From Yen Press:

Welcome to the prestigious Saint Leaf School, where, among other things, the boys are so pretty they give the girls a run for their money! Amidst this bed of flowers exists one Hitomi Sakuragawa, a sweet girl with a not-so-little weight problem, who lives in a nearby apartment owned by her doting older brother. Hitomi also happens to have pretty much the best luck on the planet: Her neighbors are some of the hottest guys in school! But will she need to steel her willpower, cut out the cookies, and slim down before they’ll even give her the time of day? Or will they be charmed by her kindhearted, genuine personality? It won’t be long before Hitomi discovers that the road to a healthy lifestyle is paved with hilarity!

Tachibana Ritsuka is a female second-year high school student who attends Shiko Academy in Shiko Town. She enjoys her school life while living with her mother Maria, but one day, that balance falls into ruin when she discovers several of her attractive male classmate are demons.

A Collection of early stories:

From Covenant of Darkness:

Face, body, and talent, all 3 are what conspires Misako’s love for the star of the basketball club, with a genius ability and super beautiful Urasawa-kun. However, Misako's first and last profession of love in her lifetime was drastically discarded. Strangely, Urusawa-kun decided to model nudely for an art exhibition in hopes to winning a prize because he has an eye for that thing. The lingering affection is banned and the conditions that sends Misako's heart to abide… A romantic comedy treasure?!

From Sura's Place:
Cha Ji-Yyoung is a journalist who makes a terrible mistake and is forced to make amends for his fault. He is forced to crossdress and enter a woman's university to reveal corruptions. His interesting life as a 22-year-old female dancing student begins.

Teppei Arima is a second-year high school student who lost both of his parents in a traffic accident on their way home from a family trip. His grandfather, Isshin Arima, happens to wield the puppet strings in Japan’s vast economy and demands that Teppei becomes his successor as the head of the Arima Group. To prepare for his debut into high society, Teppei enrolls in an elite academy for the scions of the rich and powerful.

First Kurumatani Haruko Long series (no more a simple oneshot)!!! By Alessia-chan: Ruki is an otaku and is in love with a character of manga called Shun-sama! Suddenly she meet a guy that will live in her house due to her mother sudden travelling and that looks exactly the same as Shun-sama! But does this guy is really a prince-like such as Ruki expect?

This is the sequel to Violinist of Hameln. So read that first.

This series takes place in a fantasy world with famous composers' music, magic, friendship and dark secrets. Our main character of this story is a young ambitious, energetic boy named Schel. (Scale, as in the musical term) Because of the general of the MagiCorps saved Schel from a Mozoku (Monsters of this world) he has a dream to become the greatest magician ever. So he travels to the capital Sforzando the magic city and enters the MagiCorps School of Magic. There he meets Great, a violin magical music user, who is also the son of the great hero Hamel, who defeated the Demon King Chestra. As Schel tries to become the greatest magician, he also holds some secrets of his own. But how will Schel survive magic school with so many rivals to compete against?

One day, Toto—a 19-year-old virgin, obsessed with girls' breasts—found lying a naked, pretty girl (perfect breasts included), but who was completely without emotions. She learned to call Toto "master" and Toto named her "Kuu."

Kuu has a golem, which protects her from Toto's... advances. It also appears that Kuu has enemies who are after her for some reason.

Will Toto and Kuu make it in this romantic love comedy with a slight mystery? (Perfect breasts included.)

Kuragehime follows Tsukimi Kurashita, an 18-year-old who moved from Kagoshima to Tokyo to become an illustrator. Tsukimi is a jellyfish otaku who comes to live in a shared bath and toilet, women-only apartment, Amamizukan. Other tenants include fujoshi, NEETs and others who consider fashion their natural enemy, calling themselves "Amars". One day, Tsukimi meets a fashionable and beautiful girl, Kuranosuke Koibuchi, who saves a jellyfish that is about to die at a pet shop. She later discovers that Kuranosuke is merely cross-dressing in order to evade inheritance of his father's occupation as a politician.

Note: Won the Kodansha Manga Award for best shōjo manga in 2010 and was nominated for the 2010 Manga Taishō award.

Lucrezia, a noble vampire, has come to Japan to seek the supreme blood. However, when she encounters a poor shrine maiden named Inori, Lucrezia might have gotten more than she bargained for.

From September Scanlations:

With a father who's a singer, a mother who's a movie star, and an older brother, Shougo, who's the lead vocalist for the super-popular band The Crusherz, Sena Izumi, an otaku college student is the only dull one born into this super famous and talented family. He loves Magical Girl LalaLulu and is working hard to become a mangaka, but one day he winds up appearing in a TV commercial he just can't turn down. There, he's reunited with Ichijou Ryouma, the super-popular young actor he costarred with on a project ten years prior.

We follow the bumpy and funny romance between bubbly Tamoko and the serious Kanji. With Kanji's father running an idol agency, and Tamoko being the daughter of their top-selling idol, Shinju, things get complicated. Tamako must hide the fact she is Shinju's daughter to save public face, and at the same time, she is determined to be Kanji's ideal wife (as was promised when they were little kids). It doesn't help that Tamako's pretty clumsy and poor of domestic chores, but no matter what comes down the road, she's not about to give up!

From Viz: What happens when an all-girls' high school reigning tomboy finds out her school is about to be filled with boys!? Hanabi Oozora is a rambunctious sixteen-year-old tomboy who comes to the rescue of her less assertive friends--sometimes in exchange for food. So what does she do when, all of a sudden, her all-girls' school is about to be integrated with an all-boys' school?! She meets and falls in love--naturally--with one of the three most popular and handsome boys in the Student Council, Yasuaki Garaku! Unfortunately, Yasuaki doesn't care for girls... and when the girls' Student Council clashes head-on with the boys' Student Council, Hanabi steps in to become a member - hoping she'll change Yasuaki's mind!

In one unusual Tokyo high school, education takes a backseat to brawling as warring clubs wreak havoc in the hallways and chaos in the classrooms, all vying to be the baddest team around! Although they often contribute their fair share, only a handful of students serve to stem the tide of violence in this untamed outpost. These are the few, the proud, the powerful: the members of the Juken Club!

From Del Rey:
Cyan is a teenage cat (in cat years!), and when his beloved young master falls ill, the parents abandon Cyan in the basement of a luxurious apartment building. Now Cyan finds himself smack-dab in the middle of the biggest feline territorial battle in Japan.

Wakamatsu Masato lives with his step-sister, Miyuki, whom he does not have blood relationship with. Their father is always working oversea (in fact, he has not appeared in the manga at all...) and left the two of them living by themselves in Toukyou. Miyuki is cute, nice, sensitive and very popular among guys around Masato. Masato has a girlfriend at school whose name is Kajima Miyuki, who is pretty and gentle, the ideal dream of every high school boy. It took years for Masato and his sister to realize whom they love and care most after a lot of events.

This manga was very popular in Japan and was one of the winners of the 1982 Shogakukan Manga Award for shōnen or shōjo manga, along with Adachi's Touch.

From Tokyopop: Goddess Pandora was sent to Earth to collect "gifts" that were spread among humans. She has a nice body that can tempt anyone who looks at her, but when she uses her powers, she shrinks to a young girl's body. The only way to gain her power back is to kiss her reluctant peon, Aoi.

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High schooler Torii plans to get the girl, even if she is his teacher. The teacher plans to grow up and leave behind her basketball-playing youth. In basketball, planning and strategy can win the game, but is that also true for real life?

In this school fantasy story set in the distant future, creatures contaminated by pollution have overtaken the land, forcing humanity to live in isolated mobile cities called Regios. One such city named Zuellni is a self-contained school in which freshman Layfon Alseif has just enrolled. Layfon reluctantly joins the 17th Martial Arts Studies Unit led by the third-year student Nina Antalk and embarks on a series of adventures.

An original side story that focuses more on Nina.