Shin Gumiho (Shin meaning "new" and Gumiho meaning "old fox") begins with its origins based on Korean folklore. The 9-tailed demon fox, Gumiho, wishes to change into a human in order to keep her promise to the one she loved. However, right before she turns into a human, a vengeful demon-purger arrives and seals her into a sword. Now, in present day Korea, a young boy has found the sword and its contents. Gumiho is reawakened, but what will she do now?

From Wataame Shoujo:

It's a story about a girl who seeks revenge against the guy who's ads made her want to transfer dorm which later got burned down while at the same time her cellphone and wallet got stolen! She finally got him to compensate by being her maid/servant?!
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A girl received a flower which bloomed into a boy. The boy grew really quickly, to the point that he is now the same age as her...And guess who fell in love with him?
But their relationship somehow become mother/servant.

1-3, 9) Say You Love Me
Akane Ryuuichi loves professor Hasumi Akira's artwork, that's why he became his assistant. But he also loves Professor Hasumi.

4) That's a Blue and Transparent Surprise
Hikari's body produces electricity, so he can't touch anything metal. His childhood friend, Ten, is always taking care of him.

5, 8) Welcome to the Clinic Room
Asashi Keiichi is a middle school doctor. Ichikawa Yuu is his cute and innocent student who has designs on his sensei. Chapter 8 takes place 10 years later when Ichikawa is all grown up.

6) Home
Touri's lover Seiji has been living with him for two years, but sometimes he just takes off for a month at a time.

7) Listen to the Sound of Rain
One rainy day, bookstore owner Yamamoto Fuku shares his umbrella with beautiful high school student Toya Kairi.

I'm Nakabori Ayu, my family runs a fish store on the Fujikubo Kotobuchi Shopping Street. You may be thinking that something like this is merely plain and ordinary, but actually, there's another fish store directly across from mine {Hinai Fresh Fish Store). Our two families compete for business, and the arguments between our fathers are never-ending. Coincidentlly, Hinai Fresh Fish Store's son, Daisuke, is the same age as me. I really wanted to establish a good friendship between the two of us; however it left me with a deep truamatic mental scar...

A collection of oneshots.

Story 1: Funky Prep School
Kobayashi fails to get into her college of choice and decides to take a study course to overcome this failure. There, she meets the man of her dreams, and a man with an afro. How is the study camp going to help her out?
Story 2: An SM Chick Girlfriend
Story 3: Thrust it in More
Story 4: The Hula Dancer of Flames
Story 5:
Story 6: He's a Latin Type
Story 7: The Hage Family
Story 8: My Dear Next-Door Neighbor
Story 9: Dress-up Doll Boyfriend

Note: Shoujomagic only plans to release story 1 and nothing after that.

From xkazemg:

A slapstick/parody loosely based on One Thousand and One nights and other children’s fantasies. Princess Seblan was brought up as a prince to save her life… and she later turns into a real prince and lives happily ever after with his wife. Together with his sometimes-sarcastic magical horse Hendek, Seblan ventures out into the world of fairies, dragons, and other mystical creatures.

Story 1: It's a story about Makoto Nosu and Yusuke Moriyama who have been together for 6 years since junior high school. They are about to finish high school and enter college so they decided to break up since they will be going to different colleges that's far from one another. What happens to their relationship then?

In the southwest area of the Zemulia Continent, one will find the tiny Liberl Kingdom, a small monarchy that has managed to defy all odds against attempts to overcome them during war. Liberl is split into five regions: Rolent, Bose, Ruan, Zeiss, and Grancel. In the city of Rolent, Cassius Bright has raised two children by himself, Estelle and Joshua. He taught them everything they know himself, and encourages them to sign up to become apprentices in the Bracers Guild. Soon after, however, he receives a letter and has to leave on business, leaving Estelle and Joshua to fend for themselves. While working, they receive notice one day that their father's airship has gone missing. With this in mind, the two gear themselves up, and set off to find the ship and save their father. Of course, from there, nothing is at all like it seems. Few things are ever what they first seem to be in Zemulia, in fact.

From Cidsa:
A spaceship lands on a bathhouse which belongs to Kazuto's family. Inside is Princess Warukure (Valkyrie) who gives part of her soul to Kazuto to save him from death (caused by her crash).

Since she only has half of her soul, she turns into her child self. Now Kazuto and company must figure out how to fix the bathhouse and change Warukure back to normal.

Nurunuru Pharmaceutical’s leading product, the Piagra, helps men bring up and maintain their sex drive. To further develop their research, the president of the company has hired a succubus. Known for their sexual drive and ability to manipulate male sexuality, the employees imagine a very foxy woman. But when they see that the succubus is Yamashita Madoka, a young innocent looking girl who is just as pure as she looks, they don’t know what to expect. Will Madoka be able to contribute anything to the company even if she is a virgin?

Story 01: Eye Level -
I'm short. I'm shy. I look like a child. My name is Toshie and I hate my tall classmate, Sakaue. I've got a complex over my height--why does he act like it's nothing for me to worry about??

Story 02: Capture a Bitter Love -
Nagaoka Temari is secretly in love with Yatabe-kun. Even when he speaks to her, she gets so nervous that she can't tell him how she feels. Just hearing his voice sends her brain into a panic. And that's why... she told him the exact opposite of what she's been thinking. Temari knows that she's the reason he's getting failing marks now, so what if her "close friend" Yamaguchi Ai were to tutor him? There's no way for Temari to fool Yatabe into thinking she's someone else... Or is there?

Story 03: Heart Library -
Miyazawa Yuu works in the library. She thinks how nice it would be if she could just talk to the popular Isetani-kun. The other person who's supposed to be working with Yuu today ditched, so now Yuu is stuck being the only one to carry all the books back to the library room. She tries to carry too many and can't see anything in front of her, and when she falls... it's Isetani who catches her in his arms!

Story 04: Baby Spice -
Kawai Machi has a crush on Hiroe, but he completely treats her like a child. And then Machi learns that Hiroe has a girlfriend...!?

From the Animeraider:

Have you ever read a manga and thought to yourself, "Why the hell did he do that? It's not what I would have done. I could do better!" Well, now here's your chance. This manga changes storyline depending upon choices you, the reader, make. Have fun!

In the Docchi mo Docchi series:

V.1 - どっちもどっち Docchi mo Docchi
From their offices high up in a corporate skyscraper, alpha males Ozaki and Tsuburaya make all the ladies swoon. Ozaki's known for his irresistible pheromones, while Tsuburaya's a noble, worldly genius. But when these two rivals end up in bed together, who will come out on top? It's seme versus seme...and much more than pride's on the line!

V.2 - どっちもどっち! ! Docchi mo Docchi!!
At long last, the battle to become top dog - literally - produces a clear victor. But who will it be?

V.3 - どっちもどっち! ! ! ~第三のイケメン~ Docchi mo Docchi!!! - Daisan no Ikemen

V.4 - どっちもどっち！！！～厄介なイケメン～ Docchi mo Docchi!!! - Yakkai na Ikemen

V.5 - どっちもどっち! ! ! ~覚悟のプロポーズ~ Docchi mo docchi!!! - Kakugo no Propose

V.6 - どっちもどっち! ! ! ~ないしょの遊び~ Docchi mo docchi!!! - Naisho no Asobi

Nonaga Hiromasa is an up and coming soccer coach who has made a name for himself for bringing multiple teams from literally nothing to the top in the country. What’s even more impressive is that he just entered high school! He was recruited into his current high school as the new soccer coach, and his observation skills and ability to predict the opponents’ movement make his sole presence enough to win games.

The fact that Hiromasa is going to be coaching at the high school has many top soccer players flocking to this school, but none stand out more to him than Sakamichi Kappo. Not only can Kappo score a goal from half field with his powerful kick, but his ball control is second to none. Initially, Kappo didn’t want to play on a team because he thought no one understood “his soccer style,” but when Hiromasa was able to understand it, Kappo decideds to play for the team. Will the brilliant coach and the talented player be able to take the high school soccer world by storm?

In a school where after school activities are mandatory among all students, Hajime and her friend Sayo come across a new club that they have never seen before. The club is called "The Cultural Activity Preservation Club." The two enter the room to find all kinds of analog jobs and activities, such as handcrafting mats and toothpicks. This is a unique cultural manga mixed with comedy so as not to bore you, this is Double J!

The story follows Erina's route in the Dracu-Riot game. Erina is a foreign vampire from Russia and she is very ecchi, her conversations often involve ecchi stuff which makes Azusa really edgy and Yuuto nervous.

A collection of Dragon Kishidan oneshots and side stories:

One Day, Another Day
Set before the end of the series, it's basically a side story of a day in the Dragon Castle, kind of in Zoma's perspective.

Juuji ni Hikaru Hoshi
Takes place before the events of the actual series. This is a back story that shows how Lykouleon and Raselane met, introducing Lykouleon's uncle, Fieruto.

Mamono no Mori no Kioku
Another backstory that delves a little bit more into the relationship between Bierrez and Cesia before the series started. It also shows how Nadil became the demon lord.

Happiest Children
This actually has three little side stories in it. The first one is about Rune's dream about everyone dressed in drag, the second is about a little adventure that the three dragons go on, and then the third is like a day in the life of Alfeegi, Ri-ma, and Duma.

Crescendo
Backstory about how Lykouleon and Kaistern met and how Kaistern then became the Blue Dragon Officer.

CONFESSION - Thats
This is basically the backstory of Thatz and how he knew about Rath's little secret.

CONFESSION - Rath
Basically telling a lot about Rath, particularly his relationship with Kaister.

A collection of mildly ecchi otokonoko-styled stories focusing on crossdressing high-school boys and the boys who like them, mostly from the men's magazine Oto Nyan. Some of the stories are continued in Hiriajuu Shuudan ga Classmate o Josousasete Kanojo ni Shite Mita.

1-3. Raising Decoy
A boy helps his classmate go undercover in drag to catch subway gropers, and finds that he looks disturbingly good in a dress....

4. Ato no Matsuri (retitled Spilled Milk in the English edition)
A group of male students, having failed to get girlfriends, are becoming desperate; what will these "innocent" boys resort to?

5. Tenshi no Houbutsusen (Parabola)
Baseball-themed romance short.

6. Actress
A boy joins his high school's film club to meet the actress from their amateur film, but gets a surprise...

7. Shishiza no Boku to Natsu no Yozora (retitled Leo and the Night Sky of Summer in the English edition)
The president of the school astronomy club wants to catch UFOs.. maybe some "sexy female alien" costumes will help?

From Day of the River: “The person who killed my father...is among these people.” 15-year-old Kotobuki Ringo reunites with childhood friends she hasn’t seen in eight years since her father passed away: the calm and soft-spoken Shiran, the strong Kujyaku, the kind Masaki, and the energetic Gogyo. They were all students of Ringo’s father and all have amazing abilities of their own. Ringo comes to live with them at Shiran’s villa, but she’s not staying with them just to rekindle their friendship... She believes that one of them may be her father’s murderer, and she will stop at nothing to find out who was behind her father’s death.

From Yuuki Megane Scans:

Shuuhei, Harumi and Daiki start their second year of high school with an absolute goal: Getting at least two new members for their swimming club to keep its position as a club. This is the daily struggles and shenanigans of a high-school boys' swimming club!