This is a continuation of the story of Higanjima, featuring an isolated island surrounded by fish demons and a population of warring vampires and humans. Ryousuke, his girlfriend Kazumi, and his friend Yamaoka are shipwrecked by the fish demons and wash up on the shore of this cursed island. They soon encounter the inhuman cruelty of the vampires first hand, before Ryousuke is able to meet up with the human resistance. Ryousuke wants nothing more than to escape the island, but mainland Japan may not be safe for long. If the humans don't defeat the vampires soon, then the vampires will succeed in their plans to spread the virus to the mainland!

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!

Shinichi Kudo is a high-school student who, by using observation and deduction, is good at solving mysteries. While investigating one, he is caught by the criminals that he was watching and forced to take an experimental drug. Leaving him for dead, the criminals disappear. Instead of killing him, however, the drug turns Shinichi into a little kid.
To preserve the illusion of his 'disappearance,' Shinichi adopts a new name based on his favorite author (Arthur Conan Doyle) and becomes Conan Edogawa. Ran, his (actually Shinichi's) childhood friend takes this little boy under her wing and brings him to her home.
Conan now lives at a detective agency run by Ran's father, but his mind is as keen as ever and he continues to solve mysteries... always allowing Ran's father to take all the credit.
As far as everyone's concerned, Conan is just a little kid anyway... even to Ran. This is *extremely* frustrating to Conan since nobody will listen to a 'little boy.' Despite this, Conan has a mission... to find the criminals who did this to him and get the antidote to that drug.

Note: Won the 46th Shogakukan Manga Award in the shōnen category in 2001.

She must avoid dying in her second chance at life?!
A choose-wisely romantic comedy! ☆

On the day of her high school graduation, Ichinose Himari was shoved off to her death by her boyfriend, Taniguchi Shion... At least, that's what she thought, but when she woke up, she had gone back to when she was a second year student! To avoid dying by Shion's hands again, Himari thinks of a solution - - and that solution is to completely show Shion how she feels about him!

Himari's series of unfortunate events begins!

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.

A crime suspense story set in a forensic laboratory where specialists work to uncover clues from seemingly insignificant bits of trace evidence. The story begins when Sawaguchi Nonna, a rookie forensic researcher, meets Mano Reiji, the man who solved her parents' murder case.

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...

The story follows Hikari Shirochi, an ordinary high-school boy whose hobbies are games and PC-modding. In the first chapter, mysterious phenomena occur to his body, which conducts static electricity unusually well.

The geniuses and eminent figures that have left their names across history tend to have special fetishes. By taking this anecdotal evidence and turning it around, a class of students with special fetishes was created with the purpose of raising geniuses. Seijun Private Academy class 2-9, also known as the Special Idiosyncrasy Class. White bitch gals, peeping toms, perverted inventors, extreme masochists, exhibitionists…… Itou Manami, a fledgling virgin teacher has been put in charge of this class. Will he be able to fulfill his responsibilities as a teacher against these students and their special interests!?

This is the sequel to the popular Kindaichi Case Files franchise, set 20 years after the original version! Hajime is no longer a student detective, but is a poor office worker who has to deal with the daily pains of adulthood. No longer wanting to solve cases anymore, he keeps his head down and tries to go about his daily work as quietly as possible. But crime never takes a break, and it isn't long before Kindaichi gets dragged into cases that occur around him. Starting off the new series, we revisit Uta Island, for the fourth edition of the Opera House Murder Case, where the Phantom of the Opera is planning a bloody revenge.

A cute girl came knocking at the protagonist's door, but for what reason may it be.

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.

In order to eat me, my enigmatic stalker is protecting me from other strange women―

A high school boy, Sakurai, has a secret he cannot tell anyone: he has been plagued by stalkers since he was a child.
One day, his classmate, Ueda, suddenly transforms into a monster, revealed to be one of his stalkers.
Miyako, who has always been closely following him, appears and saves him.
She tells Sakurai that the monsters, commonly known as urban legends in Japan, are after him because they love him.
What will be the fate of Sakurai who is loved by countless creatures disguised as beautiful girls?

Links:
Author's Pixiv: https://www.pixiv.net/en/users/25451722
Author's Twitter: https://twitter.com/tadaresan

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)

Oda Teruasa is a high school student gifted with intelligence, good looks and wealth, making him the "perfect scion" of the Oda Group: a powerful conglomerate whose name is known all over Japan. But then he gets caught up in a nightmarish game of winner-takes-all against the son of the Belmont mafia family...