1) Ten Days by Aihara Miki
High school senior, Aiko, and 30-year-old Shirakawa are to have an arranged marriage, so they decide to try being a couple for 10 days...

2) There's No Logic To Love! by Usami Maki
Mayu can't get over her big shock from being dumped. But that's about to change with Tsukiyama!

3) Happy Happy Letter by Kikuchi Kamaro
Aiko is extremely thrilled to receive her first love letter. But the sender didn't include his name...

4) The Prince's Servant by Natsume Aiko
She's only in high school, and having an arranged marriage!? Plus her partner may be rich, but he's her classmate...

5) An Adult's Love and A Child's Affair by Kawamaru Shin
Norika is going out with a working man. She's only in high school, but she lied, telling him she's working too...

6) My Sweet Honey by Kanesada Yukio
Kimi has fallen in love with the school's "prince", Ken. All she could do was gaze at him, but he somehow became her boyfriend!?

From The Little Corner:

Revisit each of the Yamada family members as they have all grown up and well!

From Dragon Voice Project:

Collection of three short stories from the mangaka of Gakuen Alice. An older manga by Higuchi Tachibana based on certain fairytales. Cinderella, mermaid, and frogs...

Main parts from fallen_18/lonelyduchess :

Swan Lake: Nire, a girl that can be considered as Perfect. Unknown to others, she's actually poor. Very poor. Her goal is to marry a rich and handsome guy like Katsuragi-sempai. Aiba, a transfer student, had a bet with his friends to make Nire his girlfriend and eventually found out that she's actually poor. And so he threatened Nire to go out with him, if she doesn't comply to his wishes, he's going to tell everyone her secret.

Mermaid: Tajima, was a mermaid princess who turned into a bubble. After a hundred years, a witch gave her a chance to get reincarnated into a human to search for her prince who was also reincarnated. The witch told the mermaid that when she finally finds her prince, she'll be able to remember her mermaid past and she wont be able to speak to him for a whole week. During that week, Tajima has to make the prince fall in love with her or else she'll be turned into a bubble again...

Frog Princess: Kikuhime, hates frogs. One day, she spotted a talking frog, who was once a human being named Ukia but was cursed by a Frog Deity for killing many animals. Whenever he hears the word, 'Frog' he'll turn into one. But Ukai spotted her coming out from a maternity clinic, now a turn of up and down events are coming to Kikuhime's way.

1) Sukinara Sukitte Ieyo! - New male teacher Himeno at an all girls school is confronted by class chairman Asuka, will hearts collide as well as tempers? 2) Uso Toki Doki Honto - Himeno and Asuka are in somewhat bliss, but what will happen when their relationship my leak out and doubts creep in. 3) Love ver. 5 - When ruff-and-tumble Hokuto is looked upon kindly by a Miharu, what will he think when he goes to her house and finds her 4 beautiful male roomates? 4) Hard Bread Morning - When Yuki meets Tooru she's taken on a whirlwind 'date' and ends up working at the bread place with him. What's under his mean demeanor and passion for making bread?

Jung Euimoon and Eun Myroyung are both members of the second Biology Club, which has been downgraded to the oldest facilities in the school to make room for the new Biology Club. Jung Euimoon uses Bunsen burners to cook his breakfast and routinely camps out at the Biology Club room to get away from his numerous siblings. Eun is a loner and reads tarot cards--which always foretell unhappy auguries--to amuse herself. They each think the other is strange. These two seem to be opposites, but they have more in common than they think. Who knows what the future holds in store for them.

Nae and Shuji were chidhood friends, but they havent seen or talked to each other in years. Shuji takes it personally while Nae is only keeping her distance because everytime she sees Shuji, her crush, she gets a nose bleed. So what's Nae suppose to do when her and Shuji get assigned to the same homeroom, moreover they're both elected to be the class representitives?!

From TokyoPop:
The “legendary”, “mysterious” aesthetics group at school, known as The Knockout Makers (a.k.a. KOM), accept commissions/requests/jobs, for free, for pretty girls in need with a desire to be beautiful. Through their endeavors to achieve beauty, we learn a little more about their female clients and the trials and tribulations teenage girls must endure.

Eratarou Kamegashira is a normal guy. All he wants is to live his high school years in peace and tranquility, hopefully making a girlfriend or two in the process. However, his brother Maratarou is a gigantic pervert. Due to Maratarou's shenanigans, Eratarou has been having trouble making any girlfriends due to being associated with him. However one day, the beautiful Takahara-san asks if she could visit Eratarou. Will Eratarou be able to keep his cool and win the girl, or will his brother cause things to "heat up"? Find out in the Kamegashira Brothers!

1. Kiss Yori mo Ijiwaru
Miku is admitted to enter an extremely prestigious school, where only elite students are studying, as a transfer student. Her only good point is that she's cheerful and enthusiastic. She's pleased to enter the school because it is a boarding school and the tuition is free. However, Omi, an elite but spiteful student, tells her to quit school. Miku is put in a tricky position, and accepts his challenge to a fight.

2. Sensei, Onnanoko ni Shite (Teacher, Please Turn Me into a Girl!)

3. Scandal Nante Iwasenai (Not a Scandal)
Yuuri is a total fan of the top idol Shibuki. Then during his concert, she gets an unique chance that any fan would dream of.

4. Yubisaki kara Hajimaru Furachi (The Evil Prince)
Keita, a hairstylist and a former gangster, suddenly asks Arimori Tsukasa to be his model after seeing her beautiful hair, but a street flirt comes and Keita saves her. They gradually become friends, but will there be something more?

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~

In the play of life, all Hikaru Takabayashi wanted was to be part of the scenery. Tormented by jealous schoolmates ever since she appeared in a famous commercial in grade-school, Hikaru transfers to a prestigious all-girls' academy where she hopes to settle down to a quiet life of anonymity. But when her new roommate turns out to be the super-popular TV idol Izumi Kido, Hikaru finds herself thrown smack in the spotlight's glare once more! And as if living with a celebrity wasn’t bad enough, Hikaru discovers that there’s more to Izumi than her “good girl” image—she’s a he! And this is only the first of Izumi's many dangerous secrets! Now Hikaru’s the unwilling star player in a madcap tale of deception, abduction, humiliation and blackmail...

From Boku-Tachi:

Kaoru thought that high school was boring. And then he met Kaname and Yuta. Kaname and Yuta are trying to start "The Creator's Club", a club with creation of all sorts of unusual inventions as its aim. The club's formation is opposed by Kaoru's reticence to make up numbers, and the school council president's obstinate nature. With the aid of hard work, cheeriness, and sheep, Kaname, Yuta, and a somewhat bemused Kaoru set about changing her mind.

He's in the same class, but she's only talked to him a few times. Whenever their eyes meet, Naho can't look away. Their relationship heats up quietly... Ai witnesses them together and takes an action that ends up changing her friendship with her guy friend, Shun.

Includes:

Tsuki wo Dakishimeru
Next to You
Girl
The Night of the Shooting Stars

Oogami might look like a tough guy. Tall, well-muscled and a bit wild-looking, it's only natural that Oogami would be scouted by the school volleyball team, right?! But in reality, he sucks at sports and is a bit of a wuss. But his crappy serve is about to be the least of Oogami's worries. You see, his family has a secret...

Collection of short stories: • Tongari Root Ruu is a high school student who studies seriously everyday, aiming to become like her genius brother, Shikyu. At this time, at Ruu's side, comes Jijyou, Shikyu's friend, who become's Ruu's teacher at home. Although Ruu's life has been messed up by the daring Jijyou, she has started to have feelings for him... • Monochrome Candy It can't be cast off, it's fascinating, that silver wrapped candy. • Bye-bye Babe Flowers will bloom upon the earth. • Love Fight So Beautiful! With this thought, my body just moves by itself. I really want them to see him now.

What starts as a simple kiss between childhood friends, turns into something else?! Will their friendship crumble as they become adults or will it become something more?

From StarryHeaven:
Jun has always liked the super popular and hot Kazumi-kun. However, he always has girls competing for his attention. So when the newest issue of a shoujo magazine comes out, she buys it for the furoku (freebie): a paper charm that you write your wish on and put under your pillow so that it’ll come true. Her wish? To be with Kazumi-kun. She doesn’t expect the charm to work anyhow, as she’s never had any luck with them. To Jun’s surprise and delight, in the morning she wakes up to find that she’s friends with Kazumi–but in a boy’s body!

Arare knows she's a rain fairy - her mother is clearly not entirely human but on her first day of high school she definitely does not expect to enter the Otherworld. Nor does she expect her teacher to have a ridiculously long neck, or her classmates to be a variety of ogres, snow demons, cyclops, ghosts, mist, or the twin-tailed cat, Kiri, and long-tongued girl, Pero, who befriend her. Nor does she expect the veil between the worlds to close behind her, leaving her stranded in this school for girl monsters.

From JShoujo:

If you wanted to find a good-looking guy, where would you look? The answer is easy – it’s the “Tokimeki Campus”. Here, the whole place is overflowing with princes! However, most of them already lead a wonderful love life. Starting from a narcissist, you’re going to be introduced to the colorful stories of the campus!

Ryota plays it cool around all of his classmates, especially when it comes to girls. But he’s always the one on the spot in a perverted situation. In some of these many random anecdotes about the lives of fifth graders you'll find: peeping at collarbones, eating chalk, accidental skirt flipping, missing bloomers (you know, those girls' gym shorts things), and many others. Who says grade school can't have a high-school-type love story?