4 Stories---The first and second story have the same heroine.

She works at a daycare center or kindergarten, and unknown to her colleagues she used to be a much feared female gang leader. ^-^ Also, the heroine has good vibes about a certain male colleague. One fine day, she meets an ex-male gang leader who knows her past...and events start unraveling from there.

For the second story, it's set in the daycare/kindergarten too. The main character is one of the kids in the kindergarten, and he has a secret which he is afraid to let other people know, especially his beloved teacher. (The heroine is his beloved teacher.)

Story #3
The main heroine is a 16 year-old girl. Her father is a scientist and always invents some weird things. What's more, he claims that he came from another planet! All these drive the poor heroine crazy ^-^ But at least now her love life is going fine...until the day 2 guys from outer space land on Earth, wanting to find out more about the 'Love disease'! Perhaps her father has not been lying after all?

Shizuka, age 17, was raised by her mother, and the two are very close. However, the store her mom's worked hard to maintain was swindled by the Sakurasei Real Estate Company.
Shizuka then, pretending to be the new wife of the president of Sakurasei, enters the Sakurasei family home while the president is away on business to get back the deed to her mom's store. In an instant she becomes "mom" to three boys, and the eldest son Kanon is the same age as her...

From Enchantment Scans]: Zhui-Ming (Shina in original) is just an average girl. However, due to a makeover, she accidentally gets mistaken for popular idol, Ai, by another famous idol, You. What's this? Ai and You are supposed to be dating?What is going to happen to Zhui-ming? (found in the series Panic x Panic )

From ShoujoMagic:

All Kumiko wants is to become a teacher; however her father is dead set against it. He is giving her one chance to prove herself as a teacher before forbidding her from pursuing this career forever. Meet her newest student, Ryu-kun. He has NO desire to LEARN anything from his tutors, rather he is an expert at teaching THEM about...SEX?!

Note: The story was originally released as a single short story, but it later became a series.

All of the girls at his college love Suou Tsukasa and come up to talk to him on a daily basis. Unfortunately for them, Tsukasa hates girls that are straightforward like that, but is too nice of a guy to tell them that.

In fact, he has a crush on Kizaki Megumu, his classmate and one of the shy and least talkative girls. The professor in one of the classes they have together is Dr. Hime, a young teacher whose childish looks and short height makes her a target for her students to jokingly tease and treat her more like their friend rather than a professor.

After taking home the drunk Dr. Hime, who was served lots of alcohol by her students, Tsukasa learns a giant secret about her love life.

From Essence of Purity:

Takuma Ban, only son of the Ban familly from Hokkaido, comes to Tokyo on a quest: to find a fitting wife... with the help of Meari his cow. Jumping over a school fence while carrying Meari on his back, he unexpectedly meets a girl, Yuki Samejima. After one minute, he decides that SHE'll be his bride. Unfortunately for Takuma, Yuki's older brother, Ranmaru Samejima, is completely opposed to this.

Of course, the fact that Meari seems to have developed an instant "animal" attraction to him only reinforces Ranmaru's dislike of Takuma. Takuma is determined to make Yuki his bride and that, despite Ranmaru's stern "objections". Nevertheless, when not only Kei Enjouji but also Takuma's own family start getting involved, things get a little … "chaotic".

(Note: was originally debuted as a shounen manga, but Kodaka switched publishers and began writing it as BL)

From 801 Media:

Being with an older lover is hot on just so many levels... Seiji-kun is a novice manga artist. He's also completely addicted to the body of the incredibly beautiful Sono-san, despite the fact that Sono-san is a guy. Is this love? Along with the title story, one that paints a tale of youth and emotion, this volume is filled to the brim with stories of overwhelming density, including "Not Just When it's Convenient" and "Let's Go Home." A total of six stories in all.

• Onegai dakara, Kiss (w)o Shite (Please, Kiss Me)

• Otona no Tsugou ja Naikute (Non-Adult Situations)

• Gaki wa Sunao ja nee (Indirect Youth)

• Aiganbutsu wa Oheya no Naka (Trophies Belong in the Bedroom)

• Ouchi e Kaerou (Come Home)

From Attractive Fascinante: Sensei rejected Fuji when Fuji confessed to him on graduation day. After that, Fuji always visited sensei and they still went out together. Sensei realized his feelings gradually and hoped to start afresh with Fuji. However, Fuji couldn’t believe it. But when Sensei’s ex-lover, Namiki, came back and wanted to reconcile with Sensei, both Sensei and Fuji found that they could no longer hide their own feelings anymore.

As a transfer student to a rough, run-down school populated by delinquents, Shindou tries his best to make friends. When he meets the ill-mannered Yousuke, heartbeats and tempers start to fly! It seems Yousuke is a "tsundere"--his gruff exterior hides a shy, sensitive side--and Shindou immediately finds himself dizzy over his combative new crush. Can Yousuke accept a relationship that goes against his tough-guy image? Or will his tendency to lash out at everyone around him drive even the earnest Shindou away for good?

From Viz:
Hime Kino's dream is to one day perform voice acting like her hero, Sakura Aoyama, from the Lovely Blazer anime. So getting accepted to the prestigious Hiragi Academy's voice actor department is the first step in the right direction! But on her first day of class she meets Sakura's grouchy son, Senri, who tells Hime that her voice is awful and Lovely Blazers is stupid. Hime will not let that stand unchallenged. She'll show everyone that she IS a voice-acting princess, whether they like it or not!!

Nagisa and her beautiful, intelligent best friend Yumi couldn’t be more different. Of course, her childhood friend, Ryou, is always happy to point this out whenever he can. When Yumi gets a crush on the equally intelligent and handsome Kei, Nagisa is determined to get the two of them together like any good best friend would, but it seems that Kei likes Nagisa’s outgoing personality more than Yumi’s shy one. And where does Ryou’s crush on Nagisa–and the one she may have on him–fit into all of this?

Shiina Momose doesn't believe in fortune telling and the occult, but for some reason, she can destroy anything with a touch. One day while on her way to school, a young man approaches her and claims to be a God. Furthermore, he believes that he was guided towards her and for that reason he has become convinced that she should become his first follower! Naturally, Momose refuses; but when strange things began to happen... she can not do something about it!

Tachibana doesn't have it easy. His lover, Sawada, just doesn't care who sees them kissing! Tachibana doesn't want people judging them, while Sawada just wants to show his love when he feels it. Will everyone find out what kind of love they have?

From Aerandria Scans:

Life isn’t sweet... Asaoka Yuuri, a senior in university, has failed for the 49th time in job hunting. During an exam at the 50th company, which should be a commemoration for her, she came to know Manabe Ryouji, a famous guy at her university. The first impression was horrible. But what will happen to Yuuri, who started to be attracted to Manabe, who looks cool and can do everything to the point that it’s annoying...?!

From Del Rey:

Everybody at Seiyo Elementary thinks that stylish and super cool Amu has it all: But nobody knows the real Amu, a shy girl who wishes she had the courage to truly be herself. Changing Amu's life is going to take more than wishes and dreams - it's going to take a little magic!
One morning, Amu finds a surprise in her bed: three strange little eggs. Each egg contains a Guardian Character, an angel-like being who can give her the power to be someone new. With the help of her Guardian Characters, Amu is about to discover that her true self is even more amazing than she ever dreamed.

Contains the side story Shugo Chara! Encore! in volume 12.

Shugo Chara! was awarded the 2008 Kodansha Manga Award for best children's manga.

Midori Yamate is a 15 year-old girl and is very much a tomboy. When she was young, Midori meets a boy called Tsukasa Hino, who came to the island she lives on for a holiday. He teaches her to play soccer and she falls in love with the sport. Midori is inspired by Tsukasa and continues to play soccer in hopes that they would meet again someday. When they do meet again Tsukasa does something unforgivable. Determined to defeat Tsukasa on the soccer field Midori enrolls in an all boy high school.

Contains a short story of 2 chapters called Shounen x Cinderella in the 8th and 9th Volumes:
Sakuragi Azuma has a secret that no one should ever know about: he's actually Momo Kasuka, an up and coming female model! While shooting a new drama, he meets another arising newcomer named Yui Hazuki, and things are going to get heated!

From Blissful Sin:

1-2) Shoujo Mangaka no Koi (Love of a Shoujo Mangaka)
(Adapted from the original oneshot)
“If I could be of any help, would you want to try it?”
To help incorporate boy’s love elements into his work, the unpopular shoujo mangaka Akimoto Yuu and his editor, Kurata, decide to carry out their own experiment.

The story of an awakening love that is embarrassing but warm.

3) Shoujo Mangaka no Koi Omake

4) Seppun Shuugyou (Kissing Lessons)
Seiji still thinks about the time he walked in on his childhood friend Daigo masturbating. Now Seiji can't help but do the same when he remembers it and it seems Daigo can't either; so what will our frustrated couple do when a co-worker takes a sudden romantic interest in Seiji?

5) Natsu wa Hagakure (Shadowed by the Leaves of Summer)

6) Hug Me, Hold Me

7) Tokyo Hotel

8) Passionate Pen Pals

Afterword

Even though she loves singing, due to fear of her older brother's disapproval, all Nonoko Sugisaki can do today is wish on a shooting star. But then, Kenji and Mikki, who hear Nonoko singing, decide to ask her to join their band...?

From Fantasy Shrine:

1-2) Butler Teaches Lesson of Love
"I've saved myself for you because you're my only master for life!"

Sera was acting out his rebellion against his parents, when Makieda, a former butler, came into the picture as a substitute teacher.

Under Makieda's guidance, Sera learned more than just becoming a gentleman. He also fell in love with this butler-turned-instructor. However, will Makieda choose duty to serve his former master over love? See how these two struggle to master the lesson of love.

3-5) Social Dance for Men
Thanks to an unfortunate accident the President of the Social Dance Club is now allergic to women, but that's not going to stop him from finding the perfect dancing partner.

Extra) The Butler Becomes Jealous at Night

A collection of short stories:

1. Mune no Kodou (Please Feel My Pulse)

2. Senaka Made no Kyori (The Distance to Your Back)
Ishikawa feels that his relationship with Yamaguchi has entered a stale period. Why is Yamaguchi ignoring him, and how can he get the spark back? The couple from Mimitabu no Riyuu.

3. Shitasaki no Netsu (Warmth of the Tip of the Tongue)
Valentine Day special with Ishikawa and Yamaguchi. Eight years later, they are still the same.

4. Kurubushi no Hone (Ankle Bone)
Ishikawa, being a klutz, is home for Golden Week, and Yamaguchi is going to nurse him back to health... sort of? The sweet couple is back and enjoying their first holiday together!

5. Takayanagi no Bangohan (Takayanagi Family's Dinner)
The Takayanagi family is very busy, since their parents are off on business in India. The eldest brother has no time to babysit his two younger (slutty) brothers, a NEET and a high school student, and hires a housekeeper who's a bit too cute for his own good. Or... is he?

6. Kotokunibito - Stranger (Gentiles - Stranger)

7. Mienai Shippo (Invisible Tail)