From Jcafe24: Corpse Party: Blood Covered is about a group of high school friends in Kisaragi Academy. Kisaragi Academy was built on the grounds of Tenjin Elementary School, which was demolished after a string of disappearances and gruesome murders. After a mysterious earthquake, the students find themselves trapped in an alternate reality Tenjin Elementary School, where the murders of others trapped before them have continued unabated...

Lin is just an ordinary high school student. But on the day she transfers to a new school, she gets a video game, which sends her to the world of King Arthur. There, she meets a mysterious wizard, who tells her that her mission is to find and gather the Knights of the Round Table and find the Holy Grail.

From Asclepias Scans:

Park Min Gyeom is a human with a disease that makes him produce excess blood. Kim Chun Sam is a half-vampire who needs blood to live. So begins an unusual symbiotic relationship between "predator" and "prey."

Note: This series contains additional (optional) 18+ scenes.

An action fantasy manga that takes place in both this life and the next, featuring the boss of the guard tribe that protects the city, Jang Gwang Nam.

What would you do if you could stop time? Moritani for one is using her unusual ability to stop time for three minutes a day to observe the people around her. One day, she chooses to "observe" class idol Murakami's panties - only to find herself in a very compromising situation when her classmate turns out to be immune to her power.

From Go! Comi:

Like most teenagers, Mashiro Ichijo has a secret. But Mashiro's secret is that he’s neither fully male nor female! So far, Mashiro's been able to live his life as a boy, but all this changes when he's informed of a new class he must take in order to graduate from his elite prep school. To pass, he must find the “Key”…and the only way to find it is to enter into a nightmare world where his body and soul are put at the mercy of the worst kind of enemies: his classmates!

In the corner of a certain town, there is a teashop where the master, Tsukasa, obtains and cares for plants from the depths of hell.

SERIES 5: Vento Aureo
Set in 2001 Italy, the story follows Giorno Giovanna, son of DIO, and his dream to rise within the Neapolitan mafia and defeat the boss of Passione, the most powerful and influential gang, in order to become a "Gang-Star" and make the world a better place. With the aid of a capo and his men, as well as his own resolve, Giorno sets out to fulfill his goal of absolving the mafia of its corruption.

Sihoon is a boy who lost his parents and lives with his older sister. This story begins as he meets Mephisto that came to the world to find Faust and makes a deal with Mephisto to supervise the fights between Mephistopheles and Faust.

Kageyama Shigeo (a.k.a. "Mob") is an 8th grader with psychic abilities. He could bend spoons and lift objects with his mind from a young age, but he slowly began to withhold from using his abilities in public due to the negative attention he kept receiving. Now, the only thing he wants is to become friends with a girl in his class, Tsubomi. With his psychic "mentor" (who has no psychic powers), he continues his daily life, attempting to realize his purpose in life.

Won the 62nd Shogakukan Manga Award for Shounen.

Chiko is a high school student who can see other people’s red threads, which is the thread that connects one person to his/her soul mate. She uses her ability as a musubi-ya to advise her schoolmates on their love lives, for a fee of course! But upon stumbling upon a hidden room at her school, she sees a mysterious looking white spool of thread that suddenly comes alive and traps her. The next thing she knows, her body has become like a ten-year old kid again and the only way to get back her body is to use the mysterious thread to expel evil spirits and become a real musubi-ya!

Alice Ryouhei will leave high school soon, but he's trying to avoid thinking about his future. Late one night, when he's hanging out with his tough friend Karube and his silly, girl-crazy friend Chota, they see fireworks. After one blindingly bright explosion, they find themselves waking up in a different world. In this 'Borderland,' people are forced to either participate in potentially deadly games or simply die. Will Chota, Karube, and Ryouhei be able to survive this dangerous new world, and is there a way they can get back to their original lives?

A spiral love story. Kouno Jun is a lively character who lives life with all his might. In kindergarten, he falls in love with Hasebe Rino, the most beautiful girl in his class, and he confesses to her. Hasebe accepts his love, but the moment she gives her answer, she vanishes on the spot. Failing to figure out what's going on, Kouno asks his friends about Hasebe, only to find out that no one remembers a single thing about her. She has just vanished, along with all memories about her, except for those of Kouno.
While Kouno leads a weary and desperate high-school life, Hasebe appears again as a transfer student. However, this Hasebe is not exactly the Hasebe he knows.

From MangaHelpers:

There are huge monsters wreaking havoc in Mikagura Kiriwo's city. Building on his father's work, Kiriwo has created a serum that turns him into a giant monster for a short time. He uses this serum to help protect the town from a monster one day--only to find that everyone thinks he's an enemy, too! Everyone at school and in the media hates the "black monster" that he became, due to the massive destruction he did to the town around him. A girl from his class even has to quit school, due to problems caused by the "black monster." Will Kiriwo be able to show that his monster form is really intended to be a savior? [tethysdust]

The "mysterious school comedy" centers on the unusual members of a high-school literary club. Touko Amano, a high-school senior who calls herself the "literary girl" as the club president, is actually a supernatural creature (youkai) that devours stories — she tears pages from books to munch on them. Her club subordinate is Konoha Inoue, a second-year high-school boy who writes stories every day for Amano to eat. He once wrote an award-winning novel, but he wrote it under the penname Miu Inoue so readers thought the author was a mysterious 14-year-old bishoujo novelist. The stress from the novel's fame and its movie and television drama plans turned Inoue into an introverted recluse.

Adamsville” is an all ages graphic novel series about two middle school friends who must work together to solve a series of supernatural mysteries in their hometown. What they discover is a vast conspiracy that threatens to destroy everything they know about their lives, town and their future. Now they’re the only one’s who can stop the coming catastrophe.

When a zombie apocalypse hits during the practice of a high school basketball team, it's a whole new life for the coach, Jeff. The world's turned upside down and the girls seem to be handling the changes way better than Jeff, who has troubles adjusting. A close-knit group of friends, the girls are eager to tackle this new world with its challenges!

In this world, every child is born under a god. Some gods are weaker than others. Some gods are stronger than others.

Children born under weaker gods become defunct in society, and cannot attend high school. Instead, they must get jobs after middle school. High school in this world is a place that trains students to use their stronger gods. They have one thing in common: They can grant wishes if the correct price is paid.

Leerang turns back time a day, and pays dearly for it. To reverse his wish, he must attend high school and try to use the powers of his cat god once again.

After being declared clinically dead, traveling salesman Ed Zamsa tries to go on with his life regardless of his strange condition. As if things weren't hard enough without being dead.

Fushimi is a high-school student who also aspires to be a mangaka. Rin is a model who appears to have some type of psychic powers. What will happen when these two cross paths?