From Divine Sanctuary:
The story begins with the death of a young girl. To find the reason why she was killed, three good looking girls and a detective try to find a killer who seems to know something about it. But did she really die? And since one of the girls looks exactly like the dead girl... will they succeed to find that man...? And can the detective protect the double?

The year is 2029, and Hibino is an ex-police officer who now makes a living running errands for the leader of what appears to be a high-end gang. But how do a civil uprising in Niger, the attack on a radical military figure in Japan, and a bone-marrow thief tastelessly dubbed "The Vampire" connect Hibino to the mysterious white-haired boy who is forever confined to an enormous library reading through scores of books?

From Day of the River: “The person who killed my father...is among these people.” 15-year-old Kotobuki Ringo reunites with childhood friends she hasn’t seen in eight years since her father passed away: the calm and soft-spoken Shiran, the strong Kujyaku, the kind Masaki, and the energetic Gogyo. They were all students of Ringo’s father and all have amazing abilities of their own. Ringo comes to live with them at Shiran’s villa, but she’s not staying with them just to rekindle their friendship... She believes that one of them may be her father’s murderer, and she will stop at nothing to find out who was behind her father’s death.

Compilation of short stories:

• Hotel: Since 2079 (2006)
It is the year 2272 A.D.
A computer continues to live on in order to complete a mission in a world where all life, including Mankind, has gone extinct. This is a record of those 27 million years of its heroic struggle.
• Present (2006)
Hanako suffers from a terrible disease. After awakening from a deep slumber, Hanako has only three days to live.
• Subete wa Maguro no Tame datta (It Was All for the Tuna) (2008)
Tuna have become extinct and Jun Shiozaki will do everything possible and imaginable to bring them back.
• Stephanos
Set in modern-day Japan, our main character Noriko finds out that she is pregnant with her lover Matsumura’s baby. He, however, is an important doctor with a family and everything already. Noriko wants to have the baby, but Matsumura says that it’s actually a rapidly growing cancer and that they have to remove it immediately. It might also be neither of these things…
• Diadem
A "Diadem" is a word for 'crown' that has its root in Greek. "Stephanos", which appeared in "Mandala" 01, was also a 'crown'. It seems that we could consider this the second work in a continuing series of shorts that should perhaps be called a "Crown series".

A shape-shifter wolf who was once a human, but became a demi-immortal when his lover betrayed and murdered him, adopted an orphaned boy, who is now a young man. They travel together, exorcising evil spirits and demons. Trouble follows and finds them often, but they always manage to come out on the other side, pretty much intact.

From Viz:
It is the middle of the 21st century and Tokyo is expanding more and more, filling Tokyo Bay with landfill to make room for the bursting population. But suddenly Tokyo suffers one of its greatest earthquakes, and the landfill liquefies, creating untold damage in the newly-made urban area. The members of Self-Defense Force Rescue Squad Four are sent to help. But what they dig up is a plot of murder and destruction--one that wipes out nearly the entire squad and leaves its two surviving members, the fierce Rei and her cool, handsome partner Uozumi, in a fight for their lives.

There is only one place where they can find the work that keeps them alive, and the support so they can start uncovering the mystery that killed their squad: that's in the south-Shinjuku bar called Chicago. As the earthquake levels Japan's largest city and capital and leaves countless dead, rescue workers, Rei and Uozumi, search for survivors amidst the rubble of Bay District D only to find a mysterious string of dead bodies--bodies with bullet holes. Without warning, the pair is under fire from the air as a hail of gunfire rains down. Are these the killers, and if so, what is their purpose? Barely escaping with their lives, Rei and Uozumi discover that their squad is listed only as "collateral damage" and their records wiped clean.

"Do you know who I am?" Rebecca, a girl with no memory and a missing shoe, arrives at Angus's private detective agency. She found his business card in her coat pocket, but Angus does not know who she is. Angus invites the shivering and frightened girl into his warm home where he lives with his young daughter. Soon they become powerfully attracted to each other, but on the morning after they first make love, a man claiming to be Rebecca's fiance appears...!

From Tokyopop:

Fujiwara Sunao is a rather unusual young lady. Not only does she prefer to wear her hair short and dress like a boy, but she also possesses the power to control water! One might think Fujiwara would be an odd fit at her school, but strangely, she's not. Between the destructive and demented school president, the kooky and somewhat stalker-like school nurse, and the obsessed underclassman who wants to be her apprentice, Fujiwara may be the sanest person at the school--which is a big help considering she may be asked to save it!

Biblia Koshodou no Jiken Techou is a mystery series in which Shinokawa Shioriko, a young owner of a bookstore in Kamakura, unravels the mysteries of the ancient books that are taken there.

The story begins with a young man named Daisuke, who practically grew up without reading books due to his phobia, who brings the complete (and autographed) collection of works by Natsume Soseki, (Japanese writer of the Meiji era) that he inherited from his grandmother, to the mysterious bookstore. Will the shy and introverted Shioriko solve the mystery of the books?

Kisaragi Akira is a police officer investigating a murder case that reminds him of his past.
The memory that he forced himself to forget.
And the past that he buried in the deepest part of his heart.
The clock that was once stopped has started ticking again.

From Titania:

A manga about people trying to kill themselves, but weird stuff happens instead.

01 - Group Suicide
02 - Strange Tale of the Pylorus
03 - Paradoxical Night
04 - Dr. Suka's Villa
05 - The Spirit World Project
06 - To The Dazzling Future
07 - The Licking Woman + Mystery Pavillion (Ones-shots)

A mystery/action plot: in the 13 hours 13 children spent in space, what had happened?? It starts off 8 years after the spaceship incident, centered around one of the 13 children named Bono U. Meyer. He has an IQ of 240 and it seems people who are close to him have [coincidentally, perhaps?] been driven clinically insane. What is going on?

Iori and Nachi are the "perfect pair" of the bodyguard agency Shelter. Partners since childhood, they bicker constantly, but when the latest mission threatens to separate them, is that really okay...?

From Mangascreener:

The only common feature running through these stories is a grown-up protagonist somehow coming face-to-face with his childhood past, in a testament to the loss of youth, the disillusionment of growing old, and nostalgia for better times.

In the Adachi pantheon, this is a rare diametric view of his eternal theme of "youth," in this case youth as seen through the lens of the past. It's a powerful statement from Adachi that might even be an acknowledgment of his steadily-creeping age.

What is impressive about these stories is not the plots or characters themselves, but the absolutely perfect way he tells them, another facet of experience that comes with age. Most of the stories may require multiple readings to fully appreciate the airtightness of the plot and visual motifs."

Susannah is an editor. During a party at a book fair, she sees a portrait of a woman who is wearing the same red necklace as her. Intrigued, Susannah steps closer to the painting, only to be engulfed by a mysterious light that transports her 100 years back in time! To make matters worse, Kane Wilder, CEO of an IT company, who is convinced Susannah is his brother's mistress, accidentally travels with her!

English publication via Renta!

This is an original story expanded from the STEINS;GATE game, and focusing on the heroine Amane Suzuha. In 2036, a monopoly on time machines has created world peace, but at the cost of human liberty.

Suzuha has followed in her late father's footsteps in fighting alongside the Valkyrie rebellion force to change the world. After the group fails on a major mission, Suzuha has almost no hope left. But then she discovers that her father left something for her: a time machine. Using this, maybe Suzuha will have the power to finally destroy this dystopian society and create a better present and future!

Toshiki is a below average student and often the target of ridicule. After he accidentally runs into a shop sign and breaks it, he enters the shop and finds out it will sell him abilities.. But these abilities don't come cheap.

Alternative world where Japanese culture kept its ground to this day and further. Protagonist, a female entertainer typical to Japanese traditional customs, finds herself swept into the world oh so familiar, and yet so different from the one she lived in so far.... a world where she has to fight to survive.

Shishigami Takashi has, for a long time, met with murder cases wherever he goes, that’s how he got the nickname; the "Shinigami" detective. 、 Shishigami, his wife Michiru, and his kouhai Seki, take a trip to an onsen. However, as soon as they arrive, a corpse is discovered...?! Aside from the titular story, two more mysteries are collected into 1 volume!!

There is a rumor going around about a CD called “Trigger” that can supposedly increase the intelligence of its listener. However, the CD has also been connected to several deaths and disappearances. Chitose’s best friend Hayato has also listened to that CD, and not long after, Hayato and his whole family suddenly disappears. Refusing to believe that Hayato is gone forever, Chitose becomes determined to find his best friend and reveal the truth behind the CD.

From: The Zero Alliance