From Eternal Bunny Love:

Colors. Death. Life. Questions. More questions. Will they be answered? Maybe a Roman could shed some light...

Based on an album of the same name, by the band Sound Horizon.

N/A

Story 1: A young woman who fell into a time slip.

Story 2: A group of young people who was hiking get stuck at an old shrine because of bad weather, and one by one they are killed by a moster who was sealed at a cave below the shrine.

Story 3: A group of people met up to tell their own horror stories.

They have been maintaining the balance of Yin and Yang since ancient times. Whenever the world is in chaos, there are many cases where evil spirits come to do harm to humans. The gods select talented humans and they are given their own guardian god for them to calm the over flow of Yin. This has continued all the way up to the present, so those that are chosen by god are hunters that eradicate ghosts, they are called Ghost Hunters.

From MAL: The story is set around shimatsuya (person who collects unpaid debts for prostitute houses) Saitou Ritsuke who is asked to look into ghost rumours surrounding one prostitute house.

A rather morbid, sombre manga about two high school students, Kamiyama Itsuki and Morino Yoru, who have a peculiar interest in deaths and especially in murders that are committed near to them. Due to their strong fascination with murder and highly-developed analytical skills (along with some luck), they manage to solve the murders that have even eluded the authorities. However, acting on their own sense of justice and in self-interest, the murderers are often able to escape with the murders that they have committed. Often, it is Kamiyama that solves the cases even to the most subtle of details, but he is only interested in one thing, and that is the method by which Yoru should be killed.

Note - Regardless of appearances, the fact that this was serialized in Shounen Ace makes Goth a shounen manga.

From Blu:

Welcome to last XIX century in Paris, where ball gowns swirl, laughter rings through marble hallways, and jewels sparkle—both at the throats of the elite of the city, and in the amethyst eyes of one particular young man. A phantom thief is stalking the city, and nothing beautiful is safe from his clutches!

Meet Florian, the only son of an impoverished noble family who ends up indebted to the stunning, mysterious Ray Balzac Courland. He may have been sold to repay a family debt, but you can count on the fact that Ray is going to get a whole lot more than he bargained for!

In the era following a certain natural disaster, Jyougasaki Hichiki, an escapee from The Rebirth Training Institution for Boys, makes his living as a professional thief.

A chance encounter with the mysterious and unfathomable "Bo-chan" -- the enigmatic being who dwells within the Peppermint Highway Mansion -- compels the curious burglar to infiltrate the run-down (but charming) household as a butler... But what does Bo-chan have in store for the eccentric Jyougasaki?

A red thread that entwines their fate thicker than blood, deeper than destiny.

The Jinkishi, who keeps the demons (youki) sealed in the Capital has died and his magic has dissipated. Hayato has come from Tokyo to the Capital to claim the seat of the Jinkishi. However it's the blood of the Shihoudou family that inherits this power, and the possessor, Jin, has no interest or desire in the Jinkishi. As the story unfolds they are chained together by the red spell of fate.

[From AnimeWaves]: Two kids, Kouhei and Akio, made up an imaginary girl named Hajime to take the blame for destruction of the principal's copper statue. But one day, they meet a girl that is exactly like their description of Hajime, but only they can see her.

“My name is Midou Maria. But not long ago, my name was Ichinose Rei. That Ichinose Rei had a special existence. The workforce for Ichinose Group comprise nearly half of the corporate town, Segawa, and Rei was that Ichinose family’s heir."

But that brilliant future was abruptly snatched away. Given a new name, a new gender and three hundred million, Rei—now Maria—was banished from Ichinose. With death as her resolution, Maria roamed around the streets, only to end up in some ruins. But in those ruins, there was a community: the secret base for juveniles!

This is the story of Maria's mutiny!

From Tokyopop: Eiri Kurahashi is an art school student, with a job at a local antique store. It's there that he develops a strange obsession. He finds himself entranced by a portrait of a Victorian-era girl named Cossette. It's a portrait with a strange history--everyone who has owned it has been murdered in a bizarre fashion. But the story runs much deeper than that. Cossette was savagely murdered by her lover, who also happens to be the artist who painted the portrait. When the new owner of the portrait nearly kills himself, Eiri decides to get involved. And that's when Cossette begins speaking to him...

When the clock strikes midnight, the door opens. This is when the phantom awakens, wandering, looking for the most beautiful dancer.
Loosely based on "The Phantom of the Opera."

A story of old myths, an ancient destiny, godly powers... And the young man who's expected to choose whether to be a saint or a devil while seemingly powerless against the forces that push him towards darkness.

The Ribika are a race of cats possessing ears and tails. Their bodies are lithe and nimble, and they live in the land of Shisa. However, a curse called the "Void" is spreading through the forests... One of the Ribika, Konoe, lives in a small village called Karou. One morning, he wakes up to find that his ears and tail have turned black. There is also a symbol on his body; the mark of the curse. Konoe embarks on a journey through the forest to find the truth.

From Within Silence Scans: Mia was just an average girl.. thinking that she has lived a normal life. That all changes one day when she meets a strange child with yellow hair, yellow eyes, and cat ears. Hearing the name "Laika," she wonders at the strange name and brings the child home. Will she ever regain the dark memories that she had lost?

From Vendetta Scans:
One thing is for certain - if you exercise violence, that violence will return to you in any shape or form.
The man who bakes flour-based food and runs an eatery, has a darker past than anyone could ever guess. Unless you see the name of his store.

From MyPersonal-scan/Tcmanga:

A mysterious command arrives from a "King"-----
The life-threatening "Game" has now begun for the 32 students of the first year's B Class.

One day, all of the students in Nobuaki's class received their first message from someone calling themselves the "King", in which was written a baffling command.
That first command was very easy. However, the commands began to escalate until a life-threatening game had begun---

Failing to obey the orders leads to death!! Their friendships are being undermined by a bottomless terror!!

Natsume Kanade wakes up with a terrible headache from the day before unable to remember who he is. Being confronted by a strange man with dark-rimmed glasses who calls himself "God" and being told that he is a high school teacher doesn't help. Stranger yet, everyone seems to know what happened yesterday - everyone except him.

Adaptation from the Yume Nikki RPGMaker game by Kikiyama.

Madotsuki is a girl who always dreams of the same landscape. One day, she decides to start exploring her dreams, searching for answers. There are some doors in her dreams. When she opens them, she finds all kinds of things...