Hikaru Shidou, Umi Ryuuzaki, Fuu Hououji are on a field trip to the Tokyo Tower with their respective schools. The girls are blinded by a flash of light and hear a voice calling for the Legendary Magic Knights to save Cephiro. They fall through the sky into another world, Cephiro. Once there, they meet Master Mage Clef. Clef explains, "In Cephiro, one's will has the ability to change reality for better or worse. The dark fears in people's hearts become monsters, while a well-intended wish can do miracles. One person, the Pillar, whose will is stronger than anyone else's, is responsible for maintaining through her prayers the well-being of Cephiro."

In the first story arc, the current Pillar, Princess Emeraude, has been captured by her high priest, Zagato. The three girls are charged with the task of saving the Princess.

Magic Knight Rayearth follows Hikaru, Fuu and Umi along with their friendly sidekick, Mokona, on their quest to save the mystical planet of Cephiro.

Clover is primarily about a young girl called Sū. In the cyberpunk world that she inhabits, the military conducted a search for gifted children nicknamed "Clovers", who seemingly have the magical ability to manipulate technology. Demonstrations of their powers include teleportation and summoning weapons from thin air.

Classified according to how powerful they are, the children were then tattooed with a symbol of the Clover Project, with the number of leaves on the Clover indicating their power. To date, Sū is the only "4-leaf Clover" discovered. Along with other "Clovers", Sū was imprisoned to prevent her contact with other humans, as the government feared that she might develop feelings and be used as a weapon to jeopardise the country's national security.

Being isolated from the rest of mankind, Sū craves for company, and as for her only wish, she asks to visit "Fairy Park." Her escort is Kazuhiko, an ex-military soldier who has been forced to undertake the task. It is later revealed that Kazuhiko and Sū are connected through their mutual friend Oruha

Sakura is the princess of Clow - and possessor of a mysterious, misunderstood power that promises to change the world. Syaoran is her childhood friend and leader of the archaeological dig that took his father's life. They reside in an alternate reality where whatever you least expect can happen - and does. When Sakura ventures to the dig site to declare her love for Syaoran, a puzzling symbol is uncovered - which triggers a remarkable quest. Now Syaoran embarks upon a desperate journey through other worlds - all in the name of saving Sakura.

The manga takes place after Sakura graduates from Tomoeda Elementary School, in her first year of junior high school. Sakura sees a mysterious dream, and an incident takes place.

An introspective, character-driven series, Tokyo Babylon reads like a manga version of The X-Files. Its story -- a modern-day fantasy -- follows a young onmyouji (spiritual medium) on his quest to protect Tokyo from evil spirits.
Teenaged Subaru Sumeragi is the 13th head of the Sumeragi clan. Together with his twin sister Hokuto and the mysterious veterinarian Seishirou, Subaru travels around Tokyo, calming the ghosts that threaten the city.

Hinata Asahi is a high school student who lives alone with only her teddy bears to keep her company. Her life becomes much more exciting when the handsome Shirou Asou, moves in next door -- not only is he really cute (even if much older), but he's also her new teacher! Hina has a bit of a crush on Asou-sensei, but when the older man seems to take an interest in her as well, is it a forbidden love or something else? (Source: Tokyopop)

Watanuki Kimihiro is haunted by visions of ghosts and spirits. Seemingly by chance, he encounters a mysterious witch named Y?ko, who claims she can help. In desperation, he accepts, but realizes that he's just been tricked into working for Y?ko in order to pay off the cost of her services. Soon he's employed in her little shop- a job which turns out to be nothing like his previous work experience!

Sakura Kinomoto was just an average 4th Grader - loved P.E., hated math - until one day, while looking through her father's library, Sakura found the Clow, an enchanted book designed to hold a set of magical Clow Cards. But when Sakura opened the book, it was empty. Talk about disasters!! Keroberos, the Creature of the Seal, emerged from the cover of the book and told Sakura the cards must be returned to the book. "If the cards aren't in the book, they come to life and do evil!" Kero formed a contract with Sakura making her a Cardcaptor and together with Sakura's best friend, Tomoyo, they embark on a mystical journey to capture all the Clow Cards before the Cards can wreak chaos and destruction

One night, a man named Shuichiro Kudo comes across a tiny angel trapped on a tree branch. He frees her, and in return she offers to grant him a wish. However, Shuichiro is a successful doctor, with a home and everything he needed; he declined the angel's offer. The persistant angel, named Kohaku, refused to give up, stating that "some wishes cannot be fufilled by oneself." After settling in at Shuichiro's home, Kohaku reveals her mission to track down the Angel Master of Wind, Hisui, who has abandoned heaven. That is, if her devil rival and his two catty servants would let her leave long enough to do so...
(Source: ANN)

Many different oneshots published in Newtype Magazine, each involving xxxHOLiC and another CLAMP title.

Kindai Mahjong:
A short gag "series" that Clamp draws in various magazines. This one came from Kindai Mahjong, a gambling magazine. It features a certain blond bishie from Gohou Drug along with a couple of other characters from xxxHOLiC.

From Tokyopop:

Drawing on CLAMP's own personal experiences, The One I Love provides insight both into the creators' own lives, and into the oft-elusive concept of Love itself.

This intimate collection of short stories and essays doesn't skirt issues at the heart of the matter such as insecurity, honesty, distance, independence, age, and - of course - marriage.

This one-volume anthology comprises 12 individual stories, each of which consists of seven pages of manga and two pages of prose.

Akira - who later appears in the CLAMP School Detectives manga series - is a dapper, debonair young thief-for-hire who becomes the object of 5-year-old Utako's affections. (Source: Tokyopop)

To honor CLAMP's 15th anniversary, CLAMP no Kiseki: The Ultimate Collection features full-color pages, exclusive material, 6 pages of new, never-before-seen manga, and limited-edition collectible figures!

From Be With You Scans:
A collection of bittersweet tales of all the different shapes an unrequited love can come in. Why is it so difficult to confess your love? Why is it that another person can affect someone else so strongly? When a powerful man is fickle, he is allowed to be. But if a woman is unfaithful, she is called a tramp. Koi tells the realistic stories of six different women of different ages, and completely different outlooks on life.

Hideki's just like every other guy in the 22nd century. He just wants a good job, a good car, and a sexy robot girlfriend to call his own. Until he lands a job, he'll never be able to afford his own 'Persocom' companion. Hideki's luck changes when he discovers Chi--an adorable but seemingly stupid Persocom--tied up in a pile of trash. His first robot companion turns out to be a lot more responsibility than he expected, and she gets him into quite a few embarrassing situations. It's 'boy-meets-girl' for the cyber age. (Source: Tokyopop)

A new story begins with Watanuki and Yuuko, while guests wishes are granted.
(Source: LuffyNoTomo)

From Clamp no Lumiere:
Murikuri is the story of a popular pig, a pervert santa claus and his high school girlfriend, nice aliens and many more... It does not make sense and I would advise you to not try to understand it. Murikuri is to CLAMP what special halloween is to the Simpsons, a collection of short gags.