Kannagi Ayano and Yagami Kazuma are asked to suppress an evil spirit that resides in the home of a collector of paintings. However, the original painting in which the spirit was sealed has been unsealed...!

From Esthétique: This is a crossover between Kanon (Key) and AIR (Key). Each chapter is a separate story of Kanon (Key) or AIR (Key), they're just short mini stories that were never seen in the anime.

Meiji Haruhito (Kanemochi-kun/the rich boy) just can't understand Misaki (Binbou-kun/the poor boy), but quickly falls for him anyway. However, Haruhito's love life is under threat. Not from a cute girl or ex-lover, but from his own grandfather. The boys' grandfathers knew each other when they were young and Haruhito's grandpa is delighted when he meets Misaki, who looks and acts like his late friend and (unrequited) love.

From Yen Press:

Legend speaks of seven heroes, each one bearing the power of one of the stars of the Big Dipper. Two of these stars are constantly in conflict, destined to battle and throw the world into chaos… Not that Taitou has ever paid much attention to old stories. Headstrong and defiant, he is the last in his village to complete his coming-of-age ceremony — a fact his sister Laila incessantly teases him about. When he is finally deemed worthy, he is presented with the Kenkaranbu, an ancient sword that can only be drawn by a true hero. As the frustrated Taitou struggles to unsheathe the sword, a mysterious thief appears, making off with the blade and citing the legend of the Big Dipper. The stars have been set in motion, as Taitou sets off after the Kenkaranbu and the truth of his own destiny…Hiromu Arakawa, creator of Fullmetal Alchemist, brings the legend to life!

From StarryHeaven:
The food loving and pure-hearted Sumire Misaki´s family is moving to the same town where her mother and father met and fell in love. Sumire´s mother tells her that its a town where she will fall in love, and she meets her first love in a very unexpected way: the good-looking Kazuki Miyamoto, as he tries to escape from his home. Through an unfortunate set of events, the wheels of fate have begun to turn for Sumire, as Kazuki is more than he appears to be.
In fact, he is a traditional dancer. Will Sumire´s first love be a happy one? Or does a bumpy road await her?

From Aerandria Scans:

Ryuu, a super-businesslike transfer student from England--with black hair, and blue eyes just arrived! During the night of the Tanabata festival, Ryuu and Yukino became attracted to each other at first sight. He then declares, “You will be mine!” This brought confusion to Yukino, who has zero experience in love. But could she actually be falling in love?

1. Kiss Yori mo Ijiwaru
Miku is admitted to enter an extremely prestigious school, where only elite students are studying, as a transfer student. Her only good point is that she's cheerful and enthusiastic. She's pleased to enter the school because it is a boarding school and the tuition is free. However, Omi, an elite but spiteful student, tells her to quit school. Miku is put in a tricky position, and accepts his challenge to a fight.

2. Sensei, Onnanoko ni Shite (Teacher, Please Turn Me into a Girl!)

3. Scandal Nante Iwasenai (Not a Scandal)
Yuuri is a total fan of the top idol Shibuki. Then during his concert, she gets an unique chance that any fan would dream of.

4. Yubisaki kara Hajimaru Furachi (The Evil Prince)
Keita, a hairstylist and a former gangster, suddenly asks Arimori Tsukasa to be his model after seeing her beautiful hair, but a street flirt comes and Keita saves her. They gradually become friends, but will there be something more?

From Aerandria Scans:

In the spring of her second year in high school, Asuka sees Masami playing Japanese drums in a festival, and she falls in love with him. However, Masami is deaf, and he has locked his heart in a world without sound. And thus, the two’s melancholic love miracle quietly begins. This is a pure love story in the middle of summer that will make your heart ache.

From Aerandria Scans:

A cute, short oneshot about a man and a cat.

1-4) Kimi Note
For some reason, Miyasaka finds himself absolutely enamored by the scent of his attractive male classmate Sawatari. But when he tries the cologne Sawatari recommends, the effect just isn't the same–it has to be on Sawatari or the cologne won't have the same effect.
A sweet story about the high school love between two boys.

5) Replay
Nishigaki was in a relationship with his junior Yaguchi during high-school. While attending his sister's wedding, Nishigaki remembers the day they broke up - when he took a gamble and told Yaguchi he would be attending a far away college... to see if Yaguchi would ask him to stay.
What will happen now, years later, when Nishigaki sees Yaguchi at the wedding?

6) Whisper of King
Kugayama has been sleeping with his club senpai since Ashiya made a move on him at a party. They're not lovers, and Kugayama never even knows if there will be a "next time", and so his insecurity continues following their ambiguous relationship. Until a senpai who graduated comes back for a reunion party... and Ashiya starts acting all weird. What will happen to Kugayama?

7) Go Home
Nakano had his senpai suddenly crash at his place after getting kicked out of his apartment for various offensive actions (like a threesome in his room). The problem is, Nakano is in love with his senpai, and knows it's only a matter of time before he can't help himself. One night, Nakano comes home to his senpai on his bed.... with a girl?!

From Tinte:
Suh Hyun-bin grew up under the cruel hand of street gangsters, but after her little brother dies, Hyun-bin runs away and is taken in by a rich family to be trained to become a bodyguard. However, she must hide that she is female, and pose as a man. And so, for eight years, she grows up as a cold, male, bodyguard. It looks like she'll be this way forever--until a fateful encounter with Lee Yun-ha shakes her very foundations, and leaves her conflicting with herself, as her feelings of love clash against her feelings of duty.

Collection of short stories:

1) Love Cruise (2006)
Yuri starts her extravagant cruise trip alone, after her aunt calls her and asks Yuri to go in her place since she had to work. However, since Yuri was just dumped by her boyfriend, she couldn’t enjoy the trip at all. Then, she is called by an audacious young boy, however, the next time they met, he turns into an adult?!

2) Kawaii no ga Osuki (2004)
Ema loves cute things, but they don't suit her. She especially loves the bears created by Minami-san and thinks they will make the perfect wedding gift for her sister. After discovering who Minami really is, will she be able to work with him?

3) Otameshi Kudasai (2005)
Nogawa is a serious sales person who only shows a smile to customers and guests. One day, he offers a free sample of fried Gengis Khan to a Yakuza princess. Later, she begins working with him, much to his dismay.

4) Ryuujin-sama to Oyome-sama (2009)
One day, Kawamoto Mizuho encountered a dragon god who chose her as his bride by paying her father a large sum of money. Although unsure of how to emotionally connect with the dragon god, Mizuho consents to the proposal. Can Mizuho learn to love the dragon god, and does he truly love her or does he only want to use her?

Kakimoto Imari the cute, petite blonde. Kakimoto Imari the tall, tomboyish brunette. They share the same birth month and year, and both came to the accident ward of the same hospital on the same day seeking treatment for similar injuries.

This is the story of two women with very different lifestyles whose fates become inexplicably intertwined from the moment they first meet.

From Project Kurai Ryu:
Young Kai has been passionately idolizing Ginta ever since his heroic battle in the War Games of six years ago. Since then, ARMs have become a common thing, Guardians especially! Kai himself doesn't have one though, and dreams big of being able to get an ARM like Ginta's! When his caretaker, the old ARM-smith that took him in after his parents' deaths, sends him out on an errand, he is attacked by a bandit from "chess"! In his escape attempt, he finds more than he bargained for when he comes across Babbo! But, now with Babbo's awakening, the fake ARMs are going out of control! Is it Kai's turn to save MARHeaven following in his hero's footsteps?

This is a cute dialogue-less little story about a young girl and an inquisitive little feline friend.

Setia is prisoner of Azurite, the tyrant king. She has a fiance waiting for her but the king seems to have taken a fancy in toying with her! But under his ruthless facade there appears to be...

Oneshot from Himegimi no Tsukurikata

Hisai Aoba, a 13-year-old male idol, is threatened to put off his upcoming stage performance. To prevent himself from danger, he hired a personal bodyguard, Tsukasa. At first, he thought that Tsukasa was just a taciturn and rude guy, but little did he know that...

Doujima Kenji and his friends decide to spend their winter vacation ghost hunting, however all but one of them cancel. Now, he finds himself alone with the girl he likes, and it turns out that there may be more to this ghost story than they had anticipated.

A collection of three separate stories.

I. Sui-Ren is Here.

II. Alice in Cyberland.

III. Mother's Guardian.

From Shinmakoku Scanlations:

Satou is a salaryman who is raising Rintarou, a toddler, by himself. After an event, he gets closer to his neighbour, Takahashi, a gay university student. Satou begins to get attracted to Takahashi who is fond of children and helps Satou a lot, but he held himself back thinking it would be too imprudent for him since he only got divorced just recently. Yet Rintarou starts throwing tantrums wanting to go to Takahashi's house all the time, and Satou is confused... What is going to happen? Here's a cute and sweet family story!