From Chibi Manga:

From the time she was a child, Makoto was always compared to her beautiful sister. So she decided to become just as awesome as her sister for her entrance in High school. But it didn't really work...

One day, she met a guy who's popular and older than her. Suddenly, Makoto can't make her heart stop beating so fast?! So now, she can't stop thinking about her school life!

From Dazzling Scans:

When the masculine and popular-with-the-ladies Ooji Subaru arrives at her new school, her encounter with her childhood friend Megumi and the other four “princes” of the school leads to the discovery of her past life. She is the reincarnated Prince Charming, who was a womanizer who seduced all of the princesses in the land. As a result, a jealous witch placed a curse on him and doomed him to be reincarnated as a woman for eternity. In order to break the spell, Subaru must find the “princess”—now reincarnated as men—who is her one true love!

Stories of Beautiful Fighters from the Queen's Blade franchise made to suffer crushing defeats by various opponents. The events of all these stories are entirely non-canon and left as 'What If' possibilities instead.

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Owl is a demon that consumes people's love. Bored with such an easy task, he finds a challenge from Maria, a girl that only loves god. Can he make her fall in love?

From Nakama:

1-2. Yuukyuu no Kanata
Yuki and Hisakuni are twin brothers. Kanata, their childhood friend, was abused by his father in his own home so is staying with Yuki, Hisakuni, and their grandmother. The three were always close, but after an accident Hisakuni loses sight in one eye. Also after the accident Yuki and Kanata become lovers. Hisakuni tries to hide his love for Kanata and watches over the two but still feels a large gap forming in between them, while Yuki’s love for Kanata begins to grow, it become too large to handle. One day, Hisakuni tries to ask Kanata for the whole story of the accident that cost him his eye, but Kanata pushes him away and runs. A truck is headed toward Kanata, and Yuki and Hisakuni both run to save him. What will be of their tangled fate ---?

3. Yunatama
French Orion washes up on the shore of a small Japanese island with no memories of himself, other than his name. He's taken in by pretty teenager Tooya, and isn't in a hurry to leave. But how did he end up on the island in the first place?

4. Canary

5. Umemomo Sakura

6. Extra

From Girls' Generation Scanlations:

After the death of his older brother, Shima has been left a mansion and a servant according to his older brother's will. There are two things Shima hates most in the world: being bossed around and being restricted. Both of which, his new servant, Haruki, never fails to miss. How will Shima deal with Haruki...?!

Sekina's a rebellious teenager who can't seem to plan ahead more than one day at a time. At school, she's seen as a problematic student in the eyes of her teachers. At home, things aren't going well with her mother who's a single mom. The only place she feels at peace is at Ageo's rock cafe. There, she meets Yanagi. Yanagi understands the pain she carries deep within her, and she finds herself slowly falling for him. One day, Sekina finds herself face to face with Yanagi again... but this time, he's the substitute teacher for her class...?!

2011, Seta Souji moves to the countryside to his uncle's house due to his parents working abroad. Not very friendly, he however managed to make a few friends there, and they all decide to solve the mystery behind the sudden cases of serial murders that strikes the area.

Fubuki, a man with silver hair and black eyebrows, is somewhat of an expert at taking care of people's monster problems, for a price of course. Yoru is a strange orphan girl who runs across one of his fights with a demon cat and insists on becoming his student. The two of them make an amazing team, whether they're fighting monsters or (as happens more often than Yoru would like) running from them!

An infamous delinquent is told that he would die soon unless he dates this girl from another school. From Chibi Manga: If you don't date her, you'll die! That was the prediction made to that delinquent boy, but what will be his destiny...? Read the rest as this manga is under a different name: Inochi Mijikashi, Koi seyo Furyou Shounen!

The story is about conjoined twins, a boy and a girl, and how they - in the wake of the Great Kanto Earthquake of 1923 - come to live with a travelling freak show.
-from Caterpillar

From Antisense Scanslations:

Nene, an orphaned girl who was taken in by a priest, lives under the church's charity, selling matches in town to make ends meet. One day, the priest decides to send her to work as a maid for a local lord. On the road out of town, she is rescued by his nephew, who escorts her to the lord's palace. But it turns out a certain fairy-tale loving demon has taken up shop as the lord, and the priest's motives may be less than altruistic... What will 'Lord' J scheme up for this erotic retelling of The Little Match Girl?

Noriko has led a protected life since she was a child, unable to lead the life of normal kid due to her affluent background. Until an organized school trip to Osaka when she meets Taiyou who eventually changed her life....

From Fantasy Shrine:

As a salesman in the competitive world of beer sales, Sawatari has to gain the approval of the legendary God of Sales, Shino. It’s rumored that whoever has sex with him will improve sales dramatically. Although, Shino is the one who seduces Sawatari, it’s Sawatari who becomes increasingly attracted to Shino, a serious yet down-to-earth businessman with glasses and a wanton in bed without glasses. But could Sawatari fill Shino’s heart with love…?

In the centuries to come, humankind as we know it will be all but extinct. Tiny fairies become the dominant species on Earth. This series of laid-back reports follows one of the few surviving humans, a girl who tries to befriend and study the fairies while also digging up relics of our civilization (CDs, etc) to her great wonderment.

Collection of short stories, many of which seem to have to do with copies/doppelgangers.

Chapter 21, "Schizophrenia," was included in Manga.

A short, wordless, story about a high school boy and his unrequited love.

AnimeNewsNetwork: In the story, Kaoruko runs a small herb shop after losing both of her parents when she was young. One day, a mysterious man dressed in all black enters the shop. Kaoruko is about to discover the true nature of this man named Kaname Hibiki.