyfriend!

No one knows that Aira Hernandez is a secret agent. That's not all, she is also hiding her feelings for her boardmate, Lory. What will happen as she delves further in a murder case related to Lory's could-be boyfriend?

A young boy inherits an old house, but it's not without a previous tenant.

SIN takes place in a post apocalyptic future derived from a universe very similar to ours. The inevitable lack of resources to sustain humanity on Earth had split the world into two warring factions, the United Nations (U.N.) and the New Earth's Alliance. (N.E.A.). After years of unnecessary conflict and technological advancement in weaponry, both sides eagerly stumbled into peace to avoid extinction. Now under the rule of the newly formed United Earth's Federation (U.E.F.) space has become the last hope for the human race. However, with resources more scarce than ever the clock is ticking. How do we decide who's privileged to live and who's not? What happens to those of us left behind? A world now loosely controlled by a single totalitarian government, overrun by gangs, private military groups, freedom fighters, and death; Life seems to provide no more than a fruitless future. Regardless, there are still those of us that fight, we fight each other, we fight the system, we fight for our loved ones... whatever the reason, we battle for answers.

From NOIR:

Lena Ha is a beautiful and a tough girl who is the captain of the kendo team. She meets Hye-Min Kang, the son of the president of a big company in Korea, and the two seem to fall in love at first sight.

But when Lena learns that she and Hye-Min are half-siblings, she runs away and falls into a strange body of water. When Lena wakes up, she finds herself in a strange kingdom...and learns that she may be its only hope. Now Lena, disguised as Ley, is ready for many adventures.

From AQUA Scans:

The people that are infected with the maka's sprout, are fated to feed the flower until it blooms, which ends their lives.
The maka -humanoid demons-, carrying its own sprout, are chased by Satsuki, and the maka known as Blue Rose greets Satsuki as a "Hero". What will this encounter bring...?

Whoever wins... we lose.

By Azula
An 8 year old child, along with his brother, managed to escape from the disasters of an army's merciless killings! His own past, how much could people possibly know? His own heart, who could possibly understand? These questions was the "revenge-mindset" that has lingered the brothers through extensive training to become insanely powerful in the martial-arts. Now, this same 8 year old child has grown into an adult and is now a King! He is the Leader of the Southern Barbarian Sect. He is known as the southern barbarian, SANDSTORM..!!

Two young men vow to transform the destiny of Japan, by any means. As children, they survived the horrors of the Cambodian killing fields together. Now, can they topple the leaders of both the Japanese Parliament and the yakuza crime syndicate?

Although cold and calculating when need be, Hojo and Asami exemplify the traits their colleagues lack: loyalty to friends, compassion for the downtrodden...and an irresistible way with women.

Deputy Police Chief Ishihara sets out to expose their ingenious machinations, but instead falls helplessly in love with Hojo...

Note:
While this was originally 12 volumes in Japanese, when translated into English by Viz it was printed three ways: first in comic book form (each issue had 2 chapters), second in a 5-part 14-vol compilation of the comic books, and finally in a 9 volume manga series. Because the translation is so early, the books were flipped to English left-to-right orientation.

The nine English volumes correspond to these compilation parts, floppy issues, and original chapters:

V1: Part 1, Issues 1-4, Chapters 01-12
V2: Part 1, Issues 5-9, Chapters 13-27
V3: Part 2, Issues 1-5, Chapters 01-13
V4: Part 2, Issues 5-9, Chapters 14-26
V5: Part 3, Issues 1-7, Chapters 01-13
V6: Part 3, Issues 7-8, Chapters 14-16; Part 4, Issues 1-5, Chapters 01-09
V7: Part 4, Issues 5-7, Chapters 10-14; Part 5, Issues 1-3, Chapters 01-05
V8: Part 5, Issues 3-8, Chapters 06-15
V9: Part 5, Issues 8-13, Chapters 16-22

Mugen is a rough-around-the-edges mercenary with a killer technique and nothing left to lose. Jin is a disciplined samurai who's as deadly as he is reserved. Fuu is a young waitress with a good heart and a resourcefulness that emerges when you least expect it. These three unlikely companions are about to begin a journey that will change all of their lives.
It's a dangerous quest for a mysterious samurai that will see our squabbling group of heroes get into and out of trouble more times than they can count (which admittedly, isn't very high). From the cynical gentility of the nobles to the backstabbing of the Japanese underworld, Mugen, Jin and Fuu will face threats from without and within as they hurl insults and throwing stars alike. Ancient Japan is about to get a lethal dose of street justice -- Champloo style. And it will never be the same.

Toshiko Momojiri - an ordinary kind of girl - falls in love with Kuroo Samehada, a gangster who is on the run after stealing the mob's loot. Toshiko, too, is on the run from a weird uncle. This is the story of two fugitives who meet and fall in love amid violence and gunfire.

1) Bi no Isu (The Coercion Chair)
Kabu and Nirasawa have a troubled relationship, to say the least. Harsh yakuza lifestyle, torture, and violent sex are everyday occurrences for the volatile couple.

2-3) Anya no Tsubute
Sequel to Bi no Isu

4) Tokage to Choutsugai
Emiri is impotent, thanks to his trauma of being molested by his childhood friend, Fuyu. Years later, Emiri is finally seeking treatment for his condition, but why is Fuyu wearing that white coat?! And why is the nurse's skirt so short?

5) Seiritsu Shinai Asa (The Morning That Will Never Happen)
What will happen years later when senpai and kouhai meet again? Is loving someone that frightening?

The series appears to be a sequel to the earlier SD Gundam Musha Maruden. Official relations were formed between Earth and the land of Ark. At an inter-racial school attended by humans and Mobile Citizens, young Ryuunosuke befriends fellow student Kokuryu. Life at the school can sometimes be fierce, with student gangs seeking to disrupt the harmony. But in the face of this, Kokuryu reveals a powerful ability- although he normally looks like a little kid, he can transform into the maturer samurai warrior Kokuryu Gundam. The series initially involves his battles against similar robotic creatures along with Gundam friends such as the bishōnen Hakuou Gundam and good natured/rough and ready Sekijishi Gundam. Eventually a mysterious group emerges, forcing Kokuryu and company to leave simple schoolyard scraps behind and engage in life or death combat. The general merchandising gimmick for this series involves the Gundam's being able to combine. This is similar to the gimmick for the series Transformers: Energon

Midori is a high-school-aged lesbian who has just been rejected, driving away one of her few friends. In the world right now, there are creatures called "Extraneous" that appear out of nowhere, kill people, and disappear again. No one remembers when they started appearing, but the chance of being killed by one is about the same as the chance of dying in a car accident. Midori's mother was killed by one a year ago, and not only is her father rarely around, he's also deeply in debt. She gets attacked by an Extraneous on her way home, but is saved by a mysterious girl who claims that she's a god. Midori names her Hitsuji (sheep) because of her horns, and takes the girl in. They start a website, Hitsujiya, an Extraneous-fighting service provided by Hitsuji.

A military test accidentally sends a modern-day army back in time to feudal Japan. When their actions in the past begin to have an effect on the present, another unit is dispatched to retrieve them. But the commander of the lost unit has other plans. He intends to use his advanced technology to conquer Japan and change his country's destiny. -- {Summary by Mangaupdates.com}

The manga is about the Sengoku Jidai (Warring States Period) of Feudal Japan. The rulers of the land - Daimyo - and their servants - Samurai - fight to get the rule of all Japan. Especially, the most powerful ones are the Devil King Oda Nobunaga of Owari, the Tiger of Kai Takeda Shingen, the Dragon of Echigo Uesugi Kenshin, the Hojos of Odawara Castle