From MangaHelpers:
17-year-old Awaya Mugi and Yasuraoka Hanabi appear to be the ideal couple. They are both pretty popular, and they seem to suit each other well. However, outsiders don't know of the secret they share. Both Mugi and Hanabi have hopeless crushes on someone else, and they are only dating each other to soothe their loneliness. Mugi is in love with Minagawa Akane, a young teacher who used to be his home tutor. Hanabi is also in love with a teacher, a young man who has been a family friend since she was little. In each other, they find a place where they can grieve for the ones they cannot have, and they share a loneliness-driven physical intimacy. Will things stay like this for them forever?

Volume 3 contains Nyan-Nyan Oratorio:
The lonesome struggles of the only living being on Earth.

From Senpai Scans:
Yori, a boy who is bad at expressing his feelings, Haru, a girl who's his childhood friend and Subaru, his best friend. When did the three's relationship change...?

Like the star's light, our feelings guide us...
A sensitive four-chapter story that encapsulates our story where we, though clumsily, lived with our might.

Includes oneshots:
1. Bambi N' Lion
2. Toi tonari yori
3. Kotoriasobu wa ine wa koi o shiranai
4. Sorekara 3-nen-go

From Spttoon
After the suspicious death of her brother, Zena Han decides to continue her training to become a top matial arts student so that she can be accepted into a clan and obtain the coveted title of action idol. She transfers to a new school and soons finds herself barreling down a path where power and truth can be uncovered.

Shinozaki Mikoto is a student whose life is really routine. Going to school, going home, going to school, going home... nothing changes... until the day the girl he likes talks to him and introduces him to cycling. His life now has a new meaning, and a bright path has shown itself to Shinozaki. Experiencing both failure and success throughout his training, he works hard to become the best cyclist in the world.

In addition to "Love/Death", about a couple who clash over the limits of their feelings, Kuzushiro's latest volume also includes “Nicochuu”—the story of a delinquent with straight A’s and her admired sempai with a good bit of bark but only gentle bites.

A collection of short stories:

• Boketsu

• Taikutsu na Tsuki

• Johnny kara no Dengon

• Round Girl

• Nade-shiko

• Chinpa

• Jinsei Kaya no Soto (Kari)

Sequel of Endou-kun no Kansatsu Nikki.

The "after school love comedy" story follows Hana, a small, quiet girl who attends a discipline training all-girls school because she was attracted to the cute uniform. She secretly works at a fancy shop as a part-timer, and one day Hina, the school's super-slender beauty, joins as a new employee.

The Japanese government developed a military project where they created "Iron Princesses", schoolgirls who were altered to strengthen their body by replacing their bones with steel and artificial muscles. The Iron Princess are experts with the katana and are allowed to fight in the streets to determine the cream of the crop. Those who repair the Iron Princess are medical experts called Toui and they work to maintain and improve the girls. Sakuradamon is an academy built to train girls like Asami Honoka, an Iron Princess and Nagamitsu Yomogi, a Toui. Asami is a mysterious and powerful fighter while Yomogi is a medical child prodigy and they have to work together if they value their lives on campus.

Nanase Haruka is a sixth-grade elementary school student who loves connecting with the water and feeling the water as he swims, and he attends a local swim club together with his childhood best friend Tachibana Makoto and Hazuki Nagisa, one year younger than the both of them. Then, one winter’s day as graduation draws near, Matsuoka Rin transfers into Haruka and the others’ school from another swim club. Through swimming, Haruka strengthens his bonds with Makoto and Nagisa, as well as with Rin–at which point Rin, with his passion for the medley relay, suggests they form a team together and enter a tournament.

This is the novel that the anime Free! is based on in manga form at last! (September Scans)

15-year-old country girl, Suzume Yosano, has to move to Tokyo to live with her uncle due to her father's transfer. She bumps into a mysterious man who ends up taking her to her uncle's place after she gets lost. Turns out, Suzume will be seeing him a lot more often once she starts school because... he's her homeroom teacher!?

Included in the manga is a oneshot story called Tsuyu Kaoru (A Love Story in Moist Rainy Days) in volume six:
A romantic and melancholic love story behind a red umbrella.

From Yaoi Is Life:

Kadokura is the student council president. His father, who is the coach of the track and field club, allows various members of the track club to board in his home, an event that causes alot of stress for his son. One main source of stress is the ace Kima, who has a huge ego and constantly bothers Kadokura. While Kadokura has to deal with this until he graduates and leaves the house, suddenly, one day, Kima kisses him. Consequently, Kima begins to kiss and touch Kadokura, but Kadokura has no idea why. It looks like if things keep up this way, Kadokura might start thinking that Kima likes him...

Noboru Takizawa is your normal student. However upon being transferred to a new school the first thing that happens is that he steps on a land mine! From that point on, he fights against the hall monitor and gets past him. In the turmoil of it all, he meets the lovely Yukari and befriends her. Later on, he meets Ibuki, who later becomes his rival to win Yukari's heart.

It turns out that the school Takizawa has transferred to is trying to tyrannize the students of the class he's entered. It is now his job to try and help them out and keep their class! He does this by trying his best in showing the class has potential in a sports festival at the school. Meanwhile in the background, Takizawa's father is setting the teacher's straight and making them stop their evil ways.

The basic plot is that Takizawa transfers to schools where the teachers have messed up methods to deal with students, or schools where there are obscure and crazy rules. His father accompanies him and pretends to be one of the teachers to try and sneak up on the evil or corrupt teachers and end their tyranny.

Kenji Sakuragi is a poor lawyer and ex-motorcycle gang member looking for an opportunity to boost his career. His chance finally comes with the nearly bankrupt and notorious Ryuuzan High School, referred to as "baka gakkou" (stupid school) by some. There, he sets up a special class that aims to prepare students to take and pass the entrance exam of Toudai.

Won the Kodansha Manga Award for General Manga in 2005.

Eun-soo Cha is the main character of the story. Eun-soo has hated her Mother ever since she was abandoned by her. Raised by her Grandma, she became a wild child that likes to fight. She has even disguised herself so well as a guy that people won't believe her even if she says she's a girl. She can fight well, and is even referred to as hot by girls. One day, however, her Grandma's already bad health worsens, and she promises not to fight anymore. When Eun-soo's grandma dies soon after, she decides to leave Dae-Jeon (where she lives) and goes to Seoul to live with her Mother, despite still hating her, because she has nowhere else to go. There, she runs into one of the best fighters, at her new school, and immediately gets on his bad side. What will happen? Will she break her promise to her grandma? Will love bloom?

Based on the Korean Internet Novel, "암컷늑대의 BOY" by i쿠키i조아 (iCookieiLike)

A prequel to Freezing detailing the background and origins of Kazuha Aoi, Kazuya's older sister, Arnett McMillian and many other girls of Pandora.

From MangaHelpers:

Ignacio DaSilva is a world famous Brazilian karate expert turned soccer player who has been making headlines. His giant body and unusual speed has made him the number one player in the world by far. During his post game interview, he stated that there was someone with more talent than him and that he was coming back from Brazil any time soon. This left the media in a frenzy to find who this player was that was better than the great Ignacio.

Kensho is the son of a karate master who grew up with his next door neighbor, Satsuka, who was the daughter of a soccer coach. As fate may have it, Kensho became a great soccer player and moved to Brazil for 3 years while Satsuka stayed in Japan and became the scholastic champion in her division. Kensho comes back to Japan and attends the same high school as Satsuka. Little does the world know about the tornado that was about to hit the soccer community with the return of Kensho. [vyc]

Can the world change through the power of imagination!? Daisuke Yamomoto is an 8th grader who has Chuunibyou syndrome, but things get little bit out of hand as he was bullied and almost forced to commit suicide. He didn't do so in the end and discovered an app called "Arcana." Afterwards the mysterious figure from his imagination appears, and his imaginary world turns into reality.
[Batoto]

Official Webcomic

Haru has been in love with Soudai, his elder brother’s best friend, since he was a child. More than his brother, Haru chases after Soudai and even gets into the same club as him. He can’t be with him all the time, and if Soudai doesn’t look at him, he will feel worried but he can’t be honest at all.

Eventually, when Soudai becomes a university student, he leaves his hometown and he hasn’t contacted Haru once after that. He wants to forget Soudai but he can’t… Even though this love is painful but he can’t stop it―――?

Riku has been in love with Souta, his childhood friend, since the boy kissed him as a joke in middle school. He definitely doesn't intend to confess, content to stay by Souta's side as a friend. But Souta's behavior towards him changes after they spend the night out drinking. Riku can't remember what happened that night, and worries that he said too much...

Contains 3 pairings in total.