From Paperdolls Project:

Manga based off the popular otome game of the same name, tells the story of 17 years old Katagiri Kaede that is determined to be a ninja studying in the famous Fujiwara Ninja Training Academy. One Day, Kaede accidentally cast a genjutsu (illusion jutsu) called Mero-mero Jutsu which causes any guy within a range to falls head over heels in love with her! Now, she has to pick one of the guys she charmed to train together so she can pass her ninja exam. Trouble is, the guys she charmed are all popular guys in the academy! What will happened to our heroine from now on...?

Mira peacefully resided in a magical world until a blow to the head caused her to partially remember her previous life in Japan. The protagonists in reincarnation stories always end up having to deal with trouble, which is the last thing she wants. Alas what awaited her was the selection exam for a magic academy and naturally her special cheat ability was discovered then.
A fantastical tale of a reincarnated girl who doesn't want any cheats.

Mashiro is a fangirl of a model named Yuuki. One day, Yuuki transfers to her school and the very first thing she says to him is "I LOVE YOU!" He ignores it as if it is was something normal, and Mashiro repeats it every single day, saying that it isn't enough even to say it everyday. They act like they're a couple although they're not. But will Yuuki's feelings towards Mashiro change?

From Chibi Manga and Phoenix Serenade Scans:
Ai just loves her big brother, Yuzuru. He's so kind, so reliable and so cool! He always protects Ai from trouble and when she cries, he cheers her up! He's the perfect big brother. But, bad things happen soon. Her parents divorce and she and her brother are separated. Now, after nine years, one day, Ai, now 14 years old, finds a tall boy in front of her school. Who is this boy?

The drama club of an all girl high school puts on the play "The Cherry Orchard" by Anton Chekhov.

Also includes an unrelated one-shot called Schoolgirl Princess.

From ShoujoMagic:

1) Lovers Flowers
It is believe that if a couple kisses during the fireworks festival, they will be together forever. In order to make the miraculous legend come true, Hayuri decides to confess. The one she likes is the basketball club’s captain, Hara-sempai. When she goes to see him, holding her letter, the guy who comes out is the basketball member, Konohana, Hayuri’s classmate. With Konohana’s idea, Hayuri becomes the club’s manager. But she gets introduced as Konohana’s girlfriend!?

2) Go Burst ☆ Girl!
Aki once beat her beloved friend Yousuke (whom she likes), in karate. Now he says he doesn't have anything to do with that, so he acts randomly. She feels regretful. Trouble appears, and the kendo's captain wants to go out with her...?!

3) FAKE!!
Saori is able to tell counterfeits, or fakes, from the real articles. She uses this talent to suit her goal of getting back her dead mother's necklace from two men that treated her cruelly after her father's death.

Kyuutarou Horikita is the tall, dark and handsome... cleaning expert of Kurokado High. His classmates find him mysterious mostly because he's hard to get to know. One day in his club's room in the school's oldest building, he stumbles upon a sleeping maiden: transfer student Fumi Nishioka.

With nowhere else to go and having the eyes to see spiritual dirt, Fumi will learn from the cranky Kyuutaro how to rid the school of the grime that attracts spirit-damaging bugs, and how to fight the bugs themselves.

Has she finally found a place she can call home in the large house of Kyuutaro's small family of sweepers? Will her brazen goal of marrying a rich guy disgust or amuse them? And her heart, once it learns the way of purifying cleansing, will it be cleansed in return—in spite of her missing memories and her ever-looming secret?

Note: This three-volume cleaning fantasy powers up and continues in Queen's Quality!

Tomboyish Himeko loves sports and playing with the boys, but longs to be a feminine, gentle girl like her name implies. When it looks like all is lost, suddenly a familiar face gives her a magical hair ribbon that grants Himeko the ability to appear like anyone in the human world in return for being a magical observation subject.

This is a remake of the classic shoujo manga and anime of the early 90's by Mizusawa Megumi.

Turtles. Tachibana Leo, 16 years old, hates that word. Because it reminds him of his childhood when he had to play with Tsuwabuki Tenma, a crazy girl with a huge love for animals. Poor Leo had to go through a lot of things because of Tenma. After studying overseas for 10 years, he comes back to Japan to take revenge on her but 10 years is a long time and a lot of things have changed since then, including Tenma herself.

"It's a blessing that there is a person who listens to my story."
Not an ordinary, but an ordinary romance comic.

This webtoon focuses on Suwan, an ordinary high school girl that just cut ties with her two best friends. While feeling sad and alone under her frequent spot, the Tunnel of Tears, she befriends a blonde costumed gentleman (in a bunny suit) who listens to her troubles and comforts her. She also makes friends with a gal named Miel and her group, while continually doing what she can to comfort and help her friends just the same.

Mitsuru is beautiful, graceful and admired by many people, but she has a weird problem—a single, violent movement against her can get her begging sweetly for more! Her nickname M, also stands for masochistic.

Natsuhiko, is a guy who found out Mitsuru's secret on their first day of senior high school. Even so, he has an equally bad problem—the mere glimpse of his reflection can send him into a flying fit about how beautiful he is! He is nicknamed as N for narcissistic.

They both hope to minimize their chances of being exposed because of their weird behaviors.

From Chibi Manga:

Because she loved drawing and wanted to do something special, she went to a famous art school.
And there she met the handsome and cool guy...

From Stage Storm:

The story starts with a 5-year-old Lynn travelling with her Japanese mother to England to meet her father. On their way there Lynn and her mother get into a tragic car accident in which Lynn’s mother dies. After getting out of the hospital Lynn moves to live in a manor owned by her father who is an English nobleman. The motherless little girl tries to adjust to high society life and get the approval of her elder step sister, Sara, whose mother has also passed away. At first Sara seems cold and distant towards her new younger sister, because she fears that Lynn’s open and cheerful personality will win over the attention of their father as well as the handsome young man who lives nearby, but...

From Divine Sanctuary:
Ever since she was small, Sakurako has always been treated nicely by all the boys she meets. That made her get too full of herself, and one day, she caused a boy to be hurt very badly. If only she can meet him again to apologize and tell him her true feelings...

From Aerandria Scans:

Noriko is caught up in an accident while she is going to her track and field competition. When she opens her eyes, there is the young doctor Shinoda who seems very concerned about her. She is attracted to his child-like smile, but from his lips, she learns a shocking truth - in the accident, Noriko has lost her physical body and what remains is only a brain, stuck in a little black box?!

Note: The side stories in volume 1, 2 & 3 are written in novel format.

From Midnight Scans:

Kureha Mimachi, a 15-year-old girl, has just transferred into Shiritsu Kenhono High School. However, there is something weird about this school, it is actually a school where the Princes and Princesses of the beast-kind go to!

Even though Kureha is human, she is there as a way to help the students lead their lives peacefully with humans and has the role as the "rabbit". Will she be able survive without being eaten by the students? Only time and her hidden bodyguards will be able to answer that...

Meedan Kang is the last living descendant of a powerful witch that placed a curse on the Montrose family many years ago. She's desperate to live a normal life but suddenly two handsome men, with ties to the curse, enter her life with different plans for her. Their presence forces Meedan to confront her family's past and the abilities within herself that she has resisted for so long. As the three of them try to face the curse that binds them all together, a love triangle begins to complicate all of their plans.

Arisue Sei lived as happily as any normal kid would, just him and his mother -- a particularly private woman -- on an outlying island of Okinawa. There were also his friends Toichi and Moichi. The only unusual things about Sei were his sharp instincts and high intelligence. But everything changed when his mother was killed and he was kidnapped by the people of Neo Genesis. Now, six years after the kidnapping, Arisue Sei has returned to Japan with the title of "Doctor" at only the age of 18, and he's not the Sei that his friends remember. There are bodyguards with him who protect him from others who wish to possess his superb intellect. He says he's come back to assist with the research at Rakuhoku University, where Moichi now works, but here is where the door to Sei's secrets just begins to open.

From ShoujoMagic:Ryou has the biggest breasts of any shoujo manga heroine to date! But life isn't any piece of (cheese) cake, because she's constantly being assaulted by perverts who want to cop a feel. The first man who doesn't obsess over her assets turns out to be the first man she ever wants to have obsess over her, though there's something strange about him... One time she's with him, he's a sweet masochist, the next time he's a bold sadist. Which does Ryou like better? The S or the M? She'll have to make a choice, because it turns out that she CAN'T have both. Find out the surprising reason why one face has two personalities!Includes short stories:Volume 1:Gattsuiteke! - It's Unintentional!Chinatsu has liked her guy friend, Shinnosuke, who she fights with allot, for a long time... Will she be able to be together with him when there's another guy confessing his feelings right in front of him?OnlyA sort of prequel about Masaki and Shingo when they were younger, but mostly focuses on Shingo because he's the more troubled one.Volume 2:Prince of SummerNozomi-chan's got two of the school's most popular guys, Ken Tamae and Kaname Yuuki, confessing their love to her at the same time... What's a girl supposed to do when her world is suddenly so confusing? Especially when she used to wish that she could get her hands on one of the two...Volume 3Shiitake - The Mushroom GirlKeiko Shita sees herself as a dark person, and so does everyone around her... But what if that could change? What if the popular boy, Teru Hinata, could change that?

From Tokyopop: Mikako, our over-zealous heroine, has a sister-complex so strong she won't let just any man wed her sister. On an undercover investigation to learn more about the newest bachelor, she ends up moving in with him! Plus the guy is a highschool kid just like her! Mikako's relationship with him starts to grow. What'll happen between Mikako and him?!