From Vampire Knights:

Touko is a 15-year-old aspiring actress who can be a bit of a liar. But thanks to one lie, she lands herself in the middle of an audition for a TV drama! A producer she meets there, Kyouichi, sees potential talent in her as an actress! She's found what she wants to do in life, but what kind of future awaits her?!

A girl named Miu stumbles upon a mysterious pawnshop where the only item for trade is time itself! Everyone always searches for extra time, but are they willing to exchange something that is more valuable and irreplaceable — their most precious memories? These memories could be wiped out forever if the borrowed time is not returned. Tokiya, the shop owner, recruits Miu to work part time as a "Time Go-Between." Her new boss is sweet, but he has his own motives regarding the time he trades. And Miu must always remember the most important rule: Never speak of the shop to anyone.

A short and sweet one shot celebrating the birth of love between this girl and her crush.

When Mimii was young, she was friends with Hoshiko. Hoshiko had to go to the United States because she was studying abroad. Mimii makes Hoshiko promise that they will always be friends. And this is where the story starts.

Meca shows up in Mimii's life 7 years later to become her friend, and to help her. However, Meca isn't exactly all that Mimii thought she would be. Meca keeps getting into trouble, saving people's lives, and summoning various people/robots/objects with her cellphone.

A short full color story about a young couple imagining their holidays.

Taken from Wikipedia and Dangerous Pleasure:
After being devastated in the third World War (known as The Third Division), Japan was divided in two. Several years after the end of the war, a crime organization called Vischio has taken control of the destroyed city of Toshima (formerly Tokyo, Japan's capital city), where they are holding a battle game known as "Igura". The main character, a young man named Akira, is falsely accused of a crime. Once arrested, a mysterious woman appears before him, offering him freedom if he agrees to participate in Igura and defeat Igura's strongest man: the king, or "Il-re". The story follows Akira's life in the harsh, lawless Toshima as he fights both to survive and to unravel the mysteries developing around him.

After watching her first ballet performance, Morino Kurumi aspired to become a great ballerina. She entered Hosaka Ballet School and worked towards being the best of her group. Two years after starting ballet, Kurumi is still as eager as ever to become a great ballerina. She meets Hosaka Kazuomi, a young man who further motivates her to become the best. But moving up in this world wasn't so easy, as Kurumi soon gained a great number of problems blocking her goal. From the jealously of her fellow dancers to Kurumi's apparent shortness. Will Kurumi be able to become the great ballerina she has wanted to be?

From Esthétique:

Kosumo has a serious medical condition that has kept her in the hospital ever since she was a child. Since Kosumo's blood type is rare, it impossible to find a donor.
While Kosumo is on the verge of death, out in the city, the 99th Generation Miko, Himiko-sama, gets into a terrible accident while trying to save a child. She is rushed to the hospital, and there her fate crosses with Kosumo's.
When the hospital discovers that Himiko has the same rare blood type as Kosumo, they decide to make her a donor, since Himiko is sure to die as a result of the accident. Kosumo recovers and moves back to Tokyo, but later finds out that Himiko's blood isn't the only thing flowing inside her…

From Operation Boredom:

Jin, son of a Count, has a dark past that follows him everywhere. Now a pirate, he's recently acquired a new set of slaves to sell. However, one of them, Lisa, sparks something inside Jin. Could she be the one to get through his cold, ruthless, and dark heart and see what's really inside him?

From Chibi Manga:

A poor commoner chatterbox accidentally entered the celebrity high school and the unthinkable happened…?

Includes oneshots:
The Female Teacher is 16.
Mouai Idol!! (Blind Love Idol!!)

1-3) Torokeru You na Kiss wo Kanadete
For two years, Neo-chan has been dating the vocalist Gaku. After their first night together, she writes and sings a song which overflows with her feelings for Gaku. After hearing her song, Gaku seeks out Neo’s talent… but when things become serious, a dangerous mood develops. The two then lose connection for 3 months. During that time, Neo finds out that Gaku has a major debut with the song she wrote?!

4) Owaranai Koi o Sasayaite

5) Ban confessions!

From Serenus-Dreamers:

After losing their parents, Fumino and her brother hop from one relative to another. Getting tired of all those moves, she finally decides to quit school and work to support her brother on her own. As they sat on a park bench, her teacher appears in front of her and agrees to her demands of marrying and supporting both her and her brother!! Is he serious or just playing around...?!

--

Also contains the oneshot, Tsukio to Himawari, in vol. 1.
Asahi-kun is a carefree junior-high student, never attaching to girls even though he enjoys going with them. But when the school's number 1 honor student Mitsuki "cyborg" Konno asked him to a 1-month date, in exchange for the front row ticket to his favorite singer's concert, he was forced to accept. He only has to show her what it feels like to date, right? He is ready for that...however, what he's not prepared for was his heart's reaction...

From CMX:

Will a half-mermaid, half-human girl bring an end to the feud between humanity and the mer-people — or bring about the destruction of all life on Earth? As a merman named Shona is returning to his birthplace to spawn, he meets a young human, Jimmy, who suffers from amnesia. Together, Jimmy and Shona set off to find the missing girl. Will they be able to avert a mysterious prophecy, or will finding the secret of Jimmy's identity delay them enough to set Earth on the path to destruction?

Back in elementary school, Alice met a boy who helped her out. Now president of her school, Alice meets a magical sorcerer named Lu who can't go back until the next full moon. All the students in her school dislike her and think that she is not good enough for the presidency. Where is the boy who helped her out..? (taken from VNManga) A oneshot published in 乙女の才能 (Otome no Saino).

N/A

Taking place at the end of the 22nd century Earth, the world is cold and hard. After being wracked with many wars the earth has become infertile, civilized conveniences are controlled by the military, top corporations, and high ranking officials. Most people survive through sheer stubbornness and are surrounded by crime and poverty. The story follows the ex-thief Kotobuki who travels trying to find an honest job so she can leave behind her thieving ways. She's followed by the genius Raimon who used to chase after her when he was a military commander and now has quit to follow his dream of being with her. Constantly interfering in their dream to forget being a thief and ex-militia are people seeking "Tsubasa" the legendary device said to be able to grant wishes. It was said to have appeared a long, long time ago, granted everyone's wishes and then disappeared for parts unknown. Now all types seek it and try to use Kotobuki's and Raimon's skills to achieve it.

From Loyal Kiss:

Guo Guo's father had wished for her to go to college, so when he died, her mother tried to fulfill his dying wish more than ever. As a result, Guo Guo constantly skips school. Lian is the only one who can help her. What will her final answer be?