.hack//Roots is the prequel to the .hack//G.U. videogames. It follows the story of Haseo, a black 'Adept Rogue' (a class that can use multiple weapons) and member of the Twilight Brigade guild. In the year 2015, CC Corp. Building burnt down, and with it, most of its data for The World. By splicing data from what would have potentially been another game, CC Corp. created The World R:2 and released it in 2016. The main revisions of this release were that the game allowed for guild and PvP (player vs player) play.

.hack//Sign follows the story about Tsukasa being mind-trapped into the game. Despite being a "fantasy quest type adventure", it does not rely on action sequences. Instead, the show is driven by mystery, slowly revealing its secrets to the viewer while paying much attention to the individual characters. Questions like what happened to Tsukasa in the real world, who he really is and why he is unable to log out are driving points of the story.

In 1995, all 800 habitants of the isolated Kamikakushi Island vanished in one night, all but a single girl who lost her memory. The cause of the disappearances was never identified. Four years later, that girl, Mari, transfers to a girl's dormitory school, Kaihou Gakuen, leaving behind her grandmother who had been her guardian ever since the incident. There, she meets Hagino. Hagino is the school idol and completes her student council responsibilities flawlessly. The moment she touches Mari's hand, however, Hagino freaks out, straddling atop Mari, hands aroundher throat. Mari is afraid of and angry at Hagino, who pretends as if nothing had happened while in front of other students, but at the same time, somehow, she is attracted to Hagino too. In reality, Hagino is actually an alien who was sent to Earth in order to reconnoiter prior to an invasion. The event on Kamikakushi Island occurred when the 200-member crew of a battleship, the Blue, whose captain was Hagino and the island's inhabitants had killed each other. The Blue was seriously damaged and hidden. Hagino had since blended into human society and continued her reconnaissance. Within her school life, while fighting with fellow students, Mari begins to come out of her shell. Hagino has been living a double life, but her encounter with Mari makes her face human beings, and gradually she begins to have doubts about her mission. While the invasion and war draws closer unnoticed, the girls begin to understand each other.

In a crime-ridden future Japan, Kyohei Tachibana is a peaceful student at a culinary school, dreaming of going to France for advanced study as a patissier (pastry chef). To afford the trip, he accepts a part-time job as private cook to a strange group of women - Sei, Meg, Jo and Amy. To Kyohei's astonishment, they turn out to be a band of violent mercenaries, and he finds himself in the line of fire.

When human beings are being ruled by robots that were created by humans, a girl named Luna appeared. People called her �a bright sun like the moon� She called for help to restore order to the humans. The ruler, Braikingboss was scared of her influence and ordered three of his most powerful robots, Casshern, Dio and Leda to kill her. Eventually she was killed by Casshern. From her secrets, it caused the world to head for damnation. It took a few hundred years to a state where the damage of "damnation" became irrecoverable, robots that were said to live eternally were not able to recover themselves due to rust and corrosion, and death would fall on them. Buildings are not able to keep their structures, most of them would either fall or be deformed, most of the land has changed to deserted wilderness. Meanwhile, Kyuushan who disappeared after the murder of Luna appears, losing his memories, he is not able to remember who he is...

In the near future, personal computers take the form of attractive women and men, called Persocoms (editorial note: "persocoms" actually means PC or personal computer in Japanese). Hideki Motosuwa is a poor student who failed his entrance exams to get into college. So, Hideki is forced to move to the city, get a job, and attend cram school in hopes of passing the next college entrance exam. He, of course, wants a Persocom for himself, but is way too poor to afford one. One day, while passing an alley, he finds a Persocom in a trash heap. However, his new find doesn't seem to be like the others he's heard about. She doesn't seem to have any operating system at all, and only says "Chii". As Hideki learns more about his Persocom (aptly named "Chii"), he finds that she is not of any known type, and most likely some sort of prototype model. He also learns of the rumor of the "Chobits", Persocoms with the ability to think for themselves, instead of running only complex programs. Find out what happens between Hideki and his new Persocom as she learns more about her environment, people, and life.

In the year 2021 AD, the first "Astral Gate" is built in orbit around the Moon; a hyperspace gateway meant to expedite space colonization by making travel between planets a matter of days instead of months or years. This gate is destroyed in an incident that comes to be known as the "Gate Accident"; an explosion that shattered a massive piece of the Moon. Lunar debris began to fall upon the Earth with the same frequency as rain, devastating the planet's surface and killing 4.7 billion people. Fifty years later the human race numbers only 1.5 billion, but has colonized the entire Solar System through the use of perfected Gates.

Renton Thurston is a 14-year-old boy who lived with his mechanic grandfather in a backwater town. Every day he dreamed of being with the mercenary "Light Finding Operation (LFO)" aircraft pilot group "Gekkostate" and riding "Trapar" particle waves-- a sport called "reffing"-- with their charismatic leader Holland, especially when faced with his father's acclaimed past or his grandfather's desire to protect him. When a young girl named Eureka riding the original LFO, the "Nirvash typeZERO", asks his grandfather for a tune-up, she inadvertently brings the attention of the military to the garage; as a result, the garage is destroyed and Renton is forced to deliver a new type of interface-- the "Amita Drive"-- to the Nirvash. After a heated fight in which the Nirvash destroys the military LFOs by unleashing an immense amount of power, Renton is invited into Gekkostate. However, he quickly realizes that behind the facade of a traveling group of mercenaries is a very bitter reality.

Both the manga and the anime follow the trials and tribulations of Across, a self-styled �secret ideological organization,� in its quest to conquer the world and rid it of corruption. Its leader, Lord Ilpalazzo, plans to begin with just one city: Fukuoka, Fukuoka, in the manga and "F City, F Prefecture" in the anime. He justifies this strategy by saying that conquering one city allows leeway for setbacks, and that the people of the world would not be ready for immediate unification. Defending the city are Dr. Kabapu and his Department of City Security, also known as the Municipal Force Daitenzin, a masked fighting force. While the manga and anime both principally revolve around this conflict, each medium features unique subplots. The manga is tightly tied to the main plot and explores the origins and natures of several main characters, especially Kabapu and Ilpalazzo. In contrast, the anime adds a side story mostly independent of the main plot, focusing on the ghost of Pedro (an immigrant construction worker), Nabeshin (the director's alter ego), and That Man, a villain introduced in later episodes.

Edward and Alphonse Elric are two alchemists brothers who search for the legendary Philosopher's Stone, a powerful object which would allow them to recover their bodies (which were lost in an attempt to bring their mother back to life through alchemy). Being born in the village of Resembool from the country of Amestris, the two brothers lived there with their parents. Their father, Hohenheim, left home for unknown reasons and years later, their mother, Trisha Elric, died of a terminal illness leaving the Elric brothers alone. After their mother's death, Edward becomes determined to bring her back through the use of alchemy, an advanced science in which objects can be created from raw materials. They researched Human Transmutation, a forbidden art in which one attempts to create or modify a human being. However, this attempt failed, ultimately resulting in the loss of Edward's left leg and Alphonse's entire body. In a desperate effort to save his brother, Edward sacrificed his right arm to affix his brother's soul to a suit of armor. Some days later, an alchemist named Roy Mustang visits the Elric brothers, and he tells Edward to become a member of the State Military of the country to find a way to recover their bodies. After that, Edward's left leg and right arm are fitted with two sets of automail, a type of advanced prosthetic limb, created for him by his close family friends Winry Rockbell and her grandmother Pinako.

The story of Gundam Wing begins in the year After Colony 195, with the start of "Operation: Meteor," the scientists' plan for revenge against the OZ military organization. The operation involves five young boys who have each been chosen and trained by one of the five rogue scientists, then sent to Earth independently in extremely advanced mobile suits, one designed by each of the scientists, known as "Gundams". Their mobile suits are called Gundams because they are constructed from a rare and astonishingly durable material known as Gundanium alloy, which can only be created in outer space.

The background is in the distant future after the destruction brought about by Armageddon. The war between the vampires and the humans continue to persist. In order to protect the humans from the vampires, Vatican has to rely on other allies to counter the situation. The protagonist, a priest called Peter Abel Nightroad, travels through the countries as a representative for the Vaticans. However, he is also part of "Ax", a special operations group controlled by the Cardinal Catherina. His encounter with a young girl called Esther will determine the struggle and survival between the human race and the vampires.

After venturing into outerspace, humanity have built many planetary cities. Most of these cities were affiliated to the Interstellar Federation, and it became the biggest force in the galaxy. Therefore, people believed that the Age of the Federation would last long. However, the situation changes when a tribe called �Tytania� secedes from the Federation and receives the title of Lord from the Emperor of Vardhana. Tytania obtains a victory over the Federation, and they assert that the Empire cannot exist without them. Tytania puts most of the Federal Territories under its control, and they hold hegemony in the galaxy. Meanwhile, a war begins between Euria and Tytania over their respective rights and interest. From that moment on, the galaxy enters into a tempestuous period.