From Shoujo Crusade:

A boy who only loves black and a girl who enjoys all the colors. What will happen when they clash?

Satomi High's Football Club members are bunch of weirdos, there's a former yankee (delinquent), a former Hikikamori, one short-tempered guy and on top of that their captain is a 'chibi' (shorty), who looks more like primary schooler than a 2nd year high schooler, but don't be fooled - despite the fact of being all-freshman brand new team in a brand new high school, those guys made it to the best 4 of Chiba Prefecture last year! Their newest recruit is an almost 2m high guy, who is surprisingly bad at headings (despite having a height advantage). Fortunately the chibi-captain notices his potential as an attacking midfielder... How far can this team possibly go in this year's tournament? (From:MyAnimelist.net)

Masakichi-kun is a first year high schooler working as an errand boy for the upperclassmen bullies. One day he slams into a female member of a biker gang, touching her breasts... She saves him from a falling steel frame from a construction yard and leaves without saying anything... Later on, she suddenly shows up at his school causing a ruckus. What will happen to Masakichi-kun?

Kogane is a socially clueless, glasses-wearing girl who works at a convenience store. She has a huge crush on her manager, Fuuta, but he doesn't seem to return her feelings at all. Luckily, Kogane has a little sister, Akane, who is much more fashion conscious and adept at social situations. Akane is determined to help her awkward big sister get the boy she wants!

From Aerandria Scans:
“Cause trouble in Shibuya, and I’ll hear everything.”
Chiryu Mamoru is the former Shibuya Gang King (Crime Boss). Now he’s protecting the streets of Shibuya as the youngest lawyer in history. With an ear piercing as his lawyer badge and law as his weapon, he works to destroy the nest of evil and to protect the people. Introducing one lawyer’s all consuming fight against heresy!
“You can’t protect anything with violence… that’s why I choose the law!”

The story revolves around Takumi Tsuzuki, a boy who lives with his older "sister" Otome, although the two have no blood ties between them. Otome manages a run-down confectionery store called Stray Cats. One day, Otome picks up a mysterious beautiful girl off the streets.

Mato-chan is a 3rd grade elementary school girl that likes bugs sooo much. Take a look at Mato-chan and friends' daily life!

Mikio teases his neighbor Mariko a flat-chest and she calls him a midget. When one day Mikio turned miniature and ended up in Mariko's care, they discover how wrong they are about each other.

A collection of one-shots:

Vol 1:
Magician
Fairy Tale
Cocona
Plue's Adventures Pt. II

Vol 2:
Bad Boys Song
Magic Party
Christmas Hearts
Fighting Group Mixture

From Intercross:

Hatsune is a useless, devious girl. One day, Hatsune's father decides to make her live with a fastidious boy! Kaede-kun, being fed up with how unladylike Hatsune is, decides to become her tutor.

A sea prince wishes to have Christmas under the sea. Can his butler make his dream come true?

Tomo Fukuya loves taking pictures of himself while cross-dressing, and he's gained some notoriety among his schoolmates because of it. He participates in his school's beauty contest during the school festival against his friend Kei Okabe.

• Nante Zurui Otoko (What a Sly Guy)
Yoshino Nene is a 16-year-old girl who fell in love at first sight with Fukazu-san, a man 9 years older than her. She sends him emails, trespasses (?), and intensely hits on him, but he won't respond to her. Finally, he told her: "I won't ever fall in love". But he looked very sad when he said that. Nene wants to know his real intentions...
- Intercross

• Kimi ni Makasenasai!
After confessing to someone and being rejected, the infamous girly second year, Kaji-senpai who witnessed the whole thing offers to pick Tajima Rika up. And so begins Rika's transformation into a cute girl through Kaji-senpai's hands.

• Come to My Side
Uchino Tomaki, a 17 year old girl, becomes interested in her younger brother's friend, Shun.

• Kimi wo Itadaki!
About a girl who cannot stop feeling the need to compete with her childhood friend. Her uneasy feeling has made her never thought anything other than competing. Then a confession comes for her.

• Wolf Cherry
A girl bumps into a classmate and finds out his secret... He's a shoujo mangaka!

From Neptise Scans:

The story follows Shintaro, the Ganma Army's #1, after he gets stranded on the wacky Papuwa Island.

Nanami transfers to St. Marivel (Mary Bell) High School from America as she looks for her childhood friend, Kotaro. In a school where the ratio of male students to female students is 1:20 respectively, Nanami gets involved in a conflict with a male student who is almost twice her size. As Nanami was about to engage in battle, she catches a glimpse of Kotaro and stops, allowing the male student to grab hold of her! How will she get out of this situation?

Mahjong Oneshot included in the same volume as Death Pie, another longer mahjong manga by Shimamoto Kazuhiko.Related: http://mangapark.com/search?q=death-pie

From Anime New Network: Zushio was to be king and promised his sister that he would become king (on penalty of death). Unfortunately for him, his empire was overthrown and now he's a wanted man. A girl has the misfortune of running into Prince Zushio and becomes tangled in his plight. Adding to her misfortune, Zushio is not quite right in the head, but hey, at least he seems to be immortal.

From Sarang Syrup:

Shin Dong Sun is the new girl in school and the problem seems to be that she’s fat, short, and ugly. She is picked on by her fellow classmates, her childhood friend, Jeh Suh, constantly abuses her, and her only love rejects her! Tired of her intolerable life she attempts to hang herself, but fails when the rope snaps due to her massive weight and there she finds a box full of medicine, and one bottle says that it’ll turn her into however she wants to be…

Special chapter/epilogue is yet to be translated.

From Storm in Heaven:
A short gag manga featuring You Higuri herself. It revolves around her utterly cute, mischievous, and ill-mannered puppy Papi, the Papillon.

17 year old exemplary student Bae Sugu lives alone with his father, the vice principal of his school. Weighed down by his father's expectations, Sugu has to hide his one true passion: swimsuits. He does not know where it comes from, but his passion is pure and genuine - and often misunderstood. But one day, when Sugu is secretly taking pictures of swimsuits by the pool, he is caught by his homeroom teacher who forces him into something ridiculous. Can Sugu find something to get out of the standstill his life has come to? Can his heart beat again? Webtoon from Naver