From Lililicious:

Madoka tells Mayu she likes her and then runs away when Mayu asks her out. Mayu tracks her down and the two of them begin dating, but there's something Madoka isn't telling her...

A collection of stories:

• Priceless Honey (chap 1-2)
Suguri Nagisa, the custodian at an all-boys' school, works at a secret - and quite risque - part-time job. But what happens when a teacher from the school discovers "Call Boy" Nagisa?

• Fine Play
Nanafuji is a regular customer at the cafe where Kaji works at as a waiter. The two became quite friendly when Kaji returned Nanafuji's lost cellphone to him. Kaji told Nanafuji that he had a problem with a stalker and the latter suggested that he should pretend to be Kaji's lover to make the stalker give up on Kaji...

• Yandere Master

• Replay
At his brother's wedding, Fumiya sees Mitsugu for the first time in six years. With their complicated history, and Mitsugu's feelings for Fumiya's brother, they have a lot to hash out.

• Fall in XXX
Both wear glasses, but their personalities are too different. Tadashi's senpai is studying hard to get into Tokyo University to chase after a girl, so they have become classmates at prep school. One night, his senpai invites Tadashi over to help study for the secondary exams. What will Tadashi do with the feelings that he's kept hidden for so long, let they're alone in his senpai's room...

• Back Stage
Sequel to chap 3

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 Doctor's Rule series:

* Vol 1 - Doctor's Rule

• Nakajima is called for backup at the hospital Kurata is working. When they were high school students, Kurata and Nakajima were lovers but Nakajima unilaterally forced a rule on Kurata to not have eye contact with him and he finally ran away from Kurata. On the other hand Nakajima realizes that his disquiet never disappears...

• 2 students of an acting school are working part-time in Kurata's hospital. One aims at getting a wealthy man and Kurata gives him a ticket for a mixer where adult guys who like young boys will gather...

• Because of their battle of ego, rival attorneys play a game where the loser must be a slave...

• Angst between an elite career inspector and a detective under his jurisdiction.

* Vol 2 - Amai Kusuri

Contains two stories:

Chapters 1-3 -- Dokusaisha Granada
Naruse Kunihiko is an upcoming short film-maker who shares the spotlight with no one. He writes his own scripts, his own music, and uses the one-man art of claymation to realize his vision onscreen. An arrogant artist who doesn't tolerate any criticism, he operates solely on the desire for praise. So when he forms a friendship with Nakata, a journalist who has been assigned to interview him, Naruse finds himself unprepared for the trials of a real human relationship...

Chapters 4-5 -- Birthday

From Evil Flowers:

How many doors must you open before you can reach heaven? Is it after the next one, or the one after the next one?

A touching story of a doctor who wanted to help people even though he became a vampire.

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.

From Iskultrip Scans:

In order to restore the Great Dream Tree of Elfland to life, Kiki, a mare, has to eat bad dreams that plague people’s hearts and foster good dreams so that they sleep well. Aided by Gilly, the tree guardian, and the garden elves, she wanders the human world. However, the world is a dangerous place...

Volume 1: Dream Eater
Volume 2: Dream Eater - Saigo no Yume

From Sugar Oasis:

Riria is a middle school girl who is absolutely, hopelessly in love with the guy who lives next door. The only problem is that he is a LOT older than her. His name is Rinpei, and he is 26 and a businessman from a rich family. Although he is nice to Riria, he (rightfully) considers her just a kid, and just treats her like a friend. Poor Riria, she loves Rinpei so much, but he is so much older and doesn't see her as a real woman.
To solve the age problem, Riria transforms herself into a totally different person, trying to make herself look older. Now is the test, she decided to find Rinpei on the street and see if she can fool him with her 'disguise' into considering her a real 'woman' and see how he likes her then. Amazingly enough, things go well. Riria, in her new persona manages to make quite an impression on Rinpei! In fact, he really likes her!

From Intercross:

Aoi has always been the delinquent kind of girl, not taking her future seriously. She's always being compared to her talented older sister, and she's already so fed up with it. As a child, she has always loved the flute, but even then, she gave up because of her lack of self-confidence. While in her secret quiet place, she runs into genius photographer Yohsuke who can hopefully give her the confidence to move on in life.

From Shoujo Manga Maniac:
In a school where students are into different classes based on their grades, there is a prince who is the idol of the school, a cute and shy boy called Renjou Kaoru. Amakawa Yumi, a second year student, doesn't seem to be interested in him though. She's already in love with Kokonoe Yukito, a guy in the same class as her and a childhood friend of Kaoru! What she still doesn't seem to know is that the cute and shy little boy is not actually as he appears to be...

Compilation of short stories:

• Hotel: Since 2079 (2006)
It is the year 2272 A.D.
A computer continues to live on in order to complete a mission in a world where all life, including Mankind, has gone extinct. This is a record of those 27 million years of its heroic struggle.
• Present (2006)
Hanako suffers from a terrible disease. After awakening from a deep slumber, Hanako has only three days to live.
• Subete wa Maguro no Tame datta (It Was All for the Tuna) (2008)
Tuna have become extinct and Jun Shiozaki will do everything possible and imaginable to bring them back.
• Stephanos
Set in modern-day Japan, our main character Noriko finds out that she is pregnant with her lover Matsumura’s baby. He, however, is an important doctor with a family and everything already. Noriko wants to have the baby, but Matsumura says that it’s actually a rapidly growing cancer and that they have to remove it immediately. It might also be neither of these things…
• Diadem
A "Diadem" is a word for 'crown' that has its root in Greek. "Stephanos", which appeared in "Mandala" 01, was also a 'crown'. It seems that we could consider this the second work in a continuing series of shorts that should perhaps be called a "Crown series".

From Aka Roze Tenshi:

Sara is a member of the Heaven Expedition Team, and her job is to hunt Devils, but she hasn't caught even one devil yet and if she doesn't catch one she will be expelled!

She decides to summon a devil so she can catch him, but what will happen when she meets the charming devil Rembrandt?

Also contains:
Midnight
Blooming Love

Following each chapter is a small side story. The fourth side story remains untranslated.

Set in early 20th century France, Claudine...! follows the story of a transgender man into adulthood. He struggles through life, being the first child after three older brothers to take after his father, and is constanly misgendered by those around him. He wants only to be able to find true love...

In the skies above a world analogous to ours in World War II, a dragon flies for the first time since the age of myths, controlled by a human master to whom he owes everything.

Kazuhiko is a black ops agent who is called on an unusual mission: he must escort Sue, an innocent waif who has lived in isolation for years, to an unknown destination. But there is a dark reason for Sue´s life of captivity, and Kazuhiko discovers that his mission is more dangerous than it looks.

Iri and Yukimi have been best friends for two years, and they have something in common--both of them have crushes on two of the coolest guys in school! But they both decide to change that. Iri talks Yukimi into making a game out of it. They'll both do their best to confess their feelings to their crushes and see what happens. But then, Iri begins to make more progress than Yukimi...?

Naruyuki Touya, young student, arrives at Amagiri Gakuen, his new highschool. He finds himself on the quay of the station faced to a robot out of control and is attacked by a girl and then a classmate.
Who are they? How come the girl knows his father?
And what is the connection with him and this highschool?