From StarryHeaven:
A short shoujo story about a girl who wants to continue the family tradition of her family…that is, get married at 16 and have a girl child at 17! A very crazy story about a very crazy girl named Ren who falls in love with one of the most popular boys in school, Juuya, at first sight!

From ClubManga:

Kayama Miharu enters her new middle school and immediately becomes friends with Mori Mizutama, a very cute guy she first takes to be a girl but is really a boy. However, though Miharu likes Mizutama, she cannot tell him, especially ever since the older Kawagoe (yes, a boy) seems to have taken Mizutama's interest instead. Miharu tries to be cute for Mizutama, but finds it practically impossible, as he is both more talented at home economics and more cute than herself. Then, Mizutama joins the Kawagoe's soccer club instead of the comedy-lovers' club the two of them had decided on earlier...

Also contains the story Fuyu Hanabi

The guy who's always been by my side... the distance between us changes...

Nanami Sekai gets scammed out of every penny he has, left only with a pair of boxers and a 3,000,000 yen debt. He then meets a girl, Ritori, who offers him a deal that seems too good to be true: she will take care of his debt if he will be her captain and help her with her job.

[Note]
It seems that this manga has been discontinued because the author became incapacitated during serialization and was not able to keep 2 series running.

From Chibi Manga:

Uta thought that her homeroom teacher was a geek, but she saw him when he was dressed differently. Sensei was actually a handsome rock-n-roll singer!? Since Uta had always wanted to have a boyfriend, she threatened him to "go out with her" and she wouldn't tell anyone his secret! but she ends up really falling in love with her teacher..!?

Contains:

• Natsu wa Ginga no Ame ga Furu
Summer Holidays. She didn't want to visit her grandmother, who she is on bad terms with, so she spends O-bon festival alone like she wanted. (Only for watching the house though!) And the person who appears in front of Akari is...!?

When boys put their hands in their pockets, it means they're hiding their feelings!" Chiharu has a boyfriend that is very, VERY quiet. At first, she didn't mind at all that he rarely spoke because she believed that she was fine as long as their feelings could be conveyed. Soon, though, she comes to realize certain things that makes her feel extremely anxious towards him... Why does he always keep his hands in his pocket?

From Bluebird Scans:
The gyaru, Hana doesn't like the person that sits in front of her, Nioka and Nioka also hates gyarus?!

From JShoujo Scans:

1. Seishun Walker
Being a tomboy who loves to get into fights, Ouka's had zero-luck in the love department. The motto she lives by leans more towards "Be Yourself" than "Be Ladylike," and she follows that to a T. But lately, her long time friend Mashima's been on her case about how she should act "more like a girl"...

2. Appare!
Oumi Koutaro is a new high school teacher who just finished university. The students fell for him right away. All but Yonehara who already has a boyfriend.

3. Red-Green
Suzumoto Kureka broke up with her boyfriend. All left from their relationship is a red bicycle that they bought together. Even though she can't ride it, she takes it to school everyday, because she can't let go of her feelings. But one day the bike got sealed together with a green one. What does the owner of the green bike want from her?

1) Youth Survival
Summer camping trips are supposed to be filled with joy and laughter, but why is Kiriko so unlucky~~? At first it was that weakling four eyes, Kazuo and cutesy Hana-chan destroying the pork soup, but then they never came back after asking them to go pick up some wild herbs! Oh, fine! So she and Satoru went up the mountains to get them, but who knew they’d get lost too?!

2) Liar Love Letters
When Ritsu's boyfriend asks to break up, she complies - only to find that he's angry about it. To make her pay for dumping him so easily, he puts on a bet. Trick Ritsu into falling in love, and win a good amount of money. When she overhears this, Ritsu is determined to shoot down all the boys out to trick her. But what happens when she comes across someone whose lies capture her heart?

3) Sword and Heart: Dangerous Relationship
When you add the Japanese kanji character for heart underneath the character for sword, sword becomes the character for shinobi. Shizuru, when younger, had a crush on her very brave and handsome ninja senpai, and still likes him to this day. Things in her life get a little complicated when other ninjas decide to steal something valuable that her family is taking care of.

4) Never Dying Crow…!
Otokomae! Beads Club side story

About a sixteen year old girl who graduated in Australia and returns to Japan to teach English in a high school. The students are of the same age and so she has a lot of difficulties getting accepted by them.

Collection of short stories:
• Spring Egg
Chika’s house was actually just an old lodging house, but due to the location, her parents decided to turn it into a student dorm for the college students. One day, she meets her first love, Fujimori Tomohiro, a college student who will be living at her house! But, Chika’s mother had made him signed an agreement that he can’t go after Chika-chan?! How would their love bloom?!
• Sunflower Girl
Misaki likes Kenji but she doesn't have the courage to confess. Now that summer break is close, she plans to give him a love letter, but...
• Happiness Faces South!
Sakura used to like her sensei, but now that he has a girlfriend she decides not to like anyone else. Bon, a college student sees her playing softball and falls for her. Will Sakura be able to fall for him too??
• Prince and I
Mari has always liked her next-door neighbor Kaoru, but he always treats her like an old hag. Then Mari's sempai confesses to her. What will Kaoru do?
• 2 Block Honey
Satoshi's girlfriend used to be a crybaby, short and cute. That was a year ago! Now she's taller than him and likes to wear high heels. How does Satoshi feel?
• Spring, Air, Sunday

1-4. Seinen 14-sai / Seinen 14.5-sai / Seinen 15-sai / Seinen 18-sai
Itou just found out that one of his best friends, Machida, maybe kind-of sort-of likes him. He doesn't say it, but he did orgasm when thinking of Itou even as he was about to have sex with his girlfriend! Now, Machida has a complex about Itou and even kisses him, and Itou develops a complex about Machida because his first kiss was taken! On the edge of becoming men, will they figure out their feelings?

5. Neko ni Naritai
The son of an apartment manager falls for a tenant who keeps several cats.

6. Kakedasu Otoko
Two longtime friends sleep together and navigate the awkward fallout.

7-8. Hana to Ojisan / Boku no Ojisan
An author mourns the eigth anniversary of his wife's death, and comes to see his younger cousin in a romantic light.

9-10. Kanashii kara Janai
A sad child wanders into a tobacco shop, where a sassy shop owner gives him a cigarette. The boy and the shop owner become friends, and she helps him learn to make friends (including her grandson).

11. Seinen ?-sai / Extra

Nikumaru, meaning "meatball" in Japanese, is a seventeen-year-old student at Ninja High School, a special school for the training of ninja. He is short and chubby, but he possesses a super technique known as the "kamikaze", where he stirs up a whirlwind with his feet. The series introduces his many adventures and pranks as Nikumaru meets with his rivals both in and out of school.

Sasameki Koto is the story of Murasame Sumika, an intelligent and athletically gifted girl who just happens to be in love with her best friend, Kazama Ushio. Unable to confess her feelings, Sumika can only stay by her side and watch over her. After all, the biggest obstacle to her love is something that she can't change. It has nothing to do with the fact they're both girls; Sumika just isn't Kazama's type!

Kazama is only into cute girls and Sumika's cool personality just doesn't fit the bill. Much to her friend's dismay, Kazama is always eager to share news about her latest crush. With the duo's knack for attracting trouble, it looks like Sumika's trials have only just begun.

From Karma Falls Scanslations:

Shinigami Ai is bored with his job and to seek enjoyment he has an interest in high-school girl Ren who only has days left to live. She is the student council president at her school and really a good-hearted girl, but she is feared by the whole school because of her harsh way of speaking. Ai possesses her body and exposes her kind, true nature and so enjoys his "Sarashi Asobi (Exposing Game)". But gradually he is starting to feel an interest in being with Ren...

Includes the one-shot "Lunch".

From Lovers Dream:

All too aware of being "just a teenager," Chiho is willing to do what it takes to confess her love to Somei-sensei, her teacher and the guy of her dreams. Still haunted by nightmares of a confession gone wrong years ago, she hopes for some high school romance... but wait, the nightmare himself is back, and he's going to her high school?! Things just got a whole lot more complicated for Chiho...

*Includes two side stories in volume 2:

• Suki Nanda Baka Yarou
• Unmei Nante Sonna Mono

Moyoco Anno lifts the veil on life in the Edo period pleasure quarter, Yoshiwara. The story follows Kiyoha, sold into a brothel as a child and forced to work as a maid and her rise to prominence as one of the top-ranking courtesans in Yoshiwara. The allure of the "flower and willow world," as it was called by artists in the day, is underscored by the very real tragedy, heartbreak and difficult lives led by those seemingly glamourous courtesans. Will Kiyoha’s fox-like wiles give her a chance to break free of her gilded cage? Or will her fighting spirit ruin her chances of ever escaping the brothel?

1. Sensei to, Uwakichuu
Hana is in extreme shock over the fact that her boyfriend cheated on her. When confiding in the Kudou Sensei from the school infirmary, he plays with her hair… Are you trying to comfort me? When she was trying to leave, he asks an impossible proposition "Would you like to have an affair with me?"!?

Hana who became limp from those words was asked "Are you anemic?" I’m not! He says we should just have an affair to kill time, but Hana doesn’t understand him!!
- Chibi Manga

2. Ouji na Geboku no Aishikata
Juri has always admired Makoto-senpai as a 'cool beauty'. One day, she accidentally overhears senpai's girlfriend breaking up with him which then she realizes, senpai is actually an M?! Even though shes caught by Makoto-senpai, Juri is so heartbroken over her now shattered image of senpai, Juri slaps him then runs away. But the next day, senpai...?!
- Intercross

3. Shitsuren, nochi Bon'nou
Ume's boyfriend suddenly breaks up with her and in an atempt to forget him Ume wants to become a monk. But at the temple that somehow ends up being the home of her ex she meets her ex's little brother Kojiro ...

4. Tenshi ni Kiotsukero!
When Mana introduces her new boyfriend to her childhood friend, Shion, he changes from the sweet angel she's always known into a little devil!?
- Intercross

5. Chokotto Mirai de Machiawase

6. Sensei to, Uwakichuu ~Extra~

From Intercross & Shoujo Crusade:

1-3. Sorairo Koiiro
Sora somehow ended up in a science class with all boys. Now, she's going to pitch in and help them enjoy school life by showing them her Girl Spirit!!

4. Sakurairo Koiiro

5. Sore demo Yappari Kimi ga Suki
The energetic and cute Rin is actually an otaku! Unexpectedly, she meets a 3-dimensional boy with the same looks as her beloved, Chris-sama! Otaku love in full bloom.

Shante Lisveriat, an alien, comes to earth in search of a bride, selecting skeptical middle-schooler Konomi.