3, Street of Mysteries explores the fantastical-poetic vein that has forged Mizuki's reputation in Japan. The stories contained in this series hold in common the obsessive ideas of immortality and of life after death. Skillfully blending a range of black humor, drama, and questions of morality, Mizuki shows once more his profound understanding of the human soul.

(paraphrased from Astiberri)

From Noctis Op.92:
What exactly is the difference between a robot and a human?

In a dystopian future in which robots are becoming increasingly commonplace, a young boy named Hogu lives in near poverty with his grandmother and sister. Though he innately possesses a kind soul, he is ostracized by his classmates and frequently bullied. At the beginning of the story, we find Hogu, friendless and alone - until he meets a robot girl...and our story begins.

Humanity, having faced extinction at the end of the 20th century, would not have entered the new millennium if it weren't for them. In 1969, during their youth, they created a symbol. In 1997, as the coming disaster slowly starts to unfold, that symbol returns. This is the story of a group of boys who try to save the world.

Won the Kodansha Manga Award in the category "Best General Manga" in 2001.
Won the Seiun Award for Best Comic in 2008.

From Anime News Network:

A collection of short stories that look to mankind's exploration of space, and examine the possibilities that we could face when we decide to take those first fateful steps into the unknown.

7 Short Stories About Sex (spanning across 11 chapters):

1-3. 7 Daime no Tomari (The Seventh Generation, Tomari)
Tomari is a cursed woman who must do specific sexual things with her partner or the curse will kill her. Her partner, randomly chosen by the curse, is a guy called Naoki. He's pretty much willing to do whatever she needs, but Tomari will have to get past his incestuous sister Kyoko first.

4-6. Hajimete to,
A teenage couple, Seriko and her boyfriend Ogihiko, find themselves caught in a plot from her crazy yakuza family to make them lose their virginity together.

7. Sandy Go Home
Yoko returns from studying abroad in America with her sex-crazed roommate Sandy, and they both proceed to fight over who gets to have sex with her brother.

8. Mete Yunde
After their parents died in a traffic accident, Morote's two older sisters became insane. Is he safe in the house with them any longer?

9. Pastel Ivory
School kids have a sexual encounter in a bathroom.

10. Ninjia Shoujo Makari Tooru
When a ninja invades a girl's bedroom, he finds himself completely outmatched by her skills, both ninja and erotic.

11. 80D
A couple has a sexual exploit in a library after hours.

After a tragic accident at a large facility 6000 meters below water killed its workers, the facility was abandoned for three years. After the Japanese company owning it is taken over by a Chinese company, the facility will be opened again. Kadokura Kengo and his colleague Danzaki are sent along with the team reopening the underwater facility. However, right away, an 'accident' grievously injures Danzaki. Kengo is left alone with colleagues he doesn't trust in an eerie underwater environment that may have more to it than meets the eye...

A graveyard in contemporary Israel has an unlikely visitor. The elderly gentleman from Japan, a former news correspondent, lays a bouquet of flowers at the tomb of one Adolf Kamil. For he remembers the tale of three Adolfs: Kamil, a Jew who grew up in Kobe, Japan, the son of a baker; Kaufmann, only child of a German consul stationed at that port city and his Japanese wife; and the Fuhrer with whom the Far Eastern nation made common cause.

Won the 10th Kodansha Manga Award for general manga in 1986 (shared with What's Michael?).

Reika Ryuzaki, daughter of the late diamond collector Yoshio Ryuzaki, is a jewel specialist who fights with knuckles branded as "Krishna" in cases involving bad guys who rob or misuse jewels for their own gains. She has an advantage in fighting as she can summon spirits from certain jewels to aid Reika in making her a better combatant in the field.

"I am, in fact, one of the dead."

So says Acony, a rather mischievous girl, upon her first meeting with protagonist Motomi. Newly moved into an ancient apartment, how will Motomi handle Acony and all the bizarre residents?

Abara is set in a dystopian world, filled with large structures. The story revolves around creatures known as Gaunas, those who can shape bone like armor and weaponry around themselves by transforming. 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 early on.

Abara means "ribs" in Japanese.

Volume 2 contains Digimortal
A mercenary in cyber-armor battles a repressive cyborg regime.

If I could describe it in a few words, I’d say “poetic”, “lonely”, and “deliberate”. There’s a touch of the sadness that comes at the end of summer, the transition into cold and quiet. It feels heavy with undertones. Every word seems deliberate and filled with meaning.

Renji is a photography college student., just now living on his own in Tokyo. He sets about seducing a classmate, and then things start to go in direction he didn’t expect.

From Manga-Sketchbook:

After a major natural disaster, earth is slowly transforming into a desert in which mankind tries to survive. Water becomes a precious resource and the center of political intrigues. In the middle of this, a young boy, member of a gang, encounters a beautiful girl who's a merciless warrior and holder of the key to the salvage of humanity.

The metropolitan police have a special squad of negotiators for talking down violent criminals in hostage situations and so forth. The two top negotiators have great knowledge of human psychology and experience in dealing with criminals, but they are missing something important.

They are searching for someone who is capable of agape love-- unconditional and selfless love for all people. Such a person would be able to develop rapport easily with criminals, and therefore be a natural negotiator. Instead of finding a person like this on the police force, they find her in the form of the teenage girl Haruka. Will they be able to persuade her to become a negotiator for the police?

Aflame Inferno is about a self absorbed high schooler, Kang Shichan, that gets caught in the middle of a battle between demons. Injured severely and near death, the demon Inferno merges with the student to save his life. Together they win the battle to discover that they are inescapably joined. The only hope of ever being separate beings is to gather 1,000 Invento Hells and find the right spell of Resurrection. Can Kang Shichan balance hunting down demons with his school work?

Taken from Solaris-SVU:
Ikuru is a boy who doesn't have long to live. Growing up questioning the purpose of his life and the reason for his impending death, he's constantly confused and lonely. After learning that he doesn't have much time left, he requests that a special "girl" called a AGH-RMS (Artificial Genes Human Regenerated for Mental Support) be given to him. These people are genetically made so that they help heal and ease the mental burdens of the terminally ill. This manga is cute, sad, and ultimately a story about life, death, and humanity.

From Kirei Cake:

Aisupe @ is a love comedy story based on the online game “ai sp@ce” that features various well-known heroines from popular games and shows such as D.C. II, CLANNAD, and SHUFFLE!

The story of Garan, a travelling executioner who roams the land, killing bad guys.

Akira Azuma is a tall, attractive, but aloof Kusunoki High School freshman girl and all-around athlete. Hiyori Motohashi is a short Kusunoki freshman girl in the school's broadcasting club. While trying to set up coverage on Akira, Hiyori finds herself attracted to Akira's mysterious charm.

Akira is set in the post-apocalypse Neo-Tokyo of 2030, a vast metropolis built on the ashes of a Tokyo annihilated by an apocalyptic blast of unknown power that triggered World War III. The lives of two streetwise teenage friends, Tetsuo and Kaneda, change forever when dormant paranormal abilities begin to waken in Tetsuo, who becomes a target for a shadowy government operation, a group who will stop at nothing to prevent another catastrophe like that which leveled Tokyo. And at the core of their motivation is a raw, all-consuming fear. A fear of someone or something, of unthinkably monstrous power known only as "Akira".

Note: Won the 1984 Kodansha Manga Award for best general manga, won the Harvey Award for Best American Edition of Foreign Material in 1993 and was nominated for the Harvey for Best Graphic Album of Previously Published Work in 2002.