From Dragon Voice Project:
1. You Win (Kimi no Kachi)
Ayu's classmate, Kataoka, is popular among girls. But Ayu doesn't like him that much, because she thinks that he isn't a nice person. But...!? Depicting the feelings every girl should feel when in love, vividly and sensitively, it's the best school love story.

2. His Back, His Heart (彼の背中 彼のハート, Kare no Senaka Kare no Heart)

3. Spring Fever

4. Constellation in July (七月の星座, Shichigatsu no Seiza)

5. My Beautiful Boy

From Osuwari Team:

Mitsuha is sick of her stupid friends and boring school life. All she wants is to be left in peace. One day by mistake she becomes penpals with Haru, whom she doesn't know at all. Only with him can she be honest. There's one guy in Mitsuha's school who's just the way Mitsuha would like to be - cool, a little scary and above all - alone. One day she meets him in a bus... What will happen next?

*NOTE: The mangaka, YAMAMOTO Keiko, decided not to draw for this manga series anymore after it went on a hiatus since the seventh issue of the Margaret magazine. Another mangaka, NAGI Michiko, will continue this manga.

Two high school friends take advantage of their friend's love for gaming by devising a game of their own to prevent him getting too close to a girl.

From Chibi Manga:

She's always taking the same train when she goes to school and in that train there's a boy with such a beautiful smile. She doesn't know in what school he goes but she's so attracted by his smile. And one day, the train suddenly stopped. That's the start of their love. You will see the first steps of a love between adolescents.

From Midnight Scans:

1) Simple Kiss by WATANABE Ayu
Once in a while, we kiss in secret. We are not lovers. We’re just “friends who kiss”. This was supposed to be a simple relationship, but…

2) Guruguru Pon-chan Okawari by IKEZAWA Satomi
With a miraculous invention, a small dog (male chihuahua) turns into a human! This is the interesting story of Sakura (human female) and a chihuahua living together!

3) Akarui Mirai by MIYOSHI Maki
To Sensei, I’m just a “student”, but to me, he’s a “man”. Although it’s not a love that is permitted, will this feeling of love that I have for Sensei ever reach him?

4) Goodbye, Friend by KUMAOKA Fuyu
Kyoko was confessed to by the guy her best friend likes. Although her friend is very important to her, and she definitely doesn’t want to lose her friendship with her, she can’t bring herself to break up with him…

5) Kimi ni Tsugu Ishiko
July 7th. I dye my hair and turn into my dead twin brother. Both my twin brother and I loved the same girl, and I can’t tell her the feelings I have for her because it is the punishment I gave myself…

Ichinose Tsukasa, an elite student at a public school, can't help watching Matsubara Chitose, another student that is his complete opposite. When Matsubara confronts him, Ichinose is drawn into a physical relationship that becomes more than either boy expected.

Amano Sui has one serious problem: she falls in love (and out) for cute guys too easily! When she shouted she wanted a boyfriend the quiet guy Matsutani confessed to her?! Naturally she turned him down since he is not her type, but is that the really right choice Sui?

From Girls' Generation Scanlations:

A series of one shots.

1.) If you Were:
Fujisawa Yuuji, moves from Tokyo to a little village, because of some personal reasons. Yuuji is tall and good looking, making it easy for him to pick and choose his girlfriends. However, on his first day at his new school in the country, he spots a red-headed boy that stands out from the rest. Who is this boy and what's his secret? Will Yuuji decide that a boy is better than a girl...

Kimikiss Sweet Lips is a collection of one-shot stories that tells about the relationship of an ordinary high school boy named Aihara with the 9 heroines from the Kimikiss series. This manga is from the same game and anime adaption.

Collection of short stories:

1. Hoo ni Shizumu

2. Kimi wa Chiisana Kesshou (You're My Small Crystal)
Kaho puts on a facade in front of everyone, hiding who she truly is, in other words lying to those she cares about in order to make them feel at ease. One day she meets a boy at a social gathering who sees right through her and helps her change...
- Fate

3. Wagamama ni Dakishimete

4. Yakusoku ga Kimi wo Yaburu
Aina and Tooru are childhood friends who made a promise to always be siblings. As the years pass, Aina?s feeling for Tooru turned to love but Tooru became cold and distant. Will either of them be able to keep their promise?

When it's love at first sight, your beloved sparkles right? Love makes everything sparkle...

A kiss is shared with her kouhai, Hasumi-kun, through a game of Kings?! What will result from the throbbing of hearts that they experience together?

Contains 3 oneshots:

1) Kimi wa "Suki" no Daimeishi
From Midnight Scans:
I didn't think you'd still remember me once you'd gained fame. When you're supposed to pick me up, you don't even think to come.
That's why, when there's someone who even slightly resembles you...
Ten years ago, you left me to become a kabuki actor. But I still remember the promise from that day... You have become famous and are called "the most beautiful high school student in Japan". I'm living in a different world from you. That's why you won't even think to meet me once again...?

2) Hetakuso Kata Omoi (Hopeless Unrequited Love)
All Yuri wants to do is talk to her crush in her art club, Yano-kun, yet she's able to do anything but. Getting an idea, she asks Yano's best friend, Kimidzuka, for some tips on how to make her ideal for Yano. Though reluctant, Kimi-kun helps out...

3) Towa ni Nemure (Eternal Sleep)
Jin's just a lowly pirate with an incredibly handsome face and loves playing with women, but this annoying female brat, who he was going to sell as a slave with the rest of them, somehow feels different from everyone else.

From Peccatore Sanctuary:

The cheerful and open high school freshman, Nakazato Haruka has fallen in love! With his classmate - basketball's club Tajima Kaoru. Haruka started his fierce attacks, and also declared "You will like me for sure!" How will the cool and quiet Kaoru react after knowing about Haruka's feelings?

Series version of the oneshot/tank under the same name done by the same artist.

Volume 1 of the series is the oneshot/tank containing four oneshots. The oneshot Sukitte Iwaseru Houhou is basically a Chapter 0 (Prologue) to the story.
The story continues in Volume 2 - from Chapter 1 of Sukitte Iwaseru Houhou.

Cute and popular, Nanoka seems to be the type of girl who could get any boy using her so called “tactics”. Accepting confessions and dumping boys at the snap of a finger, she’s never truly been in love… until she met the Cooking Club President, Haru. How can she catch this upperclassman’s attention when she can’t keep herself composed enough to use her so called tactics?

For a little while, Kiyomizu Iroha and her best friend were met with joy as they ended up in the same class. But then, every day she starts feeling left out after her best friend got a boyfriend. Would Iroha do the same...!?

Momoko is a shy girl who spends all her time reading girly novels. She longs to fall in love like the heroines in the stories she reads, and one day her dream seems to come true! After a fateful encounter worthy of a novel, Momoko decides she's in love with Oshima, her school's ace baseball player. But how can she get closer to him?After consulting her precious books, she eventually ends up helping to revive the unpopular traditional Japanese cheering club to cheer at the school's baseball games. However, they've only got just enough members to keep it from being abolished, and none of them seem to know exactly what they're doing. Their first performance is so dreadful that people even blame them for the baseball team's defeat! Their ragtag cheer squad will have to get its act together if Momoko is to have any chance of realizing her fiction-worthy romance!

From September Scanlations:

While he cannot explain it, Udou Ryuuji is absolutely certain of one thing: he loathes Kujou Ritsuki from the very core of his being. There's just something about his good looks and the way he flirts and has all the girls eating out of his hand that pisses Ryuuji off royally—so when he accidentally discovers the deep dark secret behind Ritsuki's part-time job, he's of course going to milk it for all it's worth...right?

1-3) Kiss no Mukou
Kirio, Shirou and Eita were childhood friends. Kirio had always liked Eita and fell into a state of depression when Eita got himself a girlfriend. Kirio thought that he and Shirou are in the same "heart-broken" state as he always assumed that Shirou are also in love with Eita. However, one day Shirou blurted out that it wasn't Eita that he likes, but Kirio himself. Since then, Kirio became more self-conscious whenever he's with Shirou...

4) Eggshell
There are 7 months and 15 days until Toya Haruki graduates from high school. Until then his teacher Shiihashi intends to make him wait before he agrees to having a relationship with him. In the end who will win out Toya or Shiihashi?

5-6) The Sky We'll See Tomorrow & Stripe
Hitomi is being transfered to Osaka so he decides to break up with his lover Saki before leaving. It seems that Saki isn't going to just let things end.

From Dazzling Scans:

Hiiro has been crushing on Wakana-kun ever since she first saw him practicing kendo. However, she gets the shock of her life when she finds out that Wakana-kun is in love with his best friend, Anji-kun!