From DrMaster:
Supernatural phenomena and strange occurrences are no sweat for the Nanami Paranormal Investigation agency, headed by Asagi Nanami. As "freak" activity grows to a terrifying fever pitch, Asagi's assistants -- Naoki, Tokiko, and Mahime -- help to solve several major "freak" cases. Freaks are creatures with the ability to possess humans and prey on their weaknesses. However, Asagi and his gang are no ordinary humans; each is equipped with a special power to vanquish Freaks.

Fujisako Aiko is a nice but somewhat solitary girl attending the beautiful and isolated Enishida Academy, a boarding school on a lush, walled-off island. One day while wandering through the island's woods, she peeks out from behind some trees to to see two foreign-looking girls around her age in a forest clearing.

One is cold and pretty. Another is cheerful and happy. In spite of their differences, Aiko soon finds out they are sisters from a royal family from another kingdom! Swept up into their luxurious surroundings and their large household of brothers and sisters, she is happy with her new friends. But what is this subtle wrongness she senses from time to time? And how come she feels so drawn to the obsidian eyes of the coldest sister of them all?

One day, a blue moon appeared, and all the cities and most of the people disappeared. Now the children that have been born since then are 13! The tale of the strange and slightly painful days of three middle school girls in the countryside.

In a faded little rural town, Kaworu lazily lives out his days. Until the day his destiny strikes, and he meets an angel. Just moments later, they quickly take off... Together, away from this reality!

The Otohime Private All-Girls High School is a very prestigious school and full of pretty girls. However, there is one male student attending the school, the director’s son Ouji. Ouji is a creepy pervert who can get away with anything because his father doesn’t punish him. He’s got video cameras all over the school to get footage of his classmates naked or near-naked and constantly sneaks around with cameras to get photos of them. The school is his paradise.
All this will change in the coming year, though. His father has decided to make the school co-ed, but with only baseball players so that they can aim for winning the National High School Baseball Championship at Koshien Stadium. In preparation for this grand dream, the director insists that the girls of the school establish a cheerleading squad. Seeing his glorious world collapsing around him, Ouji latches on to the most hopeful thing he can find: the cheerleading squad. Now he and the reluctant student council president, Itsuki, are going to recruit members and try to get this team going.

Takumi is a high school student. He is withdrawn and is not interested in 3D things. In his town, a mysterious serial murder case happens and people get panicked. One day, when he chats on the internet, a man suddenly contacts him and gives him an URL. He goes to the website and finds a blog image that suggests a next murder case... On the next day, it really happens... Takumi Nishijo suffers from intense delusions as a result of his apparent schizophrenia and the extremely secluded lifestyle he lives as a hikkikomori. One day he accidentally stumbles upon a gruesome murder scene, a part of a chain of events called "New Generation." After this, his life gets caught up in these events, and he meets a bunch of increasingly insane anime girls with swords.

Chaos;Head's story is set in 2008 in Shibuya and is centered around Takumi Nishij?, a high school student at the private Suimei Academy, and the strange and brutal murders that have recently occurred in the Shibuya area, known as the "New Generation" (????????????) Madness. The story begins on September 28 with Takumi talking to an online friend called Grim (??? Gurimu?). Grim is trying to bring Takumi up to speed about the recent New Generation events since Takumi is not interested in local or international news. A person named Shogun (???) joins the chat room midway through Grim and Takumi's conversation. After Grim leaves the chat room, Sh?gun begins to talk. He speaks in a very cryptic and confusing manner, leaving Takumi nervous. He then sends Takumi a barrage of image links, one of which appears to be of a brutal murder of a man being pinned by stakes to a wall. The next day, Takumi comes across a real life murder scene. Witnessing a mysterious pink-haired girl pinning a man up by stakes in an alleyway, he immediately realizes he is witnessing the very murder detailed in the pictures he received the day before. Convinced Shogun is targeting him and the girl he saw committing the murder is somehow connected to him, Takumi tries to avoid getting involved with other New Generation events. However, as Takumi begins attempting to distance himself from the crime he witnessed, he soon catches interest of the police. With the police suspecting him, and himself convinced that he is being targeted by Shogun, Takumi finds himself caught in a spiral of delusions and paranoia, as he desperately tries to keep himself safe and figure out why he is apparently being targeted. He eventually comes into contact with several other people related to the events, including the girl he saw committing the murder herself. Unsure of what is real or who he can trust, Takumi finds himself thrust into a much larger scheme than he ever thought possible, as the mysterious company NOZOMI carefully plots something from behind the scenes. From Baka-Updates: Takumi is a high school student. He is withdrawn and is not interested in 3D things. In his town, a mysterious serial murder case happens and people get panicked. One day, when he chats on the internet, a man suddenly contacts him and gives him an URL. He goes to the website and finds a blog image that suggests a next murder case... On the next day, it really happens... Could he be really the one responsible? And where is the D-sword that he is supposed to find?

As a manga author of a semi known series, Hirahara Daichi has the talent for coming up with stories, but is incredibly lazy and irresponsible. That leaves his two daughters, middle school student Ayumi and the even younger Sora, to pick up the slack. With the help of the assistant, Akane, the two kids are forced to draw and complete the series every month if they want an income for the household, a task no child should burden themselves with. On top of that, they must do this without people finding out because it will ruin the credibility of Daichi as an author and put a stop to the series. If being a teenager wasn’t hard enough, add to that the pressure of meeting deadlines for a national comic magazine.

The series takes place at a certain Japanese location, where a girl moves in with her aunt to a new house after experiencing some more or less shocking events back home. There she meets a boy named Fuyuki, whom she spends a lot of time with from then on. The special thing about Chinatsu is her voice, a voice which many seem to have heard before, but from where? What's so special about this girl, and what'll happen in the future?

This manga follows the unfortunate life on an extraordinary swordsman - Inoko Gennosuke.
Gennosuke was born in a social group called 'buraku' that was considered to be the filth of society, and because of that he was forced to live a life of misery.

Note: Cover image is from the 2004 reissue.

Conspiracy, betrayal, and war that revolves around the Chess Isle Crest! Amidst these events, one man's sleeping resentment and grudge starts to become conscious and real. Webtoon from Naver Please address this work as a Manhwa (Korean word for cartoons)

The son of the Qin emperor is in danger. The soldiers have cornered him and things look pretty bad for him. Just when he was about to lose hope, a stranger with golden hair appears and saves him and his mother. Follow their adventures as they try to stay alive and unite the land under one ruler!

Older cousin returns after six years to find his younger cousin has grown up really pretty.

From Scum-Scans:

Chocolat is a mature comedy series about half-orphan Tatsumi Chiyoko whose father was caught in huge debt. Now living with Omugi Matsukichi, an ex-underground king who opened a pastry shop, she gets to know people like Katou Ichigo, an ex-inmate. With people after her father's whereabouts, what will happen to her?

In a not-too-distant future, the Earth has been overrun by a horrifying technovirus. Mechanical parasites, mistakenly created in an attempt to advance technology, attach themselves to human spinal cords and turn their hosts into cyborgs.

Desperate to rid themselves of this technological terror, the remaining human survivors must band together and learn to defend themselves against their android enemies.

From Dark Horse: In a time of chaos and war, a godforsaken era, twin sons are born to an emperor. But legend states that the son of the emperor shall be born a demon! But twins? Who is the demon, and who shall reign as emperor? Chunchu is the story of a young man saved from death by his mother, banished by his people, hunted by his brother, and tortured by the demons within. Living and fighting with a low-born warrior tribe who can never trust him, Chunchu lives a life of blood and violence, every day a struggle to survive. But something mysterious lurks within his cold exterior, something that could be awakened by the touch of a woman. * Manhwa of the Year in Korea-2003.

Akabane accidentally discovers that his classmate Sumomo is one of the Japafive Rangers. He is then recruited as one of the Japafive Rangers but things don't go very smoothly.

It's not serious, feels more like a gag parody more than anything else

A series of yuri one-shots.

The first is about two childhood friends who like music and who are asked to perform at the graduation ceremony of their school.

Longing deals with two members of the archery club: Kyoko and her senpai Touko, who is ashamed of her man-like body.

Spice is about a young girls-loving teacher who wants to seduce her female students.

Innocent is about a nude portrait hanging in an art room, the model and the painter.

Rendez-vous is about two girls secretly in love who plan to elope together after being found out.

COMPILER is a story about the Igarashi brothers Nachi and Toshi, and two beauties from another dimension, Compiler and Assembler. Originally sent to conquer Earth through a game of destruction and creation, Compiler and Assembler ended up deciding that living in our world is more fun than conquering it. They moved in with Nachi and Toshi. A growing relationship began to develop between Nachi and Compiler, and Toshi and Assembler, though none of them can bring themselves to admit it outright.
Meanwhile, the people who sent Compiler and Assembler to conquer Earth were outraged by their apparent betrayal. They sent two assassins, Bios and Directory, to deal with the renegades and proceed with the invasion plan. And so, the misadventures begin...

Tsurebito is about the people who escort you from purgatory into the world of the dead. After you die you must go through your personal gate into the world of the dead, and escorts are the ones who lead you there.