Homura Tsukishima and Sakurako Hirosue are roommates at Principia Academy, a school located on an island created specifically for researching "shiki", which is a form of power created by manipulating numbers.

From Vices and Devices:

Isayama Natsu is a free spirit: he doesn't wear socks, he sets butterflies free from rooftops, and he gives blow jobs to other boys in the school tool shed. And Taneda Kouki, who believes himself normal in every possible way, accidentally sees the last one while taking a shortcut. Isayama bewilders and fascinates Taneda, who also begins questioning his own normality...

Bushidou Sixteen centers around two female competitors of another Japanese tradition, kendou (sword-fighting). Kaori is an accomplished kendou practitioner, but she finds herself facing an unexpected opponent in Sanae, a superficially weaker fighter who bests Kaori in a bout.

From Ochibichan.
Oukawa Nabiki is an energetic and cheerful girl who dreams to become a stuffed toy maker. Ever since she joined Kousei High’s Crafting Club, with Fukamachi Itsuru, a boy who dreams to become a silverwork designer, both of them work hard together to become professionals! But due to the fact that Nabiki has to attend extra lessons, she’s not allowed to do any club activity for a week?!

from -dokidoki- :
Ichirou's best friend Naoto's noticed that he's been acting a bit unusual since summer vacation. With a bit of best-friend solidarity, Naoto squeezes out the tale of Ichirou's secret summer fling: a sexual encounter with a mysterious stranger fleeing from a rainstorm. Naoto is, naturally, scandalized, but not half as scandalized when he and Ichirou run into the summer fling again at a school festival...

As if a guy falling in love with another guy wasn't complicated enough! How about when that boy's already got another guy after him? Throw a live-in cousin with an aggressive crush and the world's cutest lovestruck best friend into the mix and the situation gets rather convoluted, even by Koide-standards.

From Dan of Population GO:

"This charming story follows Kanon Miyamoto who, ignorant of her popularity, is confessed to by Bessho Chiaki, the school's most intelligent and beautiful girl."

Listen to the world's various stories on Yoo Si Ae's radio show, Cactus and Radio.

A collection of oneshots:

Her Carriage
Everyday Kouta comes to pick up Aya on his bike. Aya loves Kouta, but Kouta is looking for a girl friend. Will Aya ever tell Kouta how he feels?

Make-Believe Brothers
Art student Yuuta and Tomo are neighbours and childhood friends. But is that all they are?

After-School Strawberry Flavor
Everyday Tsuduru finds candy in his school desk; probably left there by a night school student. He starts to exchange letters with the unknown giver; but will they ever meet?

Finger
Although Akio, who has a hand fetish and confesses his love for Hayato, Hayato refuses to accept
the fact that he loves Akio as well, until Akio decided to leave to study abroad?! Will Hayato come to face his true feelings?

Four Leaf Clover
Yoshida unconsciously began noticing Yukimoto, a boy with weak health who always sits PE out. When Yoshida starts finding four leaf clovers in the class diary, he asks Yuki if it was him...

Cello Mellow
An attractive cellist by the name of Mahoro is a hopeless man who can't recognize love. Mahoro, who has never loved anyone before, was picked up by Sousuke on a rainy day one year ago. Woken every morning by Sousuke, the sleepy Mahoro finds himself drawn to Sousuke's smile.

From Condensation:
The story centers around Keito Aoyama, a former famous child actor. Due to a childhood incident, she retired from her career early and withdrew from normal society. Now 16, she passes her days in boredom and without purpose. But one day she runs into a stranger who takes her to El Liston--a free school for high school students like herself, who don't have a place where they belong. Though hesitant at first, Keito decides to enter El Liston and subsequently, she begins a new stage in her life. With the help of her only remaining childhood friend, Taiyou, and her new classmates Rei, Momiji, and Kouichi, Keito slowly finds the courage to open up to others and to accept their support. Will Keito return to acting? Will she find true friends? Love?

From Entropy:

Jin Young is a good student with good grades, but she has a little bit of an unstable mind. Hye Jung is a cheerful girl who helps out at her mom's "snack shop", a sort of small restaurant that offers light meals to diners. Both attended the same school, and both transferred to an independent-study private school, where they meet Si Hyung who is an instructor there. Si Hyung used to live in the same neighborhood with Jin Young when they were young, but he's surprised how Jin Young has changed into a cold person.

By anonymous:
Nohae has been crushing on Dona, his neighbor, since they were younger. Dona is a girl who was obsessed with money as a child and would make her childhood friend Nohae actually pay her. Time has passed and now she's a teen, broke and living on the streets with her dad. Her dad meets Nohae and arranges for Dona to live with him. But Dona's not your typical heroine. She's one of those fake people, maintaining a perfect image at school but in front of her parents she's self-absorbed, a glutton, and is quick to nab a meal or swindle money. She's quick to anger and has a grudge against Nohae, but he likes her so much he's completely unaware.

Fujisako Aiko is a nice but somewhat solitary girl attending the beautiful and isolated Enishida Academy, a boarding school on a lush, walled-off island. One day while wandering through the island's woods, she peeks out from behind some trees to to see two foreign-looking girls around her age in a forest clearing.

One is cold and pretty. Another is cheerful and happy. In spite of their differences, Aiko soon finds out they are sisters from a royal family from another kingdom! Swept up into their luxurious surroundings and their large household of brothers and sisters, she is happy with her new friends. But what is this subtle wrongness she senses from time to time? And how come she feels so drawn to the obsidian eyes of the coldest sister of them all?

A volume of cute and romantic short stories:

• Caramel Milk Tea
Nozomi, a high school student, did not believe in love at first sight. But it happens that she is in love with a cafe clerk. Immediately she declares love to him. But because he gives her the cold shoulder, she is disappointed in love. Now she begins to work part-time for the cafe where he is working.

• Futari no Jikan (Two People's Time)
Eri hangs out with her childhood friend, who she hasn't seen in four years. They've changed over the years, but certain feeling have stayed the same.

• Kirakira no Kimochi (A Sparkling Mood)
Narumi tries to make the most of her time before she moves on Christmas Day, but falls unexpectedly in love.

• No. 1 Girl
Saiko must choose between her career or her love.

Orange Kiss contains Happy Words, a prequel of No. 1 Girl.

[From Lililicious]:

In "Cherish" a girl struggles to come to terms with how her friend has changed.

The Otohime Private All-Girls High School is a very prestigious school and full of pretty girls. However, there is one male student attending the school, the director’s son Ouji. Ouji is a creepy pervert who can get away with anything because his father doesn’t punish him. He’s got video cameras all over the school to get footage of his classmates naked or near-naked and constantly sneaks around with cameras to get photos of them. The school is his paradise.
All this will change in the coming year, though. His father has decided to make the school co-ed, but with only baseball players so that they can aim for winning the National High School Baseball Championship at Koshien Stadium. In preparation for this grand dream, the director insists that the girls of the school establish a cheerleading squad. Seeing his glorious world collapsing around him, Ouji latches on to the most hopeful thing he can find: the cheerleading squad. Now he and the reluctant student council president, Itsuki, are going to recruit members and try to get this team going.

From StarryHeaven:

High school first year Sara has a secret…she’s really the super-popular singer SALA! However, as an idol her gender is kept a secret from the world in order to sell her music. But can Sara win when she wants to be just Sara…?

Kisaragi Maki is the heiress of a yakuza group. She only dreams about being a normal high school student, and becoming an ordinary bride. However, when she sees blood, she changes completely and becomes violent. Will she be able to keep living an ordinary life?

Toride has always loved his cute classmate, Ayase. Due to an accident, Toride's spirit went to Ayase's penis, a weird couple then was made. They both have feelings for each other, but is it really a blissful thing for a relationship such as this? The accident not only changed Toride and Ayase's life, but also Iwabuchi- the emotionless, and Kamiya- the playboy? Unlike Toride and Ayase's situation, Iwabuchi and Kamiya have their penis switched, and their penis can talk?

Vol.4 is a complication of the doujinshi called Chintsubu A-G.

A collection of oneshots:

1) Chiki Chiki Banana
Two bold, hot and fashionist high school girls, Naomi and Jennifer must certainly have many perverted stories to tell...or so you'd think. But they are actually pure virgins! The two finally get boyfriends, and their hearts beat fast as they look forward to their first sexual experiences, but what happens when their boyfriends stumble upon a magazine where Naomi and Jennifer are labelled as 'Champions in Sex'!? A must read for beginners in love!

2) Dok!n
Misa and Yamato have been dating for a while but they haven't taken their relationship to the bed yet. Yamato prefers to take things slowly but when their friends push them to take the next big step, Yamato invites Misa to his house but will everything go as smoothly as they expected!?

3) Wild Card
Ikumi likes Kurata-kun, the guy she has been friends with since middle school but whenever she tries to confess her feelings to him, somehow or the other, Mami-chan interrupts her. So Ikumi asks Ken-kun, the most popular playboy in her school, to flirt with Mami-chan and take her away so that she can approach her crush Kurata-kun. Little did Ikumi know that her 'wild card' would actually turn out to be a 'joker'!!

4) Red Hot
Komaki has a crush on the Student Council President Amamiya-kun and so she becomes a member of the Cultural Festival Planning Committee to be close to him and to win his attention. She soon finds out that a delinquent gang known as 'Red Hot' is out to defame the President in public so as to ruin the Cultural Festival. Komaki offers to work as a spy for the President to get into his good books. Komaki is shocked when she discovers that the Council's Vice-president Kiichi-kun is actually the leader of that gang. Can Komaki save the President before it is too late?

5) Muki Muki Banana
Chiki Chiki Banana extra

From Attractive Fascinante:
Yuu, Kouichirou, Natsume and Shino are classmates.

1-2) Yuu-kun's Love & Kouichirou-kun' Love
Kouichirou took really good care of Yuu since young. Yuu was afraid that Kouichirou would leave him behind if his grades dropped so he worked really hard and got a fever. When Yuu kicked up a fuss in the infirmary, Kouichirou kissed him. What did that kiss mean?

3-4) Natsume-kun's Love & Shino-kun's Love
Natsume and Shino had been sex buddies for quite some time. Although they had feelings for each other, they never confessed to each other. Shino finally broke down and confessed. Would Natsume accept him?

5) Light Whispers