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

1. Hen Koi no Specialist

2. Oyasumi Manatsu no Gatsu

3. Koi no Jitsuryoku Ai no Sainou

4. Dokusen Happiness
All Sonoko wants for Christmas is to spend it with her boyfriend. However, it seems that he can’t spare her a few minutes on Christmas, as she’s not his top priority. To make things worse, she’s starting to feel more and more drawn to Takatsuki, a classmate who once confessed his feelings to her…

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 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 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 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...

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.

From MegKF:
A senior high school student, Yi-chen, is a girl's comic lover. She likes to draw girl's comic and share them with her friends who joined the "Comic Association" in the school. Ching-ching, Yi-chan's schoolmate, draws shoujo manga very well, and thinks that "Comic Association" should not necessarily exist because their drawing level is too low. Yi-chan is very angry and bets that she will win Ching-ching in this year's "Manga Competition" otherwise the "Comic Association" will be terminated. At that day, she met a boy, Cheng-yio, who transferred to her class. Although Yi-chan did not agree, Cheng-yo moved in Yi-chan's house by coincidence.

From Intercross:

1. Bokura no Himitsu o Kyouyuu Shiyou ka
Yuka goes to Ikimonogakari's room to ask them to solve her love problem, but unfortunately, they couldn't help her. To make her feel better, the people in the club gives her a piece of candy. Yuka eats it, and she suddenly gets cat ears and a tail! What happened to her? Will she ever go back to normal?

[T/N: Ikimonogakari literally means "(person) in charge of living beings"]

2. Colorful Shounen to Monochrome na Atashi
Naoki and Kiyo have known each other for a long time because they live in the same apartment complex. One Valentine's Day, Kiyo gave Naoki a chocolate cake, but Naoki threw it away and laughed it off. Because of that, Kiyo doesn't make sweets anymore! Because Naoki's dad is Kiyo's dad's boss and they are going on a trip, Kiyo has to make food for Naoki. Will Kiyo re-live the trauma of the past?
(Also included in the Sweets Fortune Telling Anthology as Boy of Macaroon story)

3. Kaibutsu-kun ni Rei
At the Christmas training camp, Yuzuki was paired up with no other than... that guy?!

4. Itoshi no Himeko-chan
Anri, who is usually bad at handling boys, is asked out by the school's most attractive guy, Takuma! This is so she can gradually get used to guys, however, does Takuma have another agenda in play? What is going to happen between the two?

5) Shiro no Kiseki

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...?

1. Ore no Mono ni Nareba Ii
The sweet love between a genius chocolatier and a trouble-making kouhai.

2. Complex Love
Tomoki enters the school's Boy's Beauty Pageant to find out his rival is the "Perfect Prince" Shiratori who says to him, "If I win the pageant, please go out with me!"

3. Makezu Kirai mo Suki no Uchi

4. Kyou Koso Kimi to!

5. Otona no Koi no Kudokikata

From Forbidden Garden:

1) Cream Caramel
Because her parents are transferred away due to their jobs, Mikoto, a grade 11 student, starts living alone on 100,000 yen per month. But the place she lives at is a horribly old apartment... And the one living in the room next to hers is a super cool boy...?!

2) White Summer
Mana and Shou have to go their separate ways after graduation, will they be able to stay together when they're hours apart?

3) There Are Days Like That, Too
Sonomi has been in love with Ikuta-san since she was in the seventh grade, four years before this story takes place. Ikuta-san suddenly starts working at her uncle's cafe, and it seems like Sonomi might have a chance to be his little sister, since he's been going out with another girl for those same four years that she's loved him.