A collection of short stories:

1 Junjou Erotica (Pure Erotica)
Heartbroken by her first love, senior high year 2 student Rika develops a fear of romance. One day, she finds out her first love's weak point! From then on, she starts her revenge...

Extra: Passionate Erotica (unscanlated)

2 Renai Teppen Shugi (Romance Summit Principle)
The two most popular people in school, Rinko and Shirou, are pretending to be a couple to keep people from confessing to them. Rinko is slowly falling in love with Shirou, so what happens when someone finds out about their fake relationship?

3 Romeo na Kanojo (My Girlfriend Is Romeo)
Seiya was the prince of his school until a new girl, Ryou, transferred in. "If I can't win against her, my only other option is to make her fall for me!"

4 Ouji to Kiss to Nemurihime (Prince & Kiss & Sleeping Beauty)
Shiya has a phobia with boys. What can she do, but ask the almighty ?prince? of the school for help? The prince is shocked that this girl doesn?t like him, and decides to make her fall in love with him! But Shiya has a weird curse: every time a boy touches her, she faints!

A collection of stories:

1-3. Tadashii Ace no Kouryakuhou
a.) Hiroto Fujiki is the ace on his high-school baseball team. He takes an interest in one of his groupies, only to find out that "she" is not who "she" appears to be.
b.) Ayumu Tsumori is acting as the manager of his school's baseball team, and he borrows a book from his sister to help improve their chances in an upcoming match. Following the book's instructions, Ayumu starts cross-dressing for the team.
c.) Masaki Mizuhara fills in on his sister's baseball team, and catches the eye of the team's ace pitcher Hirona Fujiki, the sister to Hiroto from the first oneshot.

4. Hypnotism Trick
When Touri Hirahara is hanging out with his two friends Kashiwagi and Kunieda, Kashiwagi says he can use hypnosis, so Touri decides to fake being hypnotized. However, things get out of hand when Kashiwagi "hypnotizes" him into believing he's a girl.

5. Ani Tsura
Kazuki Hasegawa started drifting apart from his younger brother Kazuomi after he started getting interested in anime, specifically a certain magical girl anime he's particularly obsessed with. Kazuomi has been doing bad on his tests, so Kazuki agrees to dress up as Kazumi from the magical girl anime so that he'll put more effort into studying.

6. Khaki P to Sumire-hime
Rei Kawasumi is the vocalist of his high school band Violets, but they're not very popular, so Rei goes to ask the advice of Haruhiko Tsuchiya, a popular composer who posts his songs online under the name Khaki P. Tsuchiya tells Rei that to gain popularity, he has to not only cross-dress, but also sound and act like a girl.

7. Moshi Bare
Rin Aihara transfers to a new school, but tries to keep her intense love of baseball a secret.

From Evil Flowers:

Kurosu Riri is very bored with her school life. In an attempt to do something new she tries to form a band with Ayata and Jin. But something is still missing, a former member, Ruki Sugisaki is needed in order to have the complete band. The only problem is that he's in a fight with Ayata. Will Riri be able to make things work for her band and make Ruki join? Better yet, to have it formed before it falls apart...

From Adachi's Universe:

Slow Step follow the adventures of school girl Minatsu as she looks for a man and tries to stay on top at school. She's got the school bully to worry about, two potential suitors, a pervert for a PE teacher, and a gang of criminals in hot pursuit.

Manga adaptation of the (in)famous dating bird game.

From An Endless Story:
7 years ago she received a goldfish at a summer festival. The goldfish is named after her beloved Jin. But Jin, her childhood friend, will be leaving home. At the time, those words were uttered unexpectedly...

From Simple Scans:
Volume consists of five separate story lines + sidestory:
愛し金魚
real intention
星のロマン
LIFE IS WHITE...?
YOUR VOICE
巻末描きおろしショ－ト (sidestory)

Nakano Fudanshi Gakuen is a school renowned for its sports program, yet only has an average school rating of 50! Within the school, there is a club on the verge of losing its official status called "Fudanjuku". The club's theme is, to put it simply, "anything-goes". This story is a slapstick school comedy revolving around the unique seven members and their various troubles.

The tale of a boy who falls in love "at no sight." It seems that everyone has met her BUT him.

After a crazy night with an unknown beauty, a young teacher is tricked into becoming the father of two gorgeous young girls. Will they be able to accept him as their father when his male imagination is running wild?

High School Student Kiriyama Kyotarou's parents own a beauty shop that he helps in everyday after school. Due to the fact he has to go home to work everyday after school, he never has the chance to get a girlfriend or join any clubs. But that may change since the delinquent female gang-head of his school asked him to teach her how to be an idol.

Tomuro Shigeru is a loner. Because his teeth look like a tiger's, everyone calls him disgusting like an animal... so he's learned to keep his mouth shut. One day, he decides to eat lunch outside - since he doesn't have anyone to hang with anyway - and he meets a weird dog and his cheerful owner.

Fujima Taisei is a high schooler who had grown up spoiled by the people around him ever since he was little because of his pretty face. In his pleasant school life, there was only one time that had become the only stain in his life, when a student named Okachimachi, whom Taisei had grown close to in order to get others' attention, had told him that actually he had never been his friend at all. Now Taisei wants revenge. What will happen these two?!

From the manga Lovely Complex here we watch Koizumi Takuto (Koizumi Risa's younger brother) first year of high school as he takes on the adventures of his life. What will happen here..?

Kanau Yukimura is nine years old and she's meeting her father for the first time. However, he turns out to be an otaku! The two of them start living together in the same apartment, next to a lot of interesting neighbors. Unsurprisingly, things don't always go smoothly for these two...

Because of their parent's remarriage, high school student Satou Yuka, suddenly finds herself living together with her stepbrother, 23-year-old high school teacher Satou Taichi. Actually, their parents have not registered their marrriage and therefore they aren't even siblings by law; but since both parents aren't around, they end up living together! Taichi who has a very serious case of sister complex, wishes for Yuka to call him "onii-chan". But Yuka's reaction is very cold?

* Contains the short stories titled Private Princess, Chocolate Impact, Hot Chocolate, and Face of Fake as extras in each volume scanlated thus far. (Private Princess=vol.1, etc.)

Kid x Box has yet to be translated.

From JShoujo Scans: Hana is a 16-year-old girl who's a bit of a tomboy. She gets dumped by her boyfriend when she moves to Sapporo after her parent's divorce. On her first night there, she comes across a young guy who is seemingly too ill to walk. He ends up collapsing on her and is quickly rushed to the hospital. As it turns out, he's her next door neighbor, Shindou Hiroto. The next day, when she goes to her new school for the first time, she finds out that he's actually a teacher and that he's the teacher of her class! With his out-going personality and friendly demeanor, he gets along with everyone, but she notices there's something a little different going on between him and Nishiwaki, a classmate of hers whom the others write off as a "cold-hearted beauty." Hana always runs into him on her way to school, and as she gets to know him more, she finds herself falling for him! Things get even more messy when her boyfriend who broke up with her comes to Sapporo saying that he wants to give their relationship another shot!

From ShoujoMagic:
The two high school girls, Hanazono Mito and Tatsuda Seshiru, have been friends since kindergarten. But while Seshiru is an honour role student, Mito is constantly breaking school rules.

One day, Mito helps Seshiru evade the advances of the arrogant Ran, a rich boy and model who mistakes Mito's interference for jealousy (because of course every woman wants Ran for herself! Yeah, right). This lands Mito in hot water with Ran's fangirls, who later gang up to kick her ass! A new transfer student with wild hair is the one who saves her, but he won't tell Mito his name...!?

From Girls' Generation Scanlations:

1-2) Ouji no Kikan
Satake Kou attended the wedding of his sister where he was reunited with his cousin, Fumihiro, who used to be a very dumb fat guy, then transformed into a charismatic prince! Kou became undeniably self-conscious about this while not being aware of Fumihiro's high regards towards him since they were little. Fumihiro's admiration has turned into something complex. How would Kou respond to Fumihiro's feelings?

3-6) Metamorphosis
Adachi has been friends with Ritsu since they were children. Suddenly, Ritsu starts changing and acting like Adachi has never seen him act before... and the reason for that change seems to be Ritsu's new senpai, a troublesome guy. Adachi slowly realizes that he feels more than just friendship towards Ritsu... but it's too late.

7-9) By His Side

10) Ouji no Kikan Extra

A one-shot collab between Hatta Ayuko (Ookami Shoujo to Kuro Ouji) and Mizuno Minami (Nijiro Days). Sata Kyouya is the school’s guidance counselor and he has to deal with an odd group of students.

From Chibi Manga:

Kaji, Yuzuha's unrequited love, is a good friend of her twin brother Suguru. He's the same age but goes to a different school and since elementary school, he's been going in and out of Yuzuha's home. She's been in love with him all this time, but can't make a serious face when around Kaji. Now they both change to the same high school and there's the chance to decrease the distance between Kaji and her...?!