Chii-chan is an elementary school student who is really inexperienced with love. When the new transfer student Rei-kun arrives at her school, her life makes big changes. The next day, when Chii-chan arrives at school, her teacher, told Chii-chan that Rei-kun is dead. What will happen to Chii-chan?

From Scum-Scans:

Chocolat is a mature comedy series about half-orphan Tatsumi Chiyoko whose father was caught in huge debt. Now living with Omugi Matsukichi, an ex-underground king who opened a pastry shop, she gets to know people like Katou Ichigo, an ex-inmate. With people after her father's whereabouts, what will happen to her?

Chiyoko is a 4th grader who loves chocolate! Along with her mother and father (who run a patisserie), the daughter of a Japanese sweets shop who sees Chiyoko as her rival, Azuki-chan, and Azuki’s mature little sister Kanoko-chan, she lives everyday happily with a bit of silliness.

Chizumi is a high school student with Fujiomi, who is her senior by one year. However, the story continues on to when Fujiomi goes to college and Chizumi is still in high school. Chizumi is your average clumsy girl and Fujiomi your hot guy, which makes you wonder how the pair fits together. Indeed, many other characters in the story wonder the same thing and do not hesitate to test the limits of this peculiar relationship.
The first volume includes a short story called April Magic.

The series goes over 3 volumes, each with a different name:
1) Haru wo Matsu Koro
2) Pastel Kibun
3) Gin Iro Ehon

In a not-too-distant future, the Earth has been overrun by a horrifying technovirus. Mechanical parasites, mistakenly created in an attempt to advance technology, attach themselves to human spinal cords and turn their hosts into cyborgs.

Desperate to rid themselves of this technological terror, the remaining human survivors must band together and learn to defend themselves against their android enemies.

A four-part manga series depicting the events previous to the American movie Cloverfield (more info in the link). In the manga (more info in the link), a connection is implied between the human protagonist Kishin, his mother, and the creature.

From ShoujoMagic: Suzuki Saya, age 21, is an office lady who's never been able to forget about the guy she liked in middle school. She carries on each day now getting reprimanded by her accomplished supervisor, Tsuge Susumu, and she's not interested in having any romantic relationships... Until out of the blue, Tsuge confesses love to Saya, and brings a new prediction of love for her!?

"Long, long time ago... God descended down to the world engulfed in darkness. With the threads made from sheep's wool, He created one wondrous piece of cloth, gave rise to another world. That world is known as 'Divine Cloth'." This is the legend that was told from generation to generation.

Beneath the Earth of Divine Cloth is the world engulfed in darkness. There lives the creatures that were sealed by God known as Bugs. Frequently, Bugs plunge out from their world, creating holes on Divine Cloth. To fix these holes and reseal the Bugs beneath the ground, a young man and woman, Ryle and Marino, set out on their journey.

"Close Up" follows the story of a guy with a love for anything related to cameras, including media, photography and much more, and his quest to rise it to the top of this industry, and a strange living situation with a girl that seems to be much more well off in this industry to be stuck being his roommate...

From Esthétique:
Exchange students of boy and girl schools, the start of a confusing and sweet life? Qu You Lin, a national Judo champion, and Yan Ya Qiao, honored as a traditional Chinese music genius, were forced to study in each other’s schools. What You Lin faced at the boys’ school, is a shaky Judo club, useless members, and a runaway coach; Ya Qiao, at the girls’ school, although nicknamed Little Prince Xiao Qiao, can he live surrounded by stars? Both like to go back to their schools, but still like to find new possibilities…

New dawn of historical gunfights! A Meiji Era like no one has ever seen before is here!

In a world where monsters called Yoma prey on humans and live among them in disguise, humanity's only hope is a new breed of warrior known as Claymores. Half human, half monster, these silver-eyed slayers possess supernatural strength, but are condemned to fight their savage impulses or lose their humanity completely.

• Clash
A prince at school and at home, Yama is the perfect student. Only when he is alone can he show his true self and his true personality. But, one day, a girl named Saku follows him to his villa and somehow she finds out about his true personality. What will happen now!?

• Extra: Kimi to Iru Kyoushitsu
"When we are together, my heart always tries to tell you; I like you the most...but I am unable to say that aloud, unable to tell because we are just 'good friends'."

Clannad is set in a high-school located in a Japanese town. Tomoya Okazaki is a third-year student who doesn't take his studies seriously. Always late for class, he's seen as a delinquent by the rest of his classmates who are busy preparing for their entrance examinations. Needless to say, he doesn't have too many close friends either.

Tomoya seems not to mind too--until he meets a few other girls from his school. Though he doesn't care much about them at first, he soon opens his heart to them as they get to know each other better.

Clannad is a romantic youth drama that's likely to be more down-to-earth than Key's other works. But like Kanon and Air, Clannad's story is expected to be another touching and heart-breaking weeper.

Based off the game of the same name.

A girl falls for a boy who is a talented pianist who wants to quit, however...

Teti joins the Cirque Arachne, a troupe of acrobats, and finds herself captivated by one member in particular...

From Esthétique:

Kaori was adopted by Hokuto Ryouzou after her grandmother died. She has the power of a shaman or "uta" of Okinawa, whose left eye can see others' future. The Hokuto family owns the "Hokuto Group," the leading movie company in Japan, and Kaori is behind its success. When Hokuto Ryouzou dies, it is written in his will that whichever son of his that Kaori chooses to marry must leave with her and will not be president of the Hokuto Group. Kaori chooses to marry Youhei instead of the one she really loves, Seiya.

Mari, like another Japanese girl, has been invited as a formal guest. She is to be headed to another country to visit her friend who became a queen. When Mari arrives there, things starts to get mysterious as there is an attempt to kill the royal family. Who is behind the plot to kill them?

From Fateful Encounters:

Shin is a top grade student in primary grade 6. In people's eyes, she's always serious. She's a girl with poor taste, who has no interest in fashion. Half threatened by the fashion King in her class, Omone Asahi, Shin entered the Readers' model interview...! Surprisingly, she gave a stunning performance. She begins her journey to become the legendary super-model...

One of the five handsome men in the incredibly popular idol group "Z", Riku, is actually a girl! She's tied with the leader, Touya, for popularity. She pretends to be the type of guy that makes all the girls smile and is extremely cool-looking. However, when she receives a Christmas present from Touya, she decides she wants to show him her feminine side...!?

*Includes a short story called Romantic Shiyo! (Let's Be Romantic!).