Original webcomic: http://www.square-enix.com/jp/magazine/ganganonline/comic/idolmaster/
Related:
> THE iDOLM@STER Cinderella Girls Shuffle!! - Cinderwriter♪
> THE iDOLM@STER Cinderella Girls Shuffle!! - Idol wa Hajimemashita
> THE iDOLM@STER Cinderella Girls Shuffle!! - Piyoderera
> THE iDOLM@STER Cinderella Girls Shuffle!! - Rin-chan Lesson!
> THE iDOLM@STER Cinderella Girls Shuffle!! - Uraraka Rhythm

A brooding actor named Seul-Woo and a na?ve country girl named Young-Woo were arranged to be married when they were kids. Now adults, the time for their marriage has arrived. Essentially strangers, the newlyweds must now learn how to deal with living together, clingy exes, betrayal and their own complicated feelings for each other.

Bo-Young is 28 years old and still struggling to finish college because she can’t afford the tuition. After being unceremoniously dumped by the boyfriend she had supported over the years, Bo-Young gets the chance to get herself out of her stagnant life when she accepts a position to pose as a high school student for a year. All she has to do is avoid getting caught.

N/A

This doujinshi is about Madotsuki in Ib’s world. It’s still incomplete, and Rizu publishes a few pages each month

From Shoujo Crusade:
Ten years ago, Mayuki made a promise to Shuu that they would become lovers if it snows on Christmas Eve and since then she has been waiting patiently. Shuu on the other hand seems to have already forgotten about that promise...?

Pairing: Toudou x Makishima x Yusuke
Young Yusuke wakes up in his(?) room only to find an older version of himself having sex with Toudou.

From Evil Flowers:

Yamato, a boy who lives in Shirakami Mountain Village, Aomori; loves festivals. He visits the Tokyo Girls Collection, attracted by its title as “The BIGGEST fashion festival in Japan”. Although he doesn’t have a ticket, he manages to get inside. He encounters a fight between models, and successfully breaks it up. At that time, one person shows up and offers him an opportunity to work as a producer. Will Yamato be able to take advantage of this BIG chance…?!

Tale of a group of School girls who investigate some cases (description based of just 1 chapter)

[From PresenceDear]:
On his first day at a new school, Sakai is given the desk next to Katou. Even though Katou seems a little surly, by the end of the day, the two boys become friends. As time passes, Sakai makes another friend, and then another... But, as Sakai’s popularity increases, Katou’s behavior becomes more and more strange.

A story about Onoda and Deguchi and their growing relationship.
Contents:
1. Soredemo, Yasashii Koi o Suru
2. After 9 Hours
3. After 10 Hours
4-5. Iru no Aru Sekai (The World with Color)
6. Yasashii Uso wa Minorana
Adapted From: Doushitemo Furetakunai

Kali grows up through the deaths of her close ones. Set in a historical-like world with monsters known as "slave ghosts".

“If I thrust a knife through your heart, will you feel my pain?“

A guy loves his (guy) friend. But he knows he’s unworthly for him.
But a desire is a desire nevertheless. And it grows.
http://www.foxtoon.com/challenge/comic/1203

We have dreams from time to time. Dreams of being able to use magic... Magic! If witches were to listen to everyone's wishes, who would listen to the witch's wishes?

Pursued by the mob, a young child seeks the protection of White Dragon, an assassin with the ability to morph into male or female, and kills by using... water...
(from manga updates)

From Blue Flor: A one shot about the intricacies of forming human life.

A collection of short stories:
Le théatre de A
1.Oeufs D’ange - Tenshi no Tamago
A man is asked by a young painter to be her model.
2. Velvet Going Underground
A doll becomes a super idol. Hijinks ensue.
3. Childhood’s End
Alastair runs away and meets the Rabbit.
4. Bite Me Something
Allistaire followed Mr. Rabbit all the way to Wonderland. Will he be able to find him among the crowd?
5. Long Along Alonging
A girl asks a vampire to be his apprentice. But what is her motive?
6. Till Dawn
In a dark tower, a caged voice is singing until a hunted man enters the darkness.
7. Le?on un
Sequel to Long Along Alonging.
8. My Skin on My Back
9. Highland Walker
Sequel to Le?on un.
10. Perfect World
The story of a young wife whose husband is infected with a fatal disease called Flower-Blossomitis.
11. Perfect Lady
Sequel to Perfect World and drawn especially for this book.
12-13. Looks Like a Teaspoon
A boy named Allistaire is often teased at his all-boys school. One night he dresses like a girl and stumbles upon the boy who often bullies him, Simon. Allistaire runs off into a tower and as Simon runs after him, we see the sign “Welcome to Wonderland“ hanging by the tower’s door.
14. The Pearl Blue Story
Do you believe in mermaids? Coggy, a young boy finds a mysterious lady laying down near the shore of the beach. He brings her home to help her.
15. I Am a Piano
A piano tells the story of her life and the people she encounters.
16. Parade
Le théatre de B
1. No?l
A short story about a holiday romance.
2. Teddy Bear Satsujin Jiken (The Teddy Bear Murder Case)
Four murders have taken place at an all girl school. Lying beside each of the victim was a teddy bear with one missing limb.
3. Yonshimai Satsujin Jiken
4. A is for Alice
Alastair, a grown man, is off to follow the Rabbit once again to return to Wonderland.
5. Nedai no Musume Atelier no Musume (The Bedroom Girl, The Sculpture Room Girl)
A story about a girl in her death bed finding another chance in life in the body of a doll.
6. B&W (Black&White)
A story about a boy waiting for his sister.
7. Le Jardin du thé (The Tea Garden)
A mysterious story about a poor young man who orders a kind of tea called Huan Ying – “The Illusion”.
8-9. Free Fitting for Her
A priest and his captured vampire must save a naive and selfish young girl from the murderous desires of a Lolicon. But perhaps this girl isn’t all that she seems.
10. Rose Dusk, Pale Moon
11. Hello, My Sister
12. The Happy Prince
13. Welcome to Wonderland
Simon, Alastair’s old classmate, is now a grown man who bumps into his childhood Wonderland traveller.

From Intercross:
After being instantly rejected by her crush, Takatsuki Yoshino gets seen by her absent-minded classmate, Sakura. Seeing how she seemed sad, Sakura decides to show her some magic tricks to cheer her up. Soon, Yoshino starts to talk more often with him and the two of them get closer... until Yoshino gets a bit... jealous?

Aka and Ine have always lived happily together in the miniature garden. But then, one day, a woman named Azuki appears. What will happen to the bliss that Ine and Aka once shared?

Onii-san has turned into a crocodile! How is his sister, who has a brother complex, going to use love to overcome this forbidden interspecies obstacle?

The absolute last thing Goth-girl Raven and her vampire boyfriend, Alexander, need is another hitch in their nighttime-only romance. But dark trouble hovers on the horizon when they discover that Alexander’s cousin is raiding graves with a motley crew of hooligans! Is there something behind their sudden interest in Dullsville?
A collaboration between Harper Collins and TokyoPop comes a manga based on Ellen’s novel series, Vampire Kisses.

A four different LOVE stories, but have occurred in the same day and that was VALENTINE's DAY. This story is about heart aches, first loves, and people who are still looking for their "Mr.& Ms. Right".

Pairings: Natsuki/Shou, Satsuki/Shou

Synopsis: The beautiful singer Lucille and his orchestra invite you to the city of fear where puppets hunt down humans. The puppets are playing an oratorio of magic and illusions! (Source: Aerandria Scans)

A collection of stories:
V.1 - Bara Datte Kakeru yo
V.2 - Dousousei Daikou
V.3 - Shiawase ni Naritai (I Want to Be Happy)

A man breaks up with his male lover as he enters an arranged marriage.

This manga takes place in a school where the students are based on famous shoguns in Japanese history. Sengoku Gakuen was once like a normal school but Oda Nobunaga, the student president overthrew the teachers and practically made them powerless. He built a school of the students, for the students and by the students. Nobunaga eventually graduated and left Hideyoshi in charge as the student president. However, Hideyoshi soon drops out of school to help Nobunaga rule Japan as he ruled Sengoku Gakuen.

The story picks up here as there is a battle between Ishida Mitsunari, an uptight and conservative, yet hardworking boy, and Tokugawa Ieyasu, the temporary school president who has lots of followers, fighting for the school president seat. We also see other famous figures as fellow students such as Ootani Yoshitsugu who is loyally following Mitsunari and Oichi, Nobunaga’s younger sister. Who will win the student body president position and take command of the school?

A manga based on the Touhou series of games, written by its creator. Mostly focuses on a trio of fairies and the mischief they get up to, as well as the main characters of the games.
The first five chapters have the English subtitle Eastern and Little Nature Deity and were drawn by Matsukura Nemu. Nemu then had to leave the project for health reasons, and it continued for 25 more chapters as Strange and Bright Nature Deity, drawn by Hirasaka Makoto. The series has recently restarted once again under the name Oriental Sacred Place, this time keeping the same artist.

From Gaku Gaku Animal Land:
Seems like Alice and Patchy have been getting pretty naughty with each other lately. But the latest consequences still come as a shock to Alice.

From Gaku Gaku Animal Land:
Something is wrong with Akyuu’s supposedly perfect memory, and she things it’s related to Keine. But what kind of memory would be so problematic?

From Yuha scanlations:
A lone tengu witnesses how a student is getting mugged by a delinquent, but instead of helping, he asks the delinquent to teach him how to be like him. Sunao has always been criticized for being too kind for a tengu, so he decided to search for a human delinquent who could teach him about the ways of evil. Touya tries to refuse at first, but after seeing how naive Sunao is, he can’t bring himself to ignore him.
Color 4-koma.
Pixiv Comic