In the year 20XX.

Despite the fact that the citizens are monitored by IC chips, making the identification and arrest of criminals easier, gruesome murder cases targeting children by an unidentified serial killer are occurring all over the country.

Clad in a black cloak and a clown mask, a deranged serial killer known as the 'Murderous Clown' who poses 'questions' to his victims — the battle between him and the police officer, Yuuto Asakura, begins!

An ordinary office worker, Akira Ichijo, was attacked by a Minotaur on his way home from work.

In the next moment, he woke up in his office desk, Akira was resurrected from death, inherited his level and status, and possessed a unique skill called "Return from the Underworld" that allowed him to restart his life at a certain time.

Now Akira makes full use of his skill and everything he had to search and survive with his childhood friend Nao Nanase to face this cruel world!!

Chakuro is the 14-year-old archivist of the Mud Whale, a nigh-utopian island that floats across the surface of an endless sea of sand. Nine in ten of the inhabitants of the Mud Whale have been blessed and cursed with the ability to use saimia, special powers that doom them to an early death.
Chakuro and his friends have stumbled across other islands, but they have never met, seen, or even heard of a human who wasn't from their own. One day, Chakuro visits an island as large as the Mud Whale and meets a girl who will change his destiny.

Note: Nominated for the Tezuka Osamu Cultural Prize in 2017.

Strange things are happening all over town, and Amano Kouichi's having nightmares again. Several clans are spurred into action as the past gradually resurfaces, while Kouchi and his obsessively devoted younger brother Jun keep having inexplicable encounters that those around them seem to know more about than they're letting on.

What, exactly, is being set into motion, and how do the Amano brothers fit into the picture?

In the world where only the aristocrats have the power to fight the monster - mana. A youth named Kufa is dispatched as a tutor to find Mareida’s talent, a nuisance girl born in a duke’s family. If she is not talented, assassinate her. - that, is the dark side of his task.

7 years ago a strange disaster occurred in the 24th ward when laws of reality were distorted in that area. Our main character is a high school boy who lost his little brother. Can Hanako-san from his school help him find his sibling again?

But more importantly who is this Hanako-san of the 24th ward?

On her 12th birthday, Angele is infected with the strange and fatal disease that causes feathers to sprout from the body. She is sent to a solitary institution to be quarantined where she meets a man named Hakana and the wheels of fate begin to turn. (Source: Mangaupdates)
Based on the free game from Niconico.
Play the game in Japanese: https://game.nicovideo.jp/atsumaru/games/gm4581
Watch a playthrough with everything narrated: https://www.youtube.com/watch?v=wFmcgB3bikM

The manga stars the black-silhouetted "criminal" that appears in Detective Conan chapters to represent the mystery culprits.

An owner of a flower shop has a deficit management, then he encounter the forbidden plant cannabis.

“I don't want it to end…” Akira had made up his mind to confess his feelings to Himeno, the girl he liked, on the day they graduated elementary school. But what was waiting for him in the classroom was Himeno like he had never seen her before! Before they knew it, Akira and his classmates were trapped inside the school, unable to escape. Who was doing this, and why? Mysterious forces close in on the 11 fearful children, as if to laugh at them. This is the story of a harsh fate that awaits them. Does a hopeful future await them, or an ending filled with despair...?

You can't leave this island until you've killed 100 people. The most deadly survival game begins on a solitary island where desires swirl and only the strongest survive!

From DrCoke at MangaHelpers:
He has never been the type to stand out in the class. Kurihara Yuzuru has lived life by avoiding entering the lives of others, staying to himself. The story begins where he has to go to a whole new school, which means new classmates. He lacks any confidence to make new friends, so the fear of rejection drives him into a wish he never thought he would make. This single wish leads to a first day of class he would never forget. Yuzuru will have to make choices that will significantly alter others' lives, choices he could never make in the past.

The story is set in a Japan that is ravaged by plague-like rust, and details the journey of the strongest mushroom hunter Bisco Akaboshi and young doctor Milo Nekoyanagi and their search for the legendary medicinal mushroom “Sabikui”, believed to be the cure for the rust.

An adolescent ghost story that invites college student's "desire". Drinking parties, looking for clubs, romance... Chigarashi Mahina, a freshman who is busy with her flowery college life, is haunted one night by ghosts after entering an abandoned building. Nights after nights, she had nightmares of her getting raped. She then seeks help from a specialist on campus, Makube Kaoru. That was the beginning of a college life filled with desire and fear...

Countless tombstones stand in rows throughout a small community, forming a bizarre tableau. What fate awaits a brother and sister after a traffic accident in this town of the dead? In another tale, a girl falls silent, her tongue transformed into a slug. Can a friend save her? Then, when a young man moves to a new town, he finds the house next door has only a single window. What does his grotesque neighbor want, calling out to him every evening from that lone window?

Niizuma Tomoki has been re-assigned to the Special Investigations Counter-Measures Unit after her one month suspension. This basement unit only has two others assigned?! The future of police is entrusted in the hands of the pretty-faced young mathematician called Mikoshiba Gakuto. Objectively weighing the truth of cases from a mathematical approach. Clearly and splendidly exposing the depths of the human heart with numbers!

The story centres on the oddities that appear in the distortions within everyday life.

What destiny awaits them after the screaming?

After abruptly departing from a train in a small town, a couple encounters a “weeping woman”—a professional mourner—sobbing inconsolably at a funeral. Mako changes afterward—she can’t stop crying! In another tale, having decided to die together, a couple enters Aokigahara, the infamous suicide forest. What is the shocking otherworldly torrent that they discover there?

One of horror’s greatest talents, Junji Ito beckons readers to join him in an experience of ultimate terror with four transcendently terrifying tales.

A new journey begins for Sora, Donald, and Goofy. The Dark Seeker saga heads towards its climax!
Adaptation of the hit game.

From Chinatown KM:

Based on the 40mP million-view hit Vocaloid song Shiryoku Kensa, Miyashita Megumi, also known as "Gumi", was one of the only survivors in a plane crash thirteen years ago. Since then, she has been able to see two copies of every person and one of them always has a "C" on them. Thirteen years later, she now wears glasses, yet her left eye remains a puzzle. And then, her friend goes "missing".

Having reached retirement age, Hiraga Raizou (65) lands a new job that pays extremely well! And it’s top secret!! With no guarantee on your life!!! When he sets out to do the company’s mysterious work, he encounters a little girl at their “workplace” and gets pulled into an incident. Raizou took on the job to pay the medical bills for his grandson’s incurable disease, but what awaits him in this line of work…!? Author of “COPPELION” Inoue Tomonori brings to you an immoral crime action manga!! An elementary school girl and a tough old man team up to rampage through the underworld!!!

(From Fallen Angels)