Based on the Idolmaster Dearly Stars DS game.

Ryou has always had a problem with his feminine appearance. As a child he was often mistaken as a girl, and to his disappointment, that didn't change even after he got to high school. One day he came up with his best idea yet for gaining masculinity; he decided to become a male idol!

His cousin Ritsuko worked in the idol industry, so she was able to get him an audition. Unfortunately for his master plan, the company decided that he would make a wonderful female idol. Now, to even have a chance at becoming a male idol, he must first become successful as a girl!

From Chibi Manga:

She loved a teacher. But that kind of love is forbidden! Still she kept love him, and didn't care about it.

One day, she met a boy in white clothes in the greenhouse of the school. She saw his kind eyes and she smelled the odor of wood coming from him. For the first time, Tsugumi felt her heart beating for someone.

But after that encounter she understood that this guy was her teacher...!!

Collection of short stories about married couples.

From Blue Flor:
House 1・ Somei Family
Despite being friends since childhood, there are many things that the husband does not understand about his wife.

House 2・ Kojima Family
A prince in a swimsuit creates a whirlwind romance, and happiness and various insecurities ensue.

House 3・ Takahashi Family
An orphaned exam student is flabbergasted at his older sister's pregnancy and even more so when he learns who the father is.

House 4・ Yano Family
A young widower reminices about his small wife, their relationship and married life.

House 5・ Shimaoka Family

House 6・ Fuyuki Family

Signs of Early Spring

From DrCoke at MangaHelpers:

Even after one month of transferring to a new school, Natsuki keeps her distance from her classmates. Her childhood friend Haruka always tries to push her to be more sociable, but Natsuki just pushes her away. One day, while Natsuki was skipping class and eating lunch on the school balcony, a slime-like substance drops right on top of her. The slime slowly forms itself into... a human girl? An odd relationship between Natsuki and her new alien(?) sister Aoi begins.

Can't find a way to break up with your boyfriend/girlfriend? These people will do it for you.

Kashiwagi has a special ability. When she touches someone, she can see their future romance. But Kashiwagi doesn't know anything about romance herself and can't determine whether the scenes she sees are happy or sad endings. Kashiwagi works at a cafe, known as the "break-up cafe", managed by Sano and in which Konno works as clerk.

From JShoujo Scans:

"I absolutely won't fall for this brat!"

Due to job transfers, Makoto has no choice but to stay at the home of her father's friend for the time being. But there lives a boy who makes her boiling mad!? Turns out he's the king of popularity at school, but he's a prankster who likes to mess with Makoto, and even recently dumped one of Makoto's good friends! How is Makoto supposed to handle this obnoxious brat!?

Midway through the Twenty-first century, an integrated global computer network manages much of the world’s affairs. A proposed major software upgrade—an artificial intelligence—will give the system an unprecedented degree of independent decision-making power, but serious questions are raised in regard to how much control can safely be given to a non-human intelligence. In order to more fully assess the system, a new space-station habitat—a world in miniature—is developed for deployment of the fully operational system, named Spartacus. This mini-world can then be “attacked” in a series of escalating tests to assess the system’s responses and capabilities. If Spartacus gets out of hand, the system can be shut down and the station destroyed . . . unless Spartacus decides to take matters into its own hands and take the fight to Earth.

• Adapted from James P. Hogan’s classic science-fiction novel by the award-winning Yukinobu Hoshino, The Two Faces of Tomorrow is hardcore science-fiction manga at its best.

From Midnight Scans:

1. Akuma na Kuchibiru
Hana Yamada, a high school girl, gets sick during a mixer, and is rescued by a very cool male guy, who was casually passing by. However, when he suddenly asks her if she's an elementary student, Hana becomes very angry and kicks him, before running away. The next day, when Hana goes to the nurse's office, she finds none other than the very boy who'd made her angry, Shuuji Kidou...

2. Shoakuma Drops

3. Eien no Hidamari

4. Katekyo

5. Motto Agetai?!

Atogaki (Omake)

from Renta!

Every day in Japan, 2500 people die due to any number of causes. Do you think you'll be one of the ones to die? No, of course not. Do you think you'll win the lottery? You'd like to think so, we all would. But Sumida is different. He wants the status quo to remain in every way; live a normal life, get a normal job, have normal kids, never to be anyone fortunate or unfortunate, content in normalcy. Anyone who doesn't agree is foolish, doomed to live their life scraping up a mountain that they can never conquer, fated to die in despair wishing things had been better.

When his mother kicks his father out of the house and onto the streets, he thinks he'll be fine. When his mother leaves him to live with her boyfriend, he makes the best of it. When he realizes that he's no longer average, he strives to make his life worthwhile the only way he knows how. When the demons in the back of his mind speak to him, he tries his best to ignore them.

In the manga publication industry, there is a legend:

If you leave a message on a bulletin board in the train station at Shibuya, you can obtain the services of a certain man ... No, not City H*nter. Comic Master J -- an assistant mangaka who can instantly complete any publication manuscript in any art style for the price of 5 million Yen. However, he refuses to work on manga without a "soul."

But what is J's true identity? Why does he wear an overcoat lined with pens and rulers? Is his real name B*ack Jack? And for what reason does a man of such artistic talent choose to live in the shadows of the industry, rather than working on a manga of his own creation?
J's past and his relationship with the mysterious organization "CLUB" may tie in with a secret war for the fate of human culture as we know it ...

K, a robot detective, joins the Tokyo Metropolitan Police Force’s Science Division and is partnered with human partner, Shinjo Go much to the chagrin of Chief Inspector Shiba Daizo, who distrusts the Robot. Together they battle the crimes perpetrated by the renegade conglomerate R.R.K.K. “BADO” (Robot Rental Kabushiki Kaisha – Robot Rental Company)

The ever lasting war between good and evil rages on..or at least that's what he was lead to believe!A young boy becomes the prize for which the legions of heaven clash with the hordes of hell.Being deceived by God and prosecuted by Satan,Malei Damakotto bears the burden of power that could be a grand asset or a terrible scourge for either one!Malei will stand against a fate predetermined by the self proclaimed lords of this world and bend both the will of light and malice of darkness under his fist!Wings shall break and claws shall shatter as he enters the battle of battles on his own right!

The story starts off on a deserted island with a woman shouting "I ain't a chick!" while being chased by 100 male perverts in underwear!!!
Then it cuts back several hours earlier and we get to see how 'she' got into this situation.

It's a desperate struggle of survival on a deserted island between this woman and the different groups of men who are pitted against her, some of whom might turn out to be allies.

Meet Eguchi Yoosuke, leader of a high-school Biker Gang AND the school's handicrafts club. Which means he divides his time between fist fights and fancy needlework. And if you think he's weird, wait until you meet the rest of his gang...

Junichi Sasaki joins his school's drama club upon entering high school. However, he soon finds himself dressing up as a girl for his first stage performance.

From Wikipedia :

Two years ago, a pair of idols, Tsubasa Kazanari and Kanade Amō, collectively known as ZweiWing, fought against an alien race known as Noise using armor known as Symphogear. To protect a girl named Hibiki Tachibana, who got severely wounded by the Noise, Kanade sacrificed herself. Two years later, as Tsubasa has fought the Noise alone, Hibiki ends up gaining the same power as Kanade.

Atori and Ruu live at a shrine abandoned by its deity. Ruu can see the chains of attachment that ties a person down, and Atori can cut that chain.

A collection of stories:

1. Koi to Yokubou no Susume
I'm going out with the school's most popular guy. I don't want to be used and thrown out like the rumor say…?
- Chibi Manga

2. Itazura na Ningyo
The love story between two childhood friends and the magical legend of a mermaid who can grant a wish of unrequited love.

3. Koi wa Beniiro
Beniko, an old fashioned high-school girl is suddenly forced to eat lunch with the new teacher in charge, Nomoto-sensei… (Source: Chibi Manga)

4. Kare no Yubisaki
Moemi has a crush on the new guy at school, and she's not afraid to show it. The problem? His family runs a travelling kabuki troupe—and they're leaving town in ten days' time. Can she win him over before he disappears from her life for good?
- Shoujo-Sense

5. Bishoujo Ouji

When there is darkness in your heart, when you want someone to disappear, he will find you and grant your wishes
Shizuku used to being the best at everything, but when a transfer student comes to steal her spotlight, she is overcome with jealousy. Hal, a death god, offers her a bargain“he'll kill three people for her and by kill, he means he'll make it so they never existed. All she has to do is say the word.
But when Shizuku gives in to temptation, there will be consequences!

She's really a mouse...but he thinks she's a tiger!

Cesare Saracino is bent on revenge! He doesn't realize that the woman he forces back to Italy is not the thief, but her identical twin, Milly Lee.

With Cesare watching her every move, the usually mousy Milly struggles to masquerade as her sexy twin. And when desire unexpectedly flares between them, Milly is powerless to refuse Cesare's advances. Will the truth come out in the heat of passion?

English version via Renta!