From Shoujo Crusade:

After breaking up with their respective exes due to certain circumstances, Nono and Kazuma suddenly find themselves in a relationship. How much does it really take to make things work?

From Shoujo-Sense:

Nono (15) dislikes flirty men because of previous experience, so she wants to date a serious, honest guy. When Akkun (25) confesses to her, it's like a dream come true. But does he really love her?

Yu, who passionately love tropical fish. In a new life of highschool, she met a boy who keeps meddling her, Yoshiaki, and his childhood friend, Saori, a girl that can't be honest to her feeling. Aquarium as a trigger, their feeling entangle and cross each other.

Saku Ooyagi returns to his old town after seven years and becomes reacquainted with a childhood friend, the ever-boisterous Mihoshi Akeno; but the reunion is far from merry since his last piece of memory between them is of her falling off a tree and him diving to save her. Regardless, Mihoshi focuses her all into improving their tattered relationship and forces Saku to join her astronomy club.

Basically this manga is about an astronomy club, and slapstick school life comedy as Mihoshi changes Saku's life.

Sequel to Nozo X Kimi. In their second semester of high school, Nozomi and Kimio are in the same class again, still on their quest to help their schoolmates face their own private true-self. Nozo X Kimi migrated from Shonen Sunday S to the much more popular Weekly Shonen Sunday but, instead of being continued from where the previous serialization ended, a second season was started.

A short 11 pages one-shot by Suda Kanon.

Maeda and Sakuma catch each others eyes every now and then. At the last day of school before summer break, they say 'see you later' but it doesn't really end up that way.

From Winter Translations:

It's love at first sight when the princess of industrial development meets the prince of special advance family! A story about first love that gets your heart puzzled and pounding.

Shuuya Inukai is a model student at a high school who one day attracts the attentions of an ojou-sama, Kantori Isuzu, when she realizes that he is bearing, on his forehead, an X-shaped scar...that was also present on her pet dog's forehead...which leads her believe that Shuuya is actually the reincarnation of the said animal. And now Shuuya's days as Isuzu's pet begin.

On the first day of high school, Haruka meets the boy of her dreams but, he was the kind of guy who wouldn't allow anyone to get close. The distance between them does not shrink, even though she wants to get close to him. As a matter of fact, he has a secret that he can't tell to anybody...!?

Lee-Si-Hyun is a friendly normal schoolgirl whose hobby involves a radio program called "The Girl's Teaching Classroom: Viva Love You." She claims to have a mysterious confrontation with an alluring male teacher that she will soon meet. What will this new relationship of theirs become?

Poor Yuzu is an orphan who's too clumsy to hold a job. She's reduced to living in a playground -- until a handsome stranger named Hassaku informs her that she's heir to a fortune, and whisks her into a world of wealth, power, and more hot suitors than she can shake a scepter at! But there's a catch: Hassaku must turn this klutz into a lady of refinement, or Yuzu will lose everything!

Also included in this manga is an extra story called Naughty Honey:
"The boyfriend I made in college cheated on me."

When she caught her boyfriend sleeping with another woman, Kayako Ueno broke his front teeth... and it will cost her a hundred-thousand yen to repair them. So she takes a part-time job as a home tutor-- for playboy Haru-kun.

In the Lovely Lesson series:

Vol.1 - Lovely Lesson
Compared to other girls at your school, do you think you're ugly? No matter what you try, you never become as pretty as them? Or were you dumped because you weren't pretty enough? No matter what the reason, there is a way to heal you. Meet Yuhri, a "beauty healer" who really is just a high school goods storekeeper. But when Yuhri meets another "beauty healer" like her, Makoto, what will she do?

Vol.2 - Chuukyuuhen
The first story is about a girl who is always called fat and ugly by a cute guy. To make him say she is cute, she tries hard to look pretty.

Vol.3 - Hair Make-Up Hen

Nana Namiya is a 17 years old student who along with her mother runs a little old inn in Saitama, Japan. One day she meets a handsome guy named Andrew Anderson, an English boy interested in renting a room.(This manga is meant to be read from left to right)

My Little Robinson is about a girl named Ichigo who struggles to balance her job as a successful magazine model with her life as a normal high school student, and a young man named Tsugumi who is a member of a race of humans who only grow to be about 15 cm tall.

N/A

In modern-day Japan, only the direct descendants of samurai are allowed to carry swords. In Takahara Ibuki's neighbourhood, rumors have been spreading about Shiroyasha - a mysterious swordsman who is said to attack other swordsmen. Many skilled sword-fighters have converged in the city with the hope of hunting down Shiroyasha.

On his way home from school, Ibuki witnesses a fight involving his classmate, Haruma Kokonoe, who is the strongest swordsman in their kendo club. Intrigued by Kokonoe's skill, he tries to discover more about this mysterious student...

Ilegenes is an island internationally known for its prowess in genetic engineering research and technology. But behind the scenes, it is a breeding ground for illegal clones, which are sold for major profits in the black market. After witnessing the death of his parents, young Fon F Littenber joins the Ilegenes Military Academy to rid the island of both its connection to the black market and its tainted name: The Genetic Sodom.

Summary: "If i were to become a guy, then i would never make a girl cry!" Said Jun, who just had a break up with her boyfriend. "Then why not become one?" An old woman told Jun... which startled her. Note: As of December 2011, the series is now being officially published by Oh-no!Manga (in the Philippines) and is not an OEL anymore.

The son of a genius magician, Yoichi Takato has been something of a polymath ever since high school. However, his days are marked by boredom and an inability to open his heart to others. When he happens to join the magic club, he meets with people he thinks he may one day be able to call friends. But then, the curtain rises on a terrifying "murder magic show".

A spin-off story with Hajime Kindaichi’s nemesis from Kindaichi Case Files: “The hellish puppet master,” Yoichi Takato.

From Intercross & Shoujo Crusade:
Yuzu has always been a tomboy so she is worried that other girls will make fun of her underwear during the class trip. Without a second thought she asks her male friend, Ken, to help her chose better lingerie. However, right after this, Yuzu can't understand why she can't act like usual around him anymore.

From Intercross:

"When I'm in the water, I'm not sure whether I'm crying or not."

Rio belongs to the swimming club and is an excellent swimmer. She has even been told by the club adviser to help out Yokoyama, a member who can't swim, because she's good at teaching others how to swim. She is also a close friend to Jun, another swimming club member. What will happen to these three?