From Ultimate Manga guide:

Ibuki Morisato dreamed of kissing a prince turned into reality when her dream prince appeared as the new transfer student?!

A cat falls in love with a human who once took care of him. Wanting to stay by the young man's side, he agrees to a deal that would allow him to take human form--except in the eyes of the one he has feelings for! What will become of this love?

A collection of stories:

1) Ano Hi, Seifuku de (That Day, in the Uniform)
I haven't got myself used to this adult-like appearance with some nostalgic flavour of youth.

2) A Senpai
Body and mind think different things. But which one is true? A junior and senior love triangle.

3) Chuugaku 3-nensei (Middle School, Third Year)
There is a pervert in the male restroom in the book-store. Beware!

4) Hadaka no Boku (Naked Me)
Being shaved, becoming naked, the hidden feelings

5) Tenkousei (Transfer Student)
The secrets under the uniform, that none of the classmates knows.

6) Nikoichi
God knows when my childhood friend become much tinier than me. We have been through the heights and lows together, and now is my start with that childhood friend.

6.5) Extra to Ano Hi, Seifuku de - Konya, Ano Hi ni
2 years have already passed since that night.

1) Usotsuki Ookami
Satsuki is a counselor at a prestigious boys' high school. In fact, she is an ordinary high school student. Though she wishes that it will not be revealed, Tsuburaya, a problem student of the school, hangs around her...?!

2) Miscalculation of the Little Demon
His Family is about reach as mine, but he is 9 years older and already turned me down. then why is he here again?

3) Together with Doggie
They are interested in me because of my face. I'm tired of younger boy's confessions but this dog like boy won't leave me alone ...

4) Deli Bunny Girl
Working in a cosplay cafe for bunny ear maniacs when I'm just a high schooler! He find outs, what should I do now?

5) Non-sugar Darling
We've been dating for 1 year now, but it looks like there is no love anymore.

A collection of stories:

1) Ano Hi, Seifuku de (That Day, in the Uniform)
I haven't got myself used to this adult-like appearance with some nostalgic flavour of youth.

2) A Senpai
Body and mind think different things. But which one is true? A junior and senior love triangle.

3) Chuugaku 3-nensei (Middle School, Third Year)
There is a pervert in the male restroom in the book-store. Beware!

4) Hadaka no Boku (Naked Me)
Being shaved, becoming naked, the hidden feelings

5) Tenkousei (Transfer Student)
The secrets under the uniform, that none of the classmates knows.

6) Nikoichi
God knows when my childhood friend become much tinier than me. We have been through the heights and lows together, and now is my start with that childhood friend.

6.5) Extra to Ano Hi, Seifuku de - Konya, Ano Hi ni
2 years have already passed since that night.

From Summer Rain:
Between three highschool students, a secret love affair begins..

The main character is stopped from commiting suicide by a strange girl.

Vyalen, the main character in the story, is a graduating high school student from their school.Their school was pretty known as one of the best athletic and academic breeding students. In other words, only those who have special talents, elite minds, and abilities could only enter the school. Each of the students were categorized according to their major fields-- like being an elite, academic, and athletic. But, for the school's first in history they were not able to categorize Vyalen for whom he has this unknown ability that allows him to "artificially" use or create talents that he's not even used to... Moving on, within only 12 twelve days he will be graduating from his high school. That's why he is in a hurry for confessing his love to her long beloved crush, Trixy. But suddenly one morning, on his way to school, he suddenly bumped into a puny little nerdy girl named Lnear. having the thought that he had heard this name somewhere... later on. He finally realized that it was a classmate of his that must be sitting next to him that never came to school since the first day of class...

From K.I.S.S.: Everyone dreams of getting into Glory Hill, the university where successful applicants are guaranteed fame and fortune. Being looked up to as role models, the people of Korea are anxious to see what will become of the five new students which have been accepted. Watching from a distance a boy sits at the bus stop with an indescribable look etched onto his face. Original Webcomic

A collection of stories:

1-3. Teens Company

4. Remember 4 Side

5. Ato no Matsuri

6. Colors

From Manga Abyss:

Yoshino Haruka, 16-years-old, substitutes for her sister at an arranged meeting and ends up falling in love with Kunihiro-san... To discover the day after that he is her new home room teacher! How are the two of them going to deal with this forbidden relationship?

A high school boy named Kōichi Madanbashi who has Hi-ERo particles, the power source to operate the robotic weapon Daimidaler. With the help of Kyōko Sonan from the mysterious Prince Beauty Parlor organization, he stands up against the Penguin Empire that troubles humanity.

"Love Flower"
A three-part story featuring a loving adult couple who find a high school girl devastated by her senpai's apparent rejection of her feelings. The two women encourage her, and happily watch as a romance very reminiscent of their own teenage years begins to develop.

"Romance Women's Detective File"
A two-part story about a detective who helps locate her one-sided love's ex-girlfriend.

"Milky Way of the Two"

"Mystery of the President"

From Yuri Project:

Youko has a complex from being compared to her older sister her entire life, so middle school is off to a bad start when the tennis club is trying to recruit "Aiko-senpai's younger sister" and her best friend Maki. She is shocked to find out that Maki is interested in both the club and its leader Keita, whom Youko immediately disliked, and unfamiliar feelings of jealousy soon threaten to cause a rift between them.

Story 1: Himikoi (also included in Rabu Kare - Gokujou Men Dokuhon!)
What if the secret she could never tell was revealed, just before her high school graduation? To be able to face her feelings for Yoshii, whom she has a crush on, the two of them begin a secret game in their secret place. With the last day of school impending, what will be the outcome to her love...?

Story 2: During a Stormy Night
After losing her cellphone, Nao is only hoping that someone nice enough would pick it up, but much to her surprise, the person who finds it is the guy from the video store near her house. Too shy to go and reveal herself, she starts communicating with him solely over the phone.

Story 3: The Glass-bead Bridge
According to the old legend, if you dig out a glass-bead from the famous glass-bead bridge, your love wish will come true. That's exactly what Niina is trying to do during the cold winter time. Every night going to the glass-bead bridge and slowly digging, she eventually gets spotted by her old middle school classmate. Not promising to even meet up once, they still keep seeing each other every night by the glass-bead bridge. Will Niina's wish come true?

Story 4: The Red Turtle's Dream
"I like Sensei." Riku is loving him one-sidedly, but Sensei, who is very self-centered, doesn't even try to accept others. It is only during the short time while she's looking after his pet turtle, Kamekichi, that she feels closer to him, but Sensei's emptiness can't be filled with anything. She wishes for him to find happiness, even though she knows she can never be the one to fulfil it.

Story 5: A Perfect Day for a Picnic
A broken family can only find comfort in a family that went through the same problems. Years pass and people grow old. Some grow into wiser adults, some into young adults, and some into teenagers; teenagers that become interested in love and feelings. Their nervousness and awkwardness can lead to an uncomfortable situation, one that may make them regret what they did. Are love and feelings stronger than family bonds?

Story 6: The Hideout of Those Two
Thanks to her constant bluffing, Chi always spends her days on her own. Her only solace is the secret hideout from her childhood where a kind and protective Nii-chan used to live leaving her with a key and a promise. Will he really come back and when he does, what will change for Chi?

Hoshino is a timid grade school teacher. Sudou was one year his senior in high school. They meet again for the first time in over a decade and discover that Sudou's son is Hoshino's student. The two of them try to figure out how they feel about each other, and try to remember what it was that had brought them together and ultimately drove them apart in high school. They're both different, but that may not matter as much as how they still feel about each other.

From Chibi Manga:

She loved a teacher. But that kind of love is forbidden! Still she kept love him, and didn't care about it.

One day, she met a boy in white clothes in the greenhouse of the school. She saw his kind eyes and she smelled the odor of wood coming from him. For the first time, Tsugumi felt her heart beating for someone.

But after that encounter she understood that this guy was her teacher...!!

From DrCoke at MangaHelpers:

Even after one month of transferring to a new school, Natsuki keeps her distance from her classmates. Her childhood friend Haruka always tries to push her to be more sociable, but Natsuki just pushes her away. One day, while Natsuki was skipping class and eating lunch on the school balcony, a slime-like substance drops right on top of her. The slime slowly forms itself into... a human girl? An odd relationship between Natsuki and her new alien(?) sister Aoi begins.

From JShoujo Scans:

"I absolutely won't fall for this brat!"

Due to job transfers, Makoto has no choice but to stay at the home of her father's friend for the time being. But there lives a boy who makes her boiling mad!? Turns out he's the king of popularity at school, but he's a prankster who likes to mess with Makoto, and even recently dumped one of Makoto's good friends! How is Makoto supposed to handle this obnoxious brat!?

From Midnight Scans:

1. Akuma na Kuchibiru
Hana Yamada, a high school girl, gets sick during a mixer, and is rescued by a very cool male guy, who was casually passing by. However, when he suddenly asks her if she's an elementary student, Hana becomes very angry and kicks him, before running away. The next day, when Hana goes to the nurse's office, she finds none other than the very boy who'd made her angry, Shuuji Kidou...

2. Shoakuma Drops

3. Eien no Hidamari

4. Katekyo

5. Motto Agetai?!

Atogaki (Omake)

from Renta!