Cast: Nihei Tsutomu

When a creature attacks the city, a man with strange powers reluctantly stands to fight... but a shadowy government organization has unfinished business with him.Abara is set in a dystopian world, filled with large structures. The story revolves around creatures known as Gaunas, Gaunas are people who can shape bone like armor and weaponry around themselves through transformation. The transformation begins around the spine and then shapes layered armor. The story focuses on one such Gauna known as Kudou Denji (though he uses Itou Denji as a fake name earlier). 

Tsutomu Nihei returns with another addictive manga (see BLAME!), set in the not-so-distant future (3005 A.D.). It follows a character by the name of Kanoe Zouichi and the mysterious Kanoe Fuyu whose luminous form is integrated into the system of his bike. They are agents sent by a powerful organization to retrieve the human with the ability to resist and transmute the NS5 infection that is spreading across the world, named Yion/Ion Green.However, their mission is delayed by the reckless actions of the Public Health Department's taskforce and the kidnapping of Yion/Ion Green. Will they complete their mission? Where has Yion/Ion Green been taken? The art in BioMega is similar to BLAME!, with its complicated concrete sprawl and ludicrously wide, empty spaces. However, things seem to happen at a more reasonable pace. In this manga, there is emphasis on the swiftness of the attacks made by Zouichi, such as the gun being holstered just before the enemies fall to the ground. Speed is crucial in this manga, unlike in BLAME!, and the plot develops just as quickly.

Killy is a man of few words. He wanders, seemingly endlessly, through a lonely, gargantuan labyrinth of concrete and steel, fighting off cyborgs and other futuristic nightmares, searching only for something called Net Terminal Genes. And he has a very powerful gun, which he uses without hesitation whenever anything resembling danger rears its ugly head. Who is this quiet, violent, determined man and what are these Genes he seeks? The small communities he finds tucked into the crevices of this towering, dystopic ruin hardly give him leads on his treasure, driving him to find larger enclaves of civilization where people can reveal more about the world he lives in and the quarry he seeks.

First issue of a canceled series; collected (in thumbnails) in Blame and So on (Artbook)

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As detective Musubi Susono investigates a series of child kidnappings, her own partner is viciously murdered. But when the investigation takes a brutal turn, she is suddenly confronted by the killer--and his vicious Silicon Creature...Also Include Blame, one-shot prototype for Blame!

A quick one-shot about a man coming across a girl with fairy-like wings whose right arm is trapped through a hole.

Risking his life to ensure humanity's survival, Taniakze Nagate rides out in his silver armour, the Tsugumori! Thousands of years have passed since the Gauna destroyed the Solar System. The enormous seed ship, Sidonia, travels through space while propogating and producing humans. Brought up in the lowest decks of Sidonia, a young man, Tanikaze Nagate, becomes a Guardian trainee, and is authorised to pilot the outdated but historically renowned Tsugumori. The battle with Nagate's life at stake begins now!

Adventure-student Killy in the Cyber school quest…

Features the character of Blame...In a high school setting?!?!

Parody.

The much-awaited sequel to BLAME! follows a man, called a Dismantler, who is in charge of sub-dividing the nexus towers that incurr Safeguard interference upon its detection of humans without the net terminal genes. Although humans are once again able to reside in the Net sphere, the Safeguard are still a threat. The Dismantler or NSE, or Net sphere engineer, goes on a journey to aid mankind in their survival.

A short oneshot about a man looking for his brother.

[From Kotonoha]:

While it’s not explicitly mentioned in the story, it’s believed that Suzumega is at least somewhat related to Abara since it features the Gaunas.

A bloody war that spans millenniums. Two soldiers set out to kill each other. An encounter that could change their two species’ fate forever.

Collection of Blame-related short stories:

A world blanketed in an endless and ever-growing ocean of snow. The people eke out a living, either huddled around the roots of enormous trees dotting the surface, or high in the canopy, which spreads over the planet's atmosphere.
A chance meeting between Kaina, a youth from the canopy, and Liliha, a young woman from the surface, sets off a chain of events that will change the fate of the world.