From Anime News Network:

Dr. Taima is not your average doctor: a skilled acupuncturist with the ability to wield the taimashin (needles that control the flow of chi in things and are used to banish demons). He is often called upon to drive demons out of possessed persons that devour anything within their grasp - dogs, cats...even other people! Accompanied by his charming assistant, Togetsu Maki, Dr. Taima travels near and far to deal with these other-word maladies--often at the risk of his own life.

Taima's investigation leads him to Dunwich, Massachusetts, where he meets another needle wielder, Kyogo Ayakashi. As they encounter ancient evils that are best kept secret, how will these taimashin masters bait their prey?

From Midnight Scans: Shio, a female high school student who can see spirits, was saved from a dangerous situation by a black cat. Afterwards, this cat kissed her, sucking out her spirit power. Then it changed to an unrivalled handsome boy! What’s more, he vowed to protect her in exchange for her spirit power!

From Seven Seas:
When darkness falls on the foggy streets of London, demons and monsters emerge to prey on human life. But demons aren’t the only ones prowling the streets. Two women have picked up the fight as humanity’s frontline defense against the darkness--a young gun-toting nun named Sister Meg and her mysterious, eternally youthful partner Angela. Together, they have made it their life’s work to spend their nights hunting the vile demons that stalk mankind.

A young girl has recurring nightmares about a castle and a woman who tries to kill her. She is sent to stay with relatives in the for a change of scenery. En route she glimpses a mysterious but vaguely familiar castle surrounded by fog on the other side of the lake. What dark secrets does the castle possess and who was that woman in her nightmares?

From Viz:
Delve into the tortured past of Earl Cain C. Hargreaves, charismatic heir to a wealthy family full of secrets, lies and unthinkable crimes. Follow the young Cain as he attempts to unravel the secrets of his birth, all the while solving each new mystery that comes his way.

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In the Hakushaku Cain Series:

1) Wasurerareta Juliet

Includes 2 oneshots:
i) The Boys Who Stopped Time -
England, year 1918. Rupert enrolls to his new school just a few days after the murder of a maid called Noelle. He's the type that just can't sit still, so when he meets Noelle's sister, he's determined to help her find out who murdered her sister...

ii) Double -
When they were children, Ren helped his friend Emilio start his career as an actor. But when Ren didn't have any news from Emilio for two years, he decided to go to New York to look for his friend...

2) Shounen no Fukasuru Oto

3) Kafka

Includes 1 oneshot: Ellie in Summer Clothes

4) Akai Hitsuji no Kokuin

5) God Child

A shady bus tour of young men and women is headed to an elusive village called Nanakimura. A destination where people can partake in a utopian existence, free of the world's obstacles... or so goes the rumor.Heading deep into the mountains, the bus is carrying 30 different individuals, each harboring their own expectations and troubled hearts...What they had arrived to was an uninhabited village with faint, lingering scents of life as it was falling apart.Just what is the secret of Nanakimura?

Three powerful stories, three legends that transcend time and space, now you found them, they are yours. tales of heroes, horror, courage and the fighting skill that burns inside all of us, spread these tales my child... the tales of powerful, ambitious warriors...the tales of ...The wanderers.

A bizarre one-shot by Takato Yamamoto. It was featured in Ax: Alternative Manga.

Warning: Ero-Guro of a male teen...

From iskultrip Scans:
Due to the influence of the "Dragon veins", some young men and women awoke as "those with power". They'll discover their "star of fate" in a struggle to the death with the "oni" attacking Tokyo!!! The super popular action anime has become a fantastic comic!!

A cute detective solves gruesome murders.

Hachiouji Tarou is an average 2nd year high school student. Since his father died, leaving him as the head of the family, he’s been constantly pulling his brother out of trouble. One night, when he came back home, his mother's head was rolling on the floor, and an evil spirit had hold of his younger brother. Instead of helping him, he hesitated and stood frozen with fear while the spirit got away with his brother. Now Tarou is on a quest to find his brother and exterminate evil spirits.

From Yen Press:

Twelve years after her loved ones were brutally murdered at the annual family meeting, Ange Ushiromiya, now eighteen, is the sole heir of the Ushiromiya family. Ostracized by her peers, Ange seeks companionship in the pages of a diary left behind by her cousin, Maria. The diary offers a precious glimpse of Maria’s world-her struggles at school, her friendship with stuffed-lion Sakutarou, and her fascination with magic. It’s as if the diary contains the last remnants of Ange’s dear cousin…and an opportunity for Ange to discover the magic within herself…

Question Arc
1. Umineko When They Cry Episode 1: Legend of the Golden Witch
2. Umineko When They Cry Episode 2: Turn of the Golden Witch
3. Umineko When They Cry Episode 3: Banquet of the Golden Witch
4. Umineko When They Cry Episode 4: Alliance of the Golden Witch

Answer Arc
5. Umineko When They Cry Episode 5: End of the Golden Witch
6. Umineko When They Cry Episode 6: Dawn of the Golden Witch
7. Umineko When They Cry Episode 7: Requiem of the Golden Witch
8. Umineko When They Cry Episode 8: Twilight of the Golden Witch

The side story arcs are:
- Umineko Biyori
- [m]Umineko no Naku Utage ni: Tea Party of the Witches[/m]
- Umineko no Naku Koro ni Episode X
- Umineko no Naku Koro ni Tsubasa
- Ougon Musoukyoku
- Umineko no Naku Koro ni Shi: Forgery of the Purple Logic

Based on the visual novel of the same name. In 1986, between October 4th and 5th, members of the Ushiromiya family gather on the secluded island of Rokkenjima to discuss the division of the family's massive fortune upon the impending death of the family's head, Kinzo. However, when a typhoon traps the eighteen people present on the island, six people are mysteriously murdered. The remaining people struggle to survive as the murders continue, supposedly by the will of the legendary Golden Witch, Beatrice.

Other manga:
+ Triage X manga
+ Sidonia no Kishi manga

From Aerandria Scans:

"The moment you open the letter, you will be cursed. After reading the letter, you have to make two copies and send it to a close friend within 24 hours."

Everyone knows what it's like to pass notes in class. People carelessly write about things like love or gossip. One day, everything suddenly turns out evil...

Kominato Riku is a high-school student who aims to be a game designer. The girl next door is his childhood friend, Haju, who is in love with him, but he has fallen head over heels for the school idol Riko. And lastly, there is the transfer student, Nodoka. With that all said you’d think this is the start of some love-comedy harem, but a rumor spreads that Nodoka's received a message that says, “you will die soon”. Riku and the gang’s fate will change in a major way. Who will live, and who will love?

[From Tokyopop]: Beautiful Hyo-Bin Na is the new girl at school who everybody wants to meet. But Hyo-Bin is no normal high school student and she certainly has no desire to be popular. You see, she's cursed with supernatural abilities and by a dark and dangerous past. Everyone she has ever gotten close has ended up dead. Hyo-Bin doesn't want to go through the pain of lost friends and lost love again, so she vows to not get too close to anyone or to date anybody at her new school. But, alas, and of course, it isn't quite that easy ...

A Violence Jack one-shot from 2001. What happens when Jack and some bikers mysteriously get sent back into the age of samurai.