Beware the red snake! Told from the perspective of a young boy, The Red Snake is a story of the above boy, the house he inhabits, and the forest around his house that stretches on and on. The characters in the story are all mad: his grandfather, who sports a massive growth on his jaw; his grandmother, who believes she is a chicken; his father, who is vicious to the chickens he raises (except for his mother, to whom he provides eggs that so that she can claim she laid them herself); and his sister, whose affection for insects borders on the erotic. The story evolves into a classic nightmare.

The Hino Horror series:
Hino Horror Volume 1: The Red Snake (赤い蛇 Akai Hebi)
Hino Horror Volume 2: The Bug Boy (毒虫小僧 Dokumushi Kozou)
Hino Horror Volume 3: Oninbo and the Bugs from Hell (地獄虫を食う! 鬼んぼ Jigoku Mushi Woku! Oninbo)
Hino Horror Volume 4: Oninbo and the Bugs from Hell 2
Hino Horror Volume 5: The Living Corpse (死肉の男 Shiniku no Otoko)
Hino Horror Volume 6: Black Cat (黒猫の眼が闇に Kuroneko no Me ga Yami ni)
Hino Horror Volume 7: The Collection (M Collection)
Hino Horror Volume 8: The Collection 2
Hino Horror Volume 9: Ghost School (Ghost School (HINO Hideshi))
Hino Horror Volume 10: Death's Reflection
Hino Horror Volume 11: Gallery of Horrors (Kyoufu Gallery)
Hino Horror Volume 12: Mystique Mandala of Hell (Kaiki! Jigoku Mandara)
Hino Horror Volume 13: Zipangu Night
Hino Horror Volume 14: Skin and Bone

Six months ago, Karukozaka High School was sucked into the demon world, and in the ensuing chaos, only two survivors emerged: Nobu, who defeated the Demon Lord that took over the school, and Yumi, who possesses latent demon powers of her own.
Although they're both trying to put the incident behind them, the gateway to the Underworld remains open, and soon Nobu finds himself battling demons right on the streets of Tokyo. The reason for this infestation is simple: a secret organization is trying to establish a Demon Kingdom on Earth by summoning demons through the gateway.
Nobu and Yumi are the only people to have been to the Underworld and survived, so they may have the power to stop the infestation but before that can even happen, they'll have to find each other first.

13-year old Rachel awakens to find herself trapped in the basement of an abandoned building. Without any memories, or even a clue as to where she could be, she wanders the building, lost and dizzy. In her search, she comes across a man covered in badges. He introduces himself as Zack and he wields a grim-reaper like sickle. A strange bond is struck between them, strengthened by strange, crazy promises… These two, trapped in this strange building, don’t know why fate has placed them there. But they will work together desperately to find a way out…

A sophisticated collection of tales, ranging from the macabre to heartwarming to wacky. The trials and tribulations of daily life.
Volume 1: P no Higeki
Volume 2: Senmu no Inu
Volume 3: Akai Hanataba
Volume 4: Unmei no Tori

An anthology of horror one-shots by various artists.

Eyama Aito, a high school student, is the victim of daily bullying. One day a strange letter arrives inviting him to a "captivity game." He may choose one person to hold captive for one month with a chance at winning a large amount of money. He chooses the ringleader of his bullies, Aya Kirishima, and the only rule of the game is to not kill her. Everything else is fair game. Eyama's revenge begins!

From Sync Scans:

If you know the one you loved was known as the “Murder Devil”, would you kill your lover? Or, would you wait to be killed?

Includes:
Toshi Denestsu Yomigaeru Sattujin Oni
From a psychological test, he is diagnosed as having a trait of a murderer, and because of that, she is attacked with a lot of unsolved incidents?!

Migigawa no Akai Yami
Is this a curse from the girl, who was bullied and committed suicide, which causes her right eye to see only the color red?

Satsuki, a boy high school boy and his childhood friend are riding in an underground train until it suddenly stops. Upon closer inspection the denizens of the train discover a mysterious beast! Panic sets in as the passengers struggle to survive the beast and escape to the surface.

Sequel of Dorei Yuugi, with new characters.

Mitozu - a small town lost in the mountains, population 6000. Every evening at 6 heavy bell tolls start resounding down the streets. Everybody knows that after the bell sounded you must not go out until the Sun rises again. But one day this law is broken by an ignorant outsider who just returned home after 10 years in Tokyo and the horrible apparition known only as Myoudo-sama has finally found a victim to prey upon.

From Udon Entertainment:

The Grim Peddler waltzes through fairy tales, giving the stories' inhabitants their hearts' desires. But benefactors beware, for his gifts don't always turn out quite as expected! Classic fables like Sleeping Beauty, Hansel and Gretel, The Frog Prince and more are turned on their side through the unexpected reversals and terrifying twists of this all-new series.

A sequel set after the ending of Gakkou Gurashi! which details the aftermath of the characters.

New enemies, new bugs and an even bigger island.

After a genetic mutation, mosquitoes have become the strongest predator on the planet. Will mankind be able to fight back?

The story follows Miyamura, a young, unemployed man who has gone through a special experience, but lives an empty existence. However, one day he is scouted by EDC, a major game development company.

Half a year ago, a giant spiderweb appeared across the sky. For a while, it got a lot of media attention. Eventually, when nothing seemed to be happening, people carried on with their normal lives, ignoring the spiderweb. Amedome Tsutsuji lives his daily life under the spiderweb. At school, people have nicknamed him "Ninja," since it's so easy not to notice he's there. Even automatic doors won't acknowledge his presence by opening for him. But he can see what others can't: aliens are coming down from the spiderweb, taking humans bodies as hosts, and eating people.

For that reason, he uses his ninja-like ability to carefully guard his crush, Mizuno, as she goes home from school. In other words, he stalks her, but with the best of intentions. He's determined to be there to protect her when the spider-aliens attack. To that end, he teams up with another, friendlier alien named Tsuda, who gives him a powerful weapon: a faucet. Will Tsutsuji be able to protect Mizuno from the parasitic spider-aliens with his trusty faucet?

A childhood trauma has left Kusakabe Noboru, a college freshman in Tokyo, afraid of women, especially those with big breasts. Talking to them, let alone touching them is out of the question and it is no surprise that he is still a virgin. After another failed night to talk to girls with his one and only friend Takahashi, the two spot an incredibly large building called the Devil Ecstasy. They learn that it is a brothel and Takahashi convinces Noboru to use this opportunity to lose their virginity.

As the two pick out the girls, Noboru notices Meruru, a cute flat chested girl and chooses her while Takahashi picks the sexy Celine. Noboru’s fear of girls kicks in and nothing happens while Takahashi leaves happy. But when Takahashi dies the next day under unusual circumstances, Noboru learns the terrifying truth that the women at Devil Ecstasy are all succubi, waiting to suck the mojo and life out of the men who dare approach the brothel!

Meet Asahi, a female college student possessed by a vengeful spirit without any of his memories among the living! This is the struggle of the two of them searching for his missing memories, a new-age über-stylish ghost battle manga!

Yang Jaesin always dreams the same dream of a woman telling him she'll be waiting. One day, he meets a mysterious fortune teller who tells him he cannot avoid destiny and leaves him with some advice: For the path he walks, Jaesin must keep with him "the eyes that can see the isolated truth."

From Kirei Cake: Meet Sakai Hiroaki, a high school teenage mastermind with a genius-level intelligence and a lack of interest in anything that is easy to him. During one unlucky day, in an attempt to stop a student from committing suicide, he ends up committing suicide himself. After he awakens, he finds himself not in the real world, nor in heaven, but in purgatory, along with a group of others who did the same: commit suicide. Sakai discovers that he and his peers are subjected to never-ending intense death games in this world for reasons unknown to him, and he tries to find a way to escape.