From Evil Flowers:

Once upon a time, there was an arrogant ex-prince called Donatian Charles. He decided that he wanted a son to inherit his magical powers, so he kidnapped Adrienne, a girl from the nearby village. Adrienne was, at first, confused by the sudden marriage proposal, but then she gradually fell in love with Donatian Charles. What will become of these two and their stormy engaged life together?

Collection of miscellaneous short stories.

From Tokyopop:

Fujiwara Sunao is a rather unusual young lady. Not only does she prefer to wear her hair short and dress like a boy, but she also possesses the power to control water! One might think Fujiwara would be an odd fit at her school, but strangely, she's not. Between the destructive and demented school president, the kooky and somewhat stalker-like school nurse, and the obsessed underclassman who wants to be her apprentice, Fujiwara may be the sanest person at the school--which is a big help considering she may be asked to save it!

Eitoku High School Freshmen Ganya Sho and his classmate, Ryukawa Yuu, who is also a pretty boy, neither of them can stop quarreling with each other. However, Sho's twin sister has a crush on Ryukawa. A track runner and a film star. How will Sho and Yuu's friendship and dreams progress?

By Kyouria:
After her parents passed away, Eunsu was able to stay at her mother's friend (Ajuhshi's) home. She was about to get attacked as soon as she arrived in Seoul, but was saved just in time by the second son of Ajuhshi. And she later discovers Leewon wasn't at all a caring person...

From AQUA Scans:

Cornered by delinquents, Katanabe Shino was just waiting for her end... until Tachibana-kun, her bad-tempered classmate, saves her. She then decides to give him a not so chaste "thank you gift".

From Dan of Population GO: Based off of The Song of the Nibelungs comes a manga about bravery, honor, and heroism. As the last of his people, Siegfried will stop at nothing until he becomes a legendary knight whose story will last eternity. If his legend lives on forever, then so will the memory of his people...and that is his sole reason for going on. 

Once Demons and Humans were at war, and special warriors were needed to defend humans. Now a peace treaty exists between demons and humans. To uphold it human warriors now protect demons from other predatory demons. The Yosogi family is given this thankless task--and it's heir is young Akira, who can't even stand up against his older sister. But only Akira can sense the presence of demons, so he must become the next Demon Defender. But their grandfather has brought in a shy girl named Matsuri--and Akira is warned in a dream he must protect her at all costs!

Kana loves drawing more than anything. Everyday she goes home to find her mother and brother arguing. Only with her precious art book, does she feel at peace. However, one day her mother throws the art book out. Enraged, Kana leaves home and wanders onto the streets...

1) Candid Love Proposition
Takizawa is constantly being hugged by cute younger classmate Teru. Takizawa's gotten used to the attacks, but why does Teru do it?

2) His Tutor and Him
Yuuichi is Naoto's strict tutor, but also his sweet lover. But why is Yuuichi on a date with such a cute girl?

3) Arduous Love Journey
Takumi is so cute he's always being molested by guys at his all-boys school. Childhood friend Ei-chan loves and protects him, but Takumi has developed a fear of sex!

4) A Mutual Embrace
Identical twins Fuuma and Raiha have a very close relationship, but upperclassman Taiga isn't going to give up on Fuuma. Twincest alert!

5) Take Out Happy
Kazuya is dumped and goes on a drinking binge. When he wakes up, he's in the home of single parent Fumihiko. Kazuya finds himself spending more and more time with Fumihiko and young Shunsuke.

6) Very Very Happy Days
Continuation of Take Out Happy.

When high school student Tsuruta goes in search of a missing cat, he could never have guessed what lies in store for him on the other side of the tunnel...

Collection of short stories:

1. Me and Incredible You
Ishibashi and Ryou have been friends - and lovers - for some time, but suddenly Ryou is thrust into fame and moves to Tokyo. Can their relationship survive the distance both in miles and in popularity? And what will happen when Ishibashi makes a rush decision to go visit Ryou in Tokyo?

2. Even Though the Time When I Dreamed Is Long Past

3. I'm Not Going Back to That Day

4. Bus Stop

5. Rebirth

6. That Day, A Summer Day

7. Oh! We Are the North High Cheering Party
Freshman Harada is in love with his captain Tachikawa. When Tachikawa sees him ****ing his shirt, can Harada ever face him again?

This isn't an ordinary high school—these kids have magical powers! Having the ability to cast a four-dimensional image can bring you fame and fortune, but you've got to be good at it. And that's what goes on every day in this school for "Projectionists." Some, of course, have an easier time at it than others. And sometimes having magical powers just gets in the way of the usual concerns that complicate a teenager's life. This complete in one-volume collection features stories that focus on different members of the student body. Step into this multi-dimensional world with these magical kids and see how each student deals with his or her special gifts! —CMX

Contents:
- The Sky That Enchants You
- Last Platonic Blue
- Little Girl's Close Game
- The World I Create
- Summer Vacation (Bonus Manga)

The super-expensive Joka Gakuen has a policy where the valedictorian, platinum student (PS), is exempt from school fees. Ai supports her large family in place of her parents, so she has little money. She takes Joka Gakuen's entrance exam because she wants to become the PS. Her dream comes true when she gets the top mark, but...

A lifelong dream of fame and fortune has been the driving force of Wataru Jouchi's entire life. Now, after much self-doubt, he's decided to fulfill his destiny and become a voice actor for anime videos. At first, he is thrilled to discover that his long-lost friend, Renji Kazama, is considered a top star in the industry. But Kazama does not seem at all pleased about their unexpected reunion.

-----------

From Youka Nitta, author of Embracing Love. Boku No Koe follows a young voice actor who dreams of making it big in the industry, but when he finally gets his chance he gets cold feet. Surrounded by voice acting legends, he can't help but feel insignificant. Will his seniors take him in and show him everything they know about voice acting -- and love?

Yui is simply a ghost wandering around the beach. She does not know who she is or what happened on "that day." That is, until she meets up with her big sister Yuria who helps fill in the missing pieces...

Oneshot from Yuri Hime Wildrose

This is about two girls who like blue ribbons.

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?

From MangaHelpers:
When an enemy explosion leaves private military soldier Terawaki Ryo nearly dead, a secret organization rebuilds his body using the research they have done in human revivals. Unfortunately for him, the technology only allows him to come back in the form of a teenage girl. His new identity, Shibahara Kyoko, leaves him distraught as his frail body doesn’t allow for the combat skills he used to have or even pick up heavy artillery he used in the combat field. Kyoko is assigned to protect a prestigious academy where daughters of powerful leaders attend since the girls’ presence makes it a hotspot for terrorists to attack and blackmail the people in power. Led by his former commander and mentor, Major Honjo who has also been reborn as Ryo, was a beautiful teenage girl named Chujo Shizuko, and the pair work together as anti-terrorist teenage school girls.

From Chibi Manga:

Wakaba has no memories about her first love… The only thing she keeps from her first love is a matching pendant. One day, the vampire of rumors, Yukito, comes to her school. And he has the same pendant as her?!
Wakaba is sure that Yukito is her first love just after telling him, he kissed her.
But why is he so cold with her after that?!

Besides there are two other side stories:
Un Chocoholic
Bloody Honey