From ShoujoMagic:

Altojin, a strong-willed warrior with a mysterious tattoo, was raised on the grassland plains of the country of Chigul in the time of Ghengis Khan. One day, while out hunting with the Imperial Prince Olsbolt, she saves his life from a would-be assassin.

Olsbolt, suspecting that the assassin was sent by Biruge Han, his father and the reigning sovereign of Chigul, kills his father and thereby takes back his former lover who had become his father's wife.

That night, Olsbolt goes to Altojin's home to hide, but while they were away for a moment, her entire family is slaughtered! What will become of the young warrior Altojin and the bold prince Olsbolt? And what mystery lies in Altojin's tattoo? Is it somehow connected to her family's assassination?

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.

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...!!

From MangaHelpers:
Himeji Wakaba is a 5th-year elementary school student, and she has the ability to see things that others can't. They are mostly frightening evil spirits, and they tend to do bad things to people who are close to her. As a result, Wakaba has no friends and rarely smiles. On a couple of occasions, she brings home stray animals, but her parents won't let her keep them. However, they're worried about their sad, creepy daughter, so one day they decide that whatever Wakaba brings home next, they'll let her keep.
The next thing she brings home is a pink monster called "Pupipo," but her parents stand by their decision and let her keep it. No one is quite sure what Pupipo is, but it protects Wakaba from the other things she sees. Pupipo also helps Wakaba make friends with an occult-obsessed transfer student and solve problems with bullying. Wakaba's life is a much better place with her pet pink monster!

1-2) Oboreru Hitomi
Aki is a male escort. He takes on customers from the shop. Miyaji-san is an ordinary salaryman who becomes Aki's client. He told him he thinks he might be gay because seems to be attracted to men lately. Aki suggests that they first start with a kiss, but ends up sleeping with him. He likes Miyaji, so he gives him his number. Then they meet outside the store...
Note: Chapters 2 and 3 were edited into one chapter in the tankoubon.

3) Saitei Kareshi
Tells the story of Aoi and his client Kaneko, an ordinary businessman.

4-6) Hearts
Tells the story of Shou and their manager Hayama.

7) Telephone
A sequel of all three couples.

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.

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.

There is a strange breed of mechanical creatures, aptly called “Machines,” who will, on the condition that their Host never love another person for as long as they live (else the debt will be paid in blood), grant their wielders fortune and prosperity. And where a Host has betrayed his Machine, you are sure to find a member of the mysterious Gari family, wielders and hunters of Machines, in the ensuing carnage…

So it was justifiable when the Gari family was dispatched to Shakunage High School to covertly investigate a brutal murder perpetrated by the spindly hands of a Machine… But it wasn’t so justifiable when Hanare Shizuma, a youth with an agenda of his own, enrolls at the High School soon thereafter, hell-bent on conducting his own investigation – and soon meets the head of the family of hunters, shockingly enough, a girl his own age. But little do either of them know that their encounter will set the cogs of fate spinning rapidly into motion…

The history is about a half japanese, half italian man in New York, who works as a contract killer for the mafia

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 Chibi Manga:

Because she wanted to attend her grandmother's funeral, Miharu returned to her hometown. Over there, she met a strange boy. And then, she'll discover his true form...

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!?

Nobody know where it is, but it's a place that offers shelter to those who hate their lives or are trapped in the labyrinth of their own hearts... a mysterious hotel. Even now, those who are tired of their lives come to stay in the "Kiri no Mori" Hotel...

In 2012, the author released another chapter, not yet included on a volume, as part of the 35th anniversary of Petit Comic.

In her Ay (Aniversary Box - 2013) the author wrote that this work is unfinished.

Collection of short stories:

1. Hajimete, Kudasai.

2. Idol-sama no Okiniiri
Niina is a 3rd rate performer in a school for idols. One day, with all her luck, she manages to hurt the arm of the top of the top idols - Takashiro Asuka. Will her life come to an abrubt end after this mistake, or will it...?
- From Shoujo Sense

3. Ano Natsu Kara Zutto.
"While I went to a certain course, the summer of my third year, by chance I saw the baseball field. And while watching you try to hit the ball, you caught my heart."
"One year later, I've found you again..."

4. Gouriki Ikka no Owarinaki Tousou

5. Kimi no Tonari de Natsumatsuri

6. Kimi no Kokoro ni Kaoridzuke

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!

Includes an unrelated short story called Daijoubu! Koi x Koi (All Safe! Love x Love):
Suzuri gets asked to join the manga club. Excited (because she reads them) she sadly refuses, because she cannot draw them. But that's okay, says senpai, because senpai would rather Suzuri model for them any way.
Getting reeled in, Suzuri agrees happily. But who knew the modeling would get so perverted?! Not to mention, she might actually be starting to develp feeling towards her senpai... What will happen to Suzuri?

Tojikometai no (I Want to Lock You Up) (閉じこめたいの)
From Yuri Project:
In her dreams, Chika can freely confess her love for Mitsuki. But the reality, where she barely manages to talk properly with her classmate, isn’t as kind.

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 ...

A collection of stories:

1. Black Outsider
Amano bumps into his crush Takase for the first time since high school almost 20 years ago. They go out for a drink but, a lovers spat knocks out Amano. When he wakes up he finds himself in high school again!

1.5. BurnOut
Black Outsider extra

2-5. Dorobou to Hatsukoi (A Thief and First Love)
Tachibana Yutaka has a face-to-face encounter with his guilty past when he runs into his high school crush Momoi. But Momoi has a secret too, and has no intention of letting Tachibana run away.

6. Dorobou to Destroyer

6.5. Dorobou to Hatsukoi Extras

"While I went to a certain course, the summer of my third year, by chance I saw the baseball field. And while watching you try to hit the ball, you caught my heart." "One year later, I've found you again..."