Set in 2194 AD, China, which is now a prosperous, super-modern country. The characters are mostly reincarnations of warriors from the 3 Kingdoms period. The story begins in Shin Yokohama with main chara Todoroki Ranshirou driving around & causing a ruckus with his bousouzoku called Yokohama Road Stars, when he gets a mysterious package from his father. Soon after he's attacked by Blades and makes an astonishing self-discovery... that he's the reincarnation of Sun Ce!

Sachi lost her parents due to the sudden attack of an alien race called the Gosta. While living in an orphanage of children who suffered the same fate, a girl with no memory, Ai, suddenly appeared. Who is this girl and what is she so afraid of?

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?

From Wikipedia:

An innocent young man, Ikuroo, has a parasite known as Baoh implanted in his brain by an evil organization, Doress. The parasite makes him nearly immortal and gives him the ability to transform into a really powerful beastie when he's in trouble.

Doress intends to use him in some sort of ploy for world domination. But while they're moving him around, a young psychic girl, Sumire (who's also being held by the organization), sets him free, and the two escape together. Of course, Dr. Kasuminome is the mad scientist behind the whole thing, and he isn't about to let his test subject get away... and he has everything from superpowered lackeys to a small army at his disposal.

Hundreds of millions of years ago, highly-advanced beings looking to make a planet for themselves purposefully tampered with Earth's natural processes in order to create multi-cellular life. Watching the planet's evolution closely, they continued to help life evolve further in the hopes of having actual civilization develop.
It's now 1996 in Seoul, where Hyesong, a high-school student, struggles with the usual problems of youth. The only unusual thing about him is that he's been having the same apocalyptic nightmare for an entire month; in the dream he is an great fighter and genius tactician who faces off against a seemingly-unbeatable foe.
Are these dreams not really dreams? Does he really have a role to play in the cosmic balance of the universe? And is the new girl in his class really just a normal student?

From back of book:

He-Sung has dreams of the Earth being destroyed by alien invaders! In these dreams he is a motorcycle-riding warrior, the last defense against the alien armada. By his side is a beautiful armor-clad girl with strange powers and futuristic weaponry. But these are just dreams, and they don't mean anything... right? That's what He-Sung thought... until his mystery dream girl appeared as a new student in his school! But if she is real... can the aliens be far behind?

From Ryuusei no Mafia:

Minnie’s the only human living on an alien planet and because of that she’s rejected by almost all the other inhabitants. Then one day something falls outside of her house and it happens to be... a human prince?!

The protagonist is your average, everyday, Korean school student. That is, if not for his obsession that aliens live on Earth disguised as humans.

Much to his surprise, he was right, the aliens play a game called "Avatar" where they take human form and live human lives. And because of a glitch he caused in their system, now his very life could be at risk.

Now he needs the protection of an Admin of the "Avatar game" or else he could very well die!

Collection of oneshots from 1986 to 1996 by Sugimura Shinichi, including
*Prologue 1 (scanlated)
1. Snow Blind (scanlated)
*Prologue 2 (scanlated)
2. Carnaval 1999
*Prologue 3 (scanlated)
3. Kobayashi-kun (scanlated)
*Prologue 4 (scanlated)
4. OLDK chiku 25 sai
*Prologue 5 (scanlated)
5. BUN BUN BUN
*Prologue 6 (scanlated)
6. Taxi Driver
*Prologue 7 (scanlated)
7. Shoujo Camera (scanlated)
At the beginning of each chapter, there's a humorous prologue with nude-theme.

From Tokyopop:

Daphne in the Brilliant Blue take place in a near future in which the remaining population lives in underwater cities, with waterways as streets. Years ago, while conducting underwater experiments, all contact with the surface was cut off. With the remaining human population now living underwater, The Deep Sea 9 Cities Association represent the last hope of mankind. Ai Mayuzumi is the daughter of the head of the research lab, and is an expert water jet bike driver. When the terrorist group Error, attacks the city, Ai becomes involved with the counter-terrorist group Stelnas, comprised of an all-female team, and led by a girl named Kei, and asks to join them. The group initially resists her efforts to join, but a surprising "gift" that Ai possesses, along with the way she handles herself during a kidnapping attempt, eventually sways the opinion of the members of Stelnas.

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!

Bard is a tough guy involved in a shady business; Sei is a tough kid engaging in some shady dealings. Through sheer stubbornness (and the fact that Sei-kun made a very, very bad hooker), Sei ends up working for Bard, and there's instant attraction.

From Tokyopop:

Hack//4 Koma" is a four-panel (a.k.a. Yonkoma) manga series set in the popular multimedia world of .Hack. Most of the 4 Koma are filled with gags and parodies centering mostly around the main characters of the first (Kite, BlackRose, Helba, etc) and second (Haseo, Atoli, etc) series of ".Hack" videogame

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

The year is 2028, location in New Koshigaya. A young boy, Isurugi Neru, lives in a poor family and is forced to quit school so that he can find his own way in life. Neru on the other hand, only thinks of one thing: to take revenge on Yagami, a classmate, who's especially gifted and has humiliated Neru numerous times.

From Storm in Heaven:

Judges are the messengers of the Central Government, sent out to punish delinquent cities. They have the ability to control programmed "seeds", causing explosive growth. After a disease breaks out among the "Children of Babel", those Judges who're given power through Central's research, Central requires the data of a natural Judge like Sion. However, Central is also interested in the legend of the "Heavenly City", which Sion is named after; what could their true purpose be?

From Tokyopop:

Three years after the popular video game The World was shut down, Tokio Kuryuu cannot wait for The World R:X to come out. Unfortunately for him, he forgets to reserve a copy and finds himself with no access to the game. That is, until a mysterious new transfer student forces him into the game and makes him her servant.

G.U.+ follows the player Haseo, a powerful PKKer known as "The Terror of Death". Haseo is obsessed with an infamous PKer known only as "Tri-Edge" who attacked a close friend of his sometime in the past. The manga details Haseo's search for Tri-Edge, and his eventual inclusion in a mysterious group known as "G.U."


Back story of the ps2 game (same title)
In 2015 a fire at the main CC Corp. building resulted in the loss of a lot of data, and The World was forced to shut down. By splicing in data from what would have been another game, CC Corp was able to rebuild the game system. The next year, "The World R:2" was released, but many old players objected because they were unable to bring over their old characters. However, many new users were drawn in by the new style, and over 12 million copies were sold. Though not a match for the previous version's 20 million users, it became the top-selling netgame on the market." As a result of the new world, four major clans (Kestrel, Lunar Tree, Canard, and Raven) came to power. The clans actions shape 'The World', and most players end up taking one side or another during conflicts.

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.