From ShoujoMagic:

1) Teach Me More
On her way home from school, Hina is attacked by a pervert on the train! She's too embarrassed to raise her voice, but - she's saved by Kyousuke!? Kyousuke is the hottest guy around, and there's not a single girl who doesn't want him. He pulls Hina off the train, and then... he does more things to Hina than the pervert on the train would have!
(Also included in Yuuwaku - Sakaraenai Yokubou)

2) A Boy's Suggestion
Kana is on a mission of love. How pathetic would it be if a senior like her completed high school without ever having had a boyfriend? That's when Takuya, a freshman with a reputation as someone you don't want to mess with, confidently asks Kana to go out with him. She has misgivings about him being younger than herself, but can she be adult enough to overlook it?
(Also included in 17-sai Hajimete no H)

3) Lewd Melody, Obscene Fingers
Yurika has grown so used to doing what others tell her to do that she never realized she was like a caged bird. She accepted it as a matter of course when arrangements were made for her to get engaged to Satoshi, her controlling piano teacher. That is until piano genius and fringe element Hibiki teaches Yurika how to put emotion in her music -- how to fly from her cage -- among other less innocent things...
(Also included in Love & Sex)

4) Teach Me More & More - How the Wolf Feels
Continuation of Teach Me More. Hina and Kyousuke finally go on their first real date, and we learn how the wolf feels about his rabbit...

5) Haou Airen Side Story - A Tale of Happier Times
Kurumi's brief dream of happier times with Hakuron.

From Blissful Sin:

1-4) The Devil Smiles
The second son in a family of beauties, Naruse Shouta, is a world-famous hairstylist and model. He constantly showers affection over Ichii Hisashi, the grim but pure-hearted high school student who lives across the street. Due to his self-imposed "Under 18 is Prohibited" rule, Shouta has been impatiently waiting for Hisashi to grow up. However, none too soon, Hisashi's 18th birthday approaches...

The 'Kawaii Akuma' side-story makes its entrance!

5) Tactics

Average high-school student Takahashi wants good luck for the new year so she can get closer to her popular classmate Yoshizawa, but instead her fortune reads "Terrible Luck". What's a poor unlucky girl like her to do?

Chiisaku Furikabutte, lit. “Small Windup”, was published in Afternoon between the tankobon publications of volumes 15 and 16 and during the 2011 hiatus, and it is a series of specials about the lives of Oofuri characters. (Nice Pitching!)

From Antisense Scanslations: "I don't need this ring anyway!" She thought she saw the last of the promise ring from her ex-boyfriend until a water god came out of her bathtub and gave her 3 seconds to answer his question! Because of her sadness she lied to his second question so he takes it upon himself to purify her with his water; tentacle style!

People say first love is the hardest to forget... And it is, at least for Hiroto. As much as he wants to, he just can't get Wataru out of his mind and heart. That guy next door, who is five years older than him, now even has a lover Naoyuki, and clearly is not interested in him. Hiroto has to learn to live with it... and with Wataru as his roommate, forgetting will certainly be the hardest thing to do.

Popular boy Kagami is horrified when his secret is sniffed out by the infamous anime club President, Tsukishima. Tsukishima agrees to keep his secret, as long as he submits to her terms...

Student Council Vice President Harunobu has never fallen in love before. She's dated various people and after recently breaking up with someone, again she finds herself being asked out. Will this girl finally be able to make her feel the heat of love?

Shiba is in love with his kendo senpai, but when he enters university he doesn't want to be in the kendo club anymore. How can shiba convince him to join the club again? And why does annoying Akito senpai have to be in the club instead?

Tsumugui and Shinobima Saguri loved exploring as kids, but Saguri had a weak constitution. When Saguri moved away when both were four, they promised to go exploring when they're older. Couple of years, Saguri moves back, healthy, and ready to explore!

A girl gets impatient when she and her boyfriend haven't kissed yet, even though they've been dating for awhile, so she tries to take matters into her own hands.

Also, there's a oneshot after this about a girl with a similar problem as in the first story with her dating the most popular guy at school who hasn't made any moves on her.

A manager and her coworker get snowed in.

For some reason a collegian Maru needs a new place to stay and ends living with his friend’s bro, a novelist Yohan who complains about his lately insomnia and asks Maru to help him fall asleep. Guess what happens next?

Oneshots focusing on Kanato, Shuu and Reiji from the otome game Diabolik Lovers and a girl, Komori Yui, who goes to live with them.

Yui Komori is a positive-thinking girl who nevertheless is troubled by seeing spirits and experiencing poltergeist phenomena. In her second year in high school, she transfers to a new school — a night school for entertainers and celebrities — due to her father's work. There are rumors that there are vampires among the student body, and Yui ends up living with the Sakamaki brothers.

Oneshots focusing on Ayato, Laito and Subaru from the otome game Diabolik Lovers and a girl, Komori Yui, who goes to live with them.

Yui Komori is a positive-thinking girl who nevertheless is troubled by seeing spirits and experiencing poltergeist phenomena. In her second year in high school, she transfers to a new school — a night school for entertainers and celebrities — due to her father's work. There are rumors that there are vampires among the student body, and Yui ends up living with the Sakamaki brothers.

Rin was a certified yankee on her first day of High School when her brother dyed her hair blonde as a prank. On her way home, her hair got stuck on the bracelet of famous hair stylist Hanae!
With no way to free her hair from the bracelet, she ended up cutting her hair off!
Hanae said he’d take responsibility for damaging her hair... but what does that responsibility have to do with marriage?!

This series is a retelling of the SAO Aincrad Arc starting from a day or two before the clearing of the First Floor Boss, and continuing onwards. The first chapter was included in the Anime as Episode 2. Note: Please be advised that the side stories in this series have some changes from the original Light Novel versions of the Sword Art Online main story.

In the future, an energy source called "Life" has become incredibly important. Certain people are able to synchronize with devices called "Sai" which gives them the ability to extract "Life" and have super powers. These people are known as "Sai Takers." Within the "Sai Takers" there is an even smaller group, "Original Takers." "Original Takers" have a contract with a magical device, and they can manipulate "Life" without the use of a "Sai." These powerful people are also immortal, and they only die if they run out of "Life." The world admires "Sai Takers," but "Original Takers" are careful to keep their identities secret.

Nanase Kyouya is an ordinary teenage boy, who moved in with the girls Igarashi Kyouka and Yuma after the death of his parents. Yuma is a "Sai Taker," but Kyouka is an "Original Taker." One day, he goes with them to see a new model under testing of a magical device, based after Kyouka's. After a deadly terrorist attack, Kyouka desperately contracts Kyouya to the new device model to save his life. The device has some side effects, however, one of which is that it transforms Kyouya into a girl! Now Kyouya is secretly an "Original Taker", and he must go to the elite "Sai Taker" school, as a girl, with Yuma. Will he be able to keep enough "Life" to stay alive? Will he be able to navigate his life as a girl? What other side effects of this device lie in wait for him?

These people have been living unhappy lives because they've never been able to do what they want.

Ga Yeon's smart, but wants to become a singer. However, the Korean educational system strongly enforces studying to students without considering the goals and dreams of the student. She's been forced to live a life of suppression.

Jae Hee is a piano player, but he's been living in constant delusion of his life. He has mental problems and cannot distinguish reality from a dream.

Dong Woo and Min Seo are a couple who are talented musicians but cannot make music they wish to make because of the current situation of the Korean music industry.

Hyuk's a very good guitar player, but is forced to be in an idol band, rather than what he really wants to be. The 5 come together to make a band of their own.

The setting is back in the Dark Ages when the world lived in fear of the Demon King. That is until a Hero appeared who could save the world and its helpless people. The Hero gathered a party and seeks to bring love and justice to the troubled land. But the world’s a dangerous place–there’s all sorts of monsters, traps, poisonous mushrooms… when the Hero falls to these dangers, he goes to heaven and meets with a friendly NPC shepard.