From Kotonoha:

Penned by Masaya Hokazono (Inugami, Watashi wa ai) and illustrated by Court Betten (Prince Standard, Harukaze - Bitterpop), Girlfriend features charming and sexy short stories involving romantic relationships between high-schoolers in contemporary Japan.

From MangaHelpers:

Ichinose Kouta is transferring to the academy his grandfather runs. He knows little about it, except for the fact that the students are mostly female, so he imagines that his life will soon become a delightful harem-type story.

When he gets lost on the way to the isolated school, he finds out there's a lot his grandfather didn't tell him. The school is actually an all-girls school for ninja! At first, the girls think he's an intruder, and he barely escapes with his life! Luckily, the misunderstanding is cleared up, and he finds himself under the protection of the beautiful and deadly student council president, Fuyunagi Rindou.

But even now, his life will be anything but uneventful, as he finds himself in the middle of an ongoing conflict between Fuyunagi's student council and another student group, headed by a girl known as Momochi Yayoi. [tethysdust]

Very few people know that one of the country’s leading erotic novel author is 15 year old Akutagawa Taketo that has just entered as a freshman at Hirameki Academy. Unlike regular high schools, this school only accepts those who are accomplished or geniuses in their particular field, ranging from authors like Taketo to mathematicians or musicians. Taketo feels comfortable being in the presence of other brilliant minds but is afraid that his talent might project as him being perverted. Is Taketo going to be able to keep his secret?

From MangaHelpers:
One day, high schooler Nishiura Kenichi was tasked to check if his classmate, Kurama Shion, was still alive. Shion has not shown up to her classes in the past two months, and the teachers were getting worried. When Kenichi arrives at her place, she decides that he would make a good test subject for her recently acquired black magic powers. With her black magic curse, she turns Kenichi into her personal slave.

A funny story about a trio of brothers who run a veterinary clinic and pet-care facility. Follow their every-day (mis)adventures as they learn about love (both romantic and brotherly) and the true meaning of family!

"I fight only for what I believe in...for no one's sake...only for what's deep in my heart. I sail amongst the stars...people call me: Captain Harlock."

Truer words never spoken. Now! Embark upon an adventure into the infinite sea with the last brave souls of humanity aboard the Arcadia!

Story 1: A young woman who fell into a time slip.

Story 2: A group of young people who was hiking get stuck at an old shrine because of bad weather, and one by one they are killed by a moster who was sealed at a cave below the shrine.

Story 3: A group of people met up to tell their own horror stories.

From Fateful Encounters:

The Milkman was born with the body that gets him mixed up in everything, and no matter where he goes, bad luck seems to follow him everywhere. He who gave up fighting destiny, is being yet again bullied by the landlord and yet somehow seems a bit happy. And in front of him, the “man who never gives up” the Coffee Milkman gallantly appears. Their meeting changes destiny?!

A woman runs from her younger brother who is trying to kill her.

Chitose is a cute but absentminded high school student who never actually listens to what people say. Trying to keep him out of trouble are his two friends, Yakushima, who secretly has a crush on Chitose and Haneda, a hot-tempered cook who's determined to keep the gayness to a minimum.

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Chitose never listens to what people say, he always hears something slightly different from what they actually said. Mostly his results are just frustrating, but when his friends, Yakushima and Haneda, get injured and punished because of his inattention, Chitose knows he has to do something. But when he decides to try mind reading, his results are unexpected to say the least.

Hikari is a new shinigami (god of death) at Yomi Castle and is doing her best every day to get used to her onerous duties. Her duties are to manage and fulfill the destinies of humans. The only thing that keeps her going is the kindness of her superior, Commander Ryouma. The akashic records that list human destinies are stored under tight security in the castle. But, when a disastrous event happens among the shinigami, everything changes...

In the far future, humans abandon the devastated Earth and move to the upper world "Tenjo". But Tenjo and the law of causation collapse by a war and humans return to the Earth, which has turned into an inhabitable planet except for the Shinshu area. Shinshu is too small to accommodate all the humans, so they duplicate the area and create "Juso Sekai". In order to rebuild Tenjo and the law of causation, the returned humans start reproduction of history from B.C. 10,000. When the reproduction completes until A.D. 1413, a war breaks out in Shinshu and Juso Sekai falls onto the original world. The humans living in Juso Sekai lose their land and invade the original world. People in Shinshu surrender and is divided by the invaders from Juso Sekai. They try to resume the history reproduction from A.D.1457, but the update of history terminates in A.D.1648. A rumor of apocalypse begins to spread around the world.

This continues the story following Branch A of the PS3 RPG "Drag-on Dragoon 3" (localized as Drakengard). The story follows One and Nero as they attempt to understand the origins of the Red Eye Disease inflicting havoc across the region.

Part of Canna’s volume 20 short project, A Plan for the Delusional Guy.

Love can be obsessive. Like wanting to rip the wings off a butterfly. Chouko has been in love with Taichiro for a long time. Taichiro and Chouko have known each other since childhood. At one point, Taichiro became very candid and told Chouko that he hated her so much that he wanted to kill her. Even so, Chouko's desire toward him never really changed. One day, a senior in her athletics club confessed to her. Filled with burning jealousy, Taichiro also confessed to Chouko. Their insecure, but very obsessive love begins.

An extra prequel can be found inside of Yoru Koi.

"Girlish Delights," by Mitose Noriko, is about a shop full of things that supposedly only girls understand.

From Aerandria Scans:

The heir of the huge Fushiki corporation, Tomoe, comes to Japan as an exchange student. He is his father’s youngest child and on top of that - his mistress’s child, but he was still appointed as heir. There’s danger that people will aim for his life. They attach to him a new maid, with glasses, naturally clumsy and ill-mannered... who turns out to be his new bodyguard, defending Tomoe with her mop!

From Lililicious:
"Girl's End," by Fujio, is about a club for girls who like girls, and the woman who runs it.

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From Viz:

Seventeen-year-old Chiyuki Matsuoka was born with heart problems, and her doctors say she won't live to see the next snow. Touya is an 18-year-old vampire who hates blood and refuses to make the traditional partnership with a human, whose life-giving blood would keep them both alive for a thousand years.