From Lezhin: Yeon Jang Hwa is a more or less average college student: she attends a pretty good university, is not too ugly, and has a nice boyfriend. Her a twin sister, Hong Reon, on the other hand, is the opposite. Being the good sister she is, Jang Hwa sets out to help her twin sister... but at what price? The truth is in the details. Original Webcomic http://www.lezhin.com/ko/comic/twin 

Kira believes that Rei and all other men in the world are dirty. She stays away from her classmates, hiding in her art. What happens when the delinquent motorcyclist and playboy, Rei, gets a hold of one of her drawings, and actually wants to keep it?

After recently moving to Onomichi, Hiroshima, high school student Tasuku Kaname is thrown into despair at the possibility that he may have been outed for being gay. Convinced his life is over, his despair turns into shock when he sees a woman jump out of a window of a nearby house. Tasuku races to the house in a panic only to discover that it's a public meeting lounge owned by the woman he saw before. Tasuku comes face to face with the woman as she walks past him unharmed, but not before she implies that she had been watching him from afar. Confused, Tasuku follows her up to the top of a steep hill where she offers to briefly listen to what's on his mind. Although Tasuku doesn't go into too much detail, he later accepts her invitation to come to the lounge to meet others with similar troubles.

After a car accident, Taemin finds himself in the body of Siwon, who was a victim of bullying at school. No longer a pushover, he starts standing up for himself but then meets Woojin, an old friend from the past. Somehow, Woojin immediately picks up Tamin's 'scent' from Siwon. What happened between these two in the past and how will it affect their future?

The next instalment of Alien 9.

It's an epidemic of accidental death! Multiple college students receive odd voicemails from themselves, messages from the future, and all they contain are the screams of their own deaths. A few days later, at the date and time of the message's posting, they die in mysterious accidents, and oddly enough, each have a candy in their mouths.

Kohinata Ayumi is about to go on a date with her boyfriend Shiro, but then she gets a mysterious call from one of her classmates!

Suddenly, she wakes up in someone else's body!?

Kaiji and Kazuya face off against each other in a high-stakes game of "One Poker," a modified version of standard poker.

The 5th part of the Kaiji series.

1. Tobaku Mokushiroku Kaiji

2. Tobaku Hakairoku Kaiji

3. Tobaku Datenroku Kaiji

4. Tobaku Datenroku Kaiji - Kazuya Hen

5. Tobaku Datenroku Kaiji - One Poker Hen

The protagonist, an author, tells the story of his encounter with a certain young girl ten years ago. During his college days, he once bore witness to a traffic accident wherein an elementary school student was hit by a truck. Strangely, the girl's friend, who was nearby, only went over to check on her after carefully saving the game she'd been playing just before. Soon afterwards, the protagonist found himself captured and confined by this girl.

From Storm in Heaven:

Kyu's greatest desire is to become a detective. To fulfill his wish, he goes to take the entrance exam to get into the detective school run by Dan Morihiko, one of the most famous detectives ever! At the exam he meets Megu, Kinta, Kazuma, and Ryu as they all try to pass the grueling three-part exam. Kyu wants to solve mysteries, and he gets his wish: his first real case appears in the midst of the exam!

This series is a complete remake of the original Mao Dante, with new designs an a story slightly inspired by the anime of 2002. This time, the timespan of the story is longer, the character design is different, and all unanswered questions left when the original series was interrupted, are answered. This time, Mao Dante has a proper ending.

From MangaHelpers:
As Japan's population grows older and smaller, and as murder rates skyrocket, the Japanese government began to implement stricter laws against the worst criminals. With even the death penalty lacking the deterring force to stop the most violent criminals, Japan brought back to life a law from the 19th century: the Revenge law. This law allows victims and their related parties to employ a governmental special forces agency to capture and attack the murderer—by reenacting the exact same methods that the murderer used on the victim.
Yamagishi Yuji is the 7th member of the Special Forces "Sukedachi-nin." Each of the members of this special forces has been chosen to enforce the Revenge law because they too have been a victim of past crimes.

From Easy Going Scans

Young Ma Go-eun and her father are about to be evicted from the haunted house they've run throughout the years. But Go-eun is not about to let the park owner demolish their haunted house and her memories of her childhood and her mother. She resolves to go to the United States to surpass trials and get a million dollar cash prize awarded to those who can survive a stay in Ghost Jack's House.

Lee Wee Jin has to cope with his tyrant sister on a master-slave basis everyday. Trying to fool himself he evades reality, thinking she's tsundere and that she really likes him. Suddenly, these delusions become all too real.

From Canis Major Scanlations:

When the President got into an accident, Shirotani Tadaomi met Kurose. On their very first meeting, Kurose could tell right away that Shirotani is Mysophobic and said that it's pretty bad while suggesting it would be better to consult a doctor about it. Shirotani was left perturbed by the encounter. Who is Kurose? And how was he able to tell Shirotani's condition?

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"Mirror" - Artbook

Set in Yokohama, this is the story of a vampire with a death wish and a priest with a "survival wish."

After hundreds of years, Mary - an immortal vampire who wants nothing more than to go to his final rest in peace - manages to discover the whereabouts of Maria, a legendary exorcist who has "Maria's Blood," which can be used to kill immortals, running through his veins.

However, this particular Maria is merely a descendent, and is himself clueless about vampire hunting. Despite that, having inherited Maria's Blood means he's constantly being targeted by vampires. Mary thus makes a deal with Maria: in exchange for Maria's discovering a way to kill him, he will protect him from those who're after his life.

Note: This manga is not BL.

A strange case occurred in London at the end of the 19th century. What is the true face of the vicious criminal roaming the city? The famous masterpiece epitomizing the phenomenon known as split personality is adapted into comic format!

A text asking me to choose whether someone should be executed?! A sociological critical insight on our legal system and justice.

After 12 long years, a white-haired boy by the name of Iori comes back to Mashira village, the place where his childhood trauma began, only to find yet another horror awaiting him.

One fateful morning, Hirofumi awakens to discover he has no memory of the previous two years. He has forgotten his classmates and everything he's learned at school. All he recalls is the car accident that caused his amnesia. When he finds a letter written to himself, he is shocked to discover that he has been romantically involved with the tragic and handsome Daigo! Can true love triumph over the loss of memory? And will Hirofumi be able to make Daigo smile again?