After a four-year absence, Ishida Kotori (QP) returns to the city where even his face instills fear amongst the locals. Trying desperately to move away from his once violent past and live an honest life, former classmate and now high profile gang member, Azuma Ryou, has other plans for QP's future...

QP: Soul of Violence is written by Takahashi Hiroshi and set within the same universe as his other works, Crows and Worst.

Nanami Sekai gets scammed out of every penny he has, left only with a pair of boxers and a 3,000,000 yen debt. He then meets a girl, Ritori, who offers him a deal that seems too good to be true: she will take care of his debt if he will be her captain and help her with her job.

[Note]
It seems that this manga has been discontinued because the author became incapacitated during serialization and was not able to keep 2 series running.

The Hanzo Academy is not just a regular school. It holds a top secret class for ninja training reserved just for the elite. Only two girls made the cut this year, Ikaruga, a quiet but gifted brunette, and Katsuragi, a passionate and skilled blonde. Their personalities could not be more polar opposite and sparks fly even on the first day of class. Ikaruga, being a little bit ahead of the curve, outscores Katsuragi on every assignment. With tensions running high, how will these two ninja students work together when the time comes?

From Tokyopop:

Having been assigned by the human elders the mission of stopping a mystical plague that has afflicted the Youkai with madness, Genjyo Sanzo assembles his team of Youkai warriors, desperately hoping that the disease will not affect them. He sets up qualifying tests that will help him determine the loyalty and worth of Cho Hakkai, Son Goku and Sha Gojyo. The team then journeys west to rid the land of madness.

The continuation of Slayers Revolution. After the defeat of Zanaffar, Lina, Gourry, Zelgadis, Amelia, and Pocota, the prince of Taforasia, continue their hunt for Rezo’s urn, each with their own motivations for doing so. Pocota to revive his people from Rezo’s well-intentioned sleeping spell, and Zelgadis to regain his former body. However, something deeper is circling around the intrigue behind Rezo’s urn, and all will come to a head in the bustling city of Vezendi...

From Manga-Heaven: Jinna Amakura was a typical, if not a bit stingy, high school boy. Typical, that is, until he died. Or... at least he was supposed to die, but he didn't. Jinna is now considered by the powers that be as a "Soul Irregular". Enter Nagi. Nagi is a Grim Reaper on her first job - to kill Jinna and return his soul to the proper cycle of life and death. If she fails, she will be turned into her favorite dessert and eaten by the head of the Angels of Death. Not only does her job start off as worse as it possibly could, but Nagi and Jinna form an almost friendly, if not unusual relationship... just wait till her boss finds out...

Oneshot description: Inside of every human lie dormant superpowers. When these powers are awakened, some people use them for evil. Others use their power to stop those who commit evil deeds. One cruel boy named Hiruko has taken over his high school by using his superpowers. The students live in fear of him, until the day a mysterious transfer student, with his arm wrapped in a giant cast, arrives to stop him.

The demon queen subdued enormous and powerful monsters and slaughtered over half of the world's population. Surviving members of the human race elected a hero to slay the demon queen, beseeching release from her oppressive rule. However, he questions his mission to eradicate the monsters: in his opinion, they too are conscious and alive, and so he anguishes over that fact. Sheila the Demon Queen became interested in him and joined his journey, hiding her identity and with the plan to kill him after she has gained his trust. Eventually, she realizes that she fell in love with the hero, and hence their journey begins...

The end of the Holy War. The Pope, in an effort to suppress the remaining eye-witnesses who oppose his power, demands that a gag order be enforced regarding “the miracle” that brought the war to an end: the appearance of the five who bore the stigmata—the Holy Marks—the marks of God. 10 years later . . . The diabolic faction that opposed the Vatican’s power and brought about the Holy War has awakened again and has begun assassinating the once-admired heroes of the Holy War. The Vatican has refused to acknowledge the situation, treating each incident as nothing more than simple coincidence, but in the years that have passed since the Holy War ended, the Pope has been rumored to have created an occult organization called RADEM, whose orders are to fight demons though they seem to have another mission—a much more obscure mission . . . The Cardinal calls for an assembly of the region’s clergymen in the name of the Pope to discuss the situation, and to that end, an ambitious nun named Sister Rose is sent to the Teatela Province on a mission to locate Father Gabriel Iota—a priest suspected of possessing a very strong Holy Power . . .

Itsuki Minamori has fallen asleep in class and dreams about a girl from his past. He is awakened by Haruna a girl who apparently has a crush on him, but her friend Chihaya Yuuki tells her to stay away from this boy. He explains that he's spent his life being followed by evil ghosts and during the exposition, another one shows up.

Taking place in 1930s Japan and China, Kasumi Kenshiro (the uncle of the lead from Hokuto no Ken) is forced to leave his teaching job and settle an old gang rivalry with the help of his martial arts. Along the way, he meets the son of one his triad buddies, an old flame, and a mysterious old man who teaches him new techniques which will assist him in his quest.

From Dan of Population GO:

"Based off of the video game of the same name. Humans have all been killed and now animals live in the cities that once housed humans. This oneshot follows the conflicts between animals in Tokyo."

Hanagasumi Highschool is located right in middle of Kabukichou, Tokyo's #1 red-light district. Because of this, the students are constantly robbed and harassed by yakuza, gangs, etc. In order to ensure the students' safety, the Student Council came up with one solution: befriend the legendary "Tiji-kun", the strongest man in Kabukichō. Two students, Motobu Tomoko and Akazawa Ryo, were assigned the task. But when they find out the true identity of the mysterious "Tiji-kun", having a peaceful school-life turns out to be harder than it seems.

This is a collection of loosely interconnected stories where the main characters are all animals, especially the tiger who is the hero of the first book.

A 4-panel comic strip crossover series featuring characters from both "History's Strongest Disciple Kenichi" and "Skill Hunter Tekuni".

Two childhood friends Beckman Jouji and Kuranosuke reunite after not having seen each other for a while. Kuranosuke has the power to fly, but only when his best friend is by his side. Unfortunately, Miss Schrodinger has other plans for these two friends... A one-shot that shows the bond between two best friends!

A heart-warming tale of friendship, love and strength, Tsunbaka attempts to create a new archetype in the "tsun" genre of girls. Combining the fierceness of a "tsundere" and the air-headed/forgetfulness of a stupid "baka" girl, comes the titular type and character Tsunbaka. This manga focuses on her daily life and her best friend Boon, who helps and protects Tsunbaka, as well as the greatest supporting character Dokuo.This originated as a 2chan thread and was later adapted by YOKO, similar to how Onani Master Kurosawa was created.

I wanted to see you” are the words Kasugai Tenka wants to hear from a girl more than anything. And when the high school student hears it from Tsukimi, a girl literally out of this world, his life is about to get crazy. Tsukimi was a war general on the Moon, but she was exiled for the destruction she caused and her memory is wiped clean and she's changed into a bunny. She reminds Tenka that years ago, he fed her soba from his dad’s soba shop and that now that she's gained human form and her powers back, she wants him to be hers.

1-4) Tsuki wa Yamiyo ni Kakuru ga Gotoku
The rumor goes that sometimes, late at night, a white monster appears, and if you should look upon it you'll be devoured. One night, Tetsu happens to glimpse the man behind the monster, and decides that the man would be the one to teach him the sword and allow him to take his revenge. However, the swordmaster Shino is hardly interested in taking on any students. What will Tetsu have to do to get his revenge, and what happened to Shino in the past to turn him into who he is...?

5) Castilla
A dutch foreigner falls for a young samurai.

A Trigun one-shot by Boichi.