From Nagareboshi Manga:

Seri is in love with her childhood friend Kou. But he's more interested in her sister! To make things more complicated, Seri's classmate Ikushi is always getting on her nerves... because he likes her sister, too!!

Aotsuki has started working part-time at a cafe, but the boss there is kind of scary. His boss has asked him to help him out with his crush on an employee, the pretty Sonezaki Majiyu. Will Aotsuki be able to set his boss up with her, or will he face the dire consequences of his failure?

Fuuta is an average-looking salaryman who's never had luck with women. However, all that changes when he meets a strange girl through a dating agency. She's nice, but has an odd habit of always wearing masks on their dates. One day, Fuuta sees his mask-wearing girlfriend being attacked by (what he thinks are) thieves. Fuuta saves her from them, and full of happiness and gratitude, the girl confesses and proposes to him. The night they get married, she finally takes off her mask and reveals her identity: She's the super-idol singer Kirari who Fuuta admires! Thus starts their life as a married couple.

From StarryHeaven:
Suzuki Nero has had her eye on Kurokawa Yamato, and according to her love horoscope it was the perfect time to confess! She and Yamato were hitting it off well, although she still had the mean Kurokawa Dan who tries to get her attention in all the wrong ways in the back of her mind. She was ready to confess, but suddenly her chance was ruined! Strangely enough, Kurokawa Yamato and Kurokawa Dan got into a car crash together and when Nero goes to visit Yamato, she finally confesses to him. He kisses her and starts laughing, only to reveal that he’s actually “Dan”!! Nero would have never guessed that the ruthless Dan and the sweet Yamato were actually twins–and twins who had switched identities at that! What’s Nero to do when the personality she likes is Yamato’s, but the real Yamato is pretending to be Dan…!?

Okubo Souka hates girls but what happens when he's paired up with the quiet Magura for class duty?

This is a cowboy shoujo manga set in the Wild West. Miriam is an orphan. Her father was a drunken gambler; she only had one dress and they moved from place to place, until one day her father died and Grace took her in. The series follows Miriam's life, growing up, and falling in love with her life-long friend, the skillful sharpshooter Douglas.

First of the Miriam series (3 volumes), followed by sequels Jikan wo Tomete Matteite (3 volumes) and Sore nari ni Romantic! (1 volume). Seven volumes total.

My Milky Way Railroad is a oneshot sequel to Hoshi no Harmony.

The twins Maria and Noel have always lived together and are very closely linked. When Maria decides to enter Morinomiya School because of the beautiful eyes of its basketball coach, Noel, who refuses to be separated from his sister, decides to enter the same establishment. Unfortunately, there are no spots left for boys. He thus decides to pass himself off as a girl! But school life is not easy when one must constantly play in a comedy! Especially when Noel rapidly falls in love with Miyu, a fellow classmate, while he himself is courted by another student.

Milk is a young and childish girl living with her aunt in Orange Town. One day, she is told that a guest is coming over to stay with them for a while. Milk's aunt had said that the guest is cute and pretty. Milk, excited about her new friend goes to meet the guest at the fountain. Milk's childhood friend Vitamin and others accompany her at this time. Through an unforseen event, Milk arrives late at the fountain with the guest nowhere to be seen. They did however, find a handsome young boy asking for directions to Orange Town.

From VIZ:

Seiji Sawamura is the toughest seventeen-year-old in town, feared by all for his fighting prowess and his deadly "devil's right hand." But at heart, Seiji is a softy, and all he wants is an end to his seventeen-year history of being a lonely single guy. Unfortunately his tough-guy reputation only serves to decrease his popularity with the ladies. But what happens when one day, his right hand becomes a girl?!

Everyone lies when they are young, but the lie Kobayashi Hiro told when he was just six haunts him daily to this day. He claimed that he was abducted by aliens, and, even though it was quickly discovered it was a hoax, thanks to national attention, the town became a hotspot and tourist stop for UFO fanatics.

So when the beautiful Yamada Meteor transfers to Hiro’s school, claiming that she is an alien and Hiro is the only one that can save the planet from destruction, he thinks that the whole thing’s a prank. He quickly learns that she isn’t joking.

Meteor is here to test if humanity is worth saving from the monstrous asteroids headed toward Earth. To prove humanity’s worth to the universe, Hiro must complete the assigned missions, even if they are a little perverted.

Blogger, Shio, meets up with some friends he met online through his blog. He is going to meet Miya (supposedly female), a blogger he hasn't met yet. He is surprised to find out that Miya is a very tall man who has a very calming effect on others.

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!

Compliation of short stories:

• Megane ni Koishite
Yuzuko who loves glasses breaks the class' fearsome Maki-kun's contacts. When he has to wear glasses for the time being, he turns out to be an ideal glasses boy to be loved! Preference = Glasses Crush & Benefit = Can buy new contacts, Maki-kun enters the [Glasses Boy Contest], but Yuzuko...?!

• Yuki no Enbukyoku (Waltz)
Michiru finds out she's the granddaughter of a rich man and her butler is VERY attractive...

• Sekai no Owari ni Dakishimete
A romance set during Pompeii...

• Kawaii Hito
Math teacher, Suruga-sensei has a secret relationship with his student, Kimura Hatoko! However, Yuzuko knows his secret... But is it really what he thinks it is?!

Mashiro and Natsume are childhood friends. Mashiro has a complex about being too tall and 3 years older than Natsume. She has long loved Natsume, but it's difficult for her to convey her feelings to him. A man who looks just like a grown-up Natsume appears before Mashiro. The man who resembles Natsume confesses unexpectedly that he has long loved Mashiro. Who on earth is he?!

4. Atashi no Okiniiri (My Love)
After dating a player who had another girlfriend, Rina decides to become a player also and immediately finds someone willing to be her lifelong toy.

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.

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.

• 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!