From Midnight Scans:

Rin and Hiro are childhood friends. The truth about Hiro’s love that he can’t confess is…?

Note: Original language image is unavailable.

Rin is always sending messages with her phone and doesn't speak to anyone. Even though she's like that, Taka got interested in her and keeps on following her. But why doesn't she want to look at him...? And who is this mysterious person with whom she always exchanges messages with...?

From: Winter Translations

My childhood friend who loved messing with me moved away 10 years ago but now he’s back. My everyday life is filled with sweet despair!

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From Shoujo Crusade:
Ichino is a high school girl who absolutely hate guys due to the fact that her father betrayed them when she was young; stealing all the valuables that she & her mother possessed & disappearing without a trace. Since then she has vowed to become strong so she would not lose to any man. She has also longed for the day she could meet the lady from a fateful encounter in her childhood.

One day, she accidentally beat up a guy who she mistook as a pervert pestering her friend, Miyabi. She tries to apologize but ends up beating him up even more.... She developed a distaste for the guy and two of his friends as they bump into each other once again resulting in more misunderstandings. Ichino personally believed that if she came across the same person thrice that would be considered 'fate'...

Coincidentally, the start of her school begun with a surprise as she found out that all THREE of them turned out to be her new classmates !!

Nanri Ryusuke has transferred schools three times this year because of his parents’ divorce and he is determined to make a good impression at this new school because it appears that he's staying for good this time. However, his seat is in front of the weird girl in the class, Fujimori Miya, who claims she is a witch and who everyone in the school avoids. Miya, for some odd reason, takes a creepy interest in Ryusuke and makes him the subject of all her crazy experiments and spells.

The series is on hiatus since late 2012 due to the author's health issues.

Skipping class on the rooftop one day, Shunpei's best friend Fumi tells him he thinks he might be gay. All set to freak out ("Then up 'til now he's been thinking that way about me?!") Shunpei's a bit nonplussed when Fumi's confession turns out... to have nothing to do with him at all! In fact, Fumi's already going out with someone else. Cue adolescent meltdown.

Also contains a continuation of Otona Keikenchi.

Life is a comedy when seen from afar, and a tragedy when seen up close.

Because the way people have a high interest in "sex," a sex school was formed in order to fulfill the students' desires and help them become more advanced in their skills. Ion, in order to help pay off the debts in his family, has enrolled in the school, hoping to gain knowledge and sell out his body in the future to gain money. But Ion gains more than just "knowledge" in the sex industry, and he starts to fall for his Instructor Asagi... but love is strictly banned from the school...

Josh is a 15 years old Bully who have been expelled from his highschool for hitting a student who threatened another student. Thereby he was thrown out of the house by his mom. Now he's trying to get into a federal agency named The SCB.

Hayama Honoka, a freshman at Asaka High School, is an easygoing, unmotivated teenage girl that seems to be unaware that she is more interested in girls than boys. Tomori, her best friend since middle school who is a little violent at times, reminds her that she must pick a club to join at school. Soon after, during the lunch break, Honoka sees a girl wandering the old, abandoned campus building and meets a shy and clumsy girl named Mizusawa Yuzuki who finds fascination in the building that is several decades old although, Honoka only sees it as dirty. Honoka and Yuzuki learn about a small school club called the Abandoned Building club. They meet the vice president of the club, Tachibana Mana, a very passionate and nicely-figured girl, and the two girls decide to join. The club’s purpose is to visit abandoned buildings, rooms or stations and see the beauty of the place that has been forgotten but which is full of history, places that are worn out by time, forgotten by people but filled with hints into the past.

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From Blissful Sin:

After stomach cramps land Muramachi Koharu in a bed at the nurse’s office on the very first day at his new school, he suddenly wakes up to find himself on the landing just before the roof door. And there’s a student he doesn’t know sitting right next to him!
“Where am I? Who are you?”
The student says he’s one year Koharu’s senior and leans closer and closer to him…!
He pushes Koharu down… And suddenly kisses him!

A romantic comedy that tells the story of the faithful yet stupid senpai Oosugi and Koharu, a transfer student who’s too nice to say no. ♥

A 4-koma set in the "school" at the Alnus base.

"I've liked you for a long time. Please go out with me!" These were the words second-year high-school Kazuki Yugawara heard when one day out of the blue, someone confesses their feelings for him! But, wait just a minute… I go to an all-boys school. And the one who confessed to me was Sakurada-kun, who… is also a boy! I’m happy someone told me they liked me, but there's no way I could ever go out with a guy! But this guy Sakurada looks like a girl. What to do?

From Chibi Manga:
The kind homeroom teacher, yoshino sensei, is actually has a black heart! sensei is quietly meddling in here and there of suzuki's school life who accidentally find about his secret. tsundere high school girl x wicked teacher, secret lovey dovey school life!

A freshman in college, Amano, is taken a liking by a mysterious senpai, Kamishiro, who raises chicks. When Kamishiro hugs him out of nowhere in their first meeting, he thinks this senpai is crazy, but as he spends more time with him he sees how kind he is. But one day, while Amano is playing with the chicks, Kamishiro kisses him out of nowhere! An airheaded research student and a kuudere freshman's love story.

Hokuto Kuzuhara is a delinquent known throughout Sekai Private Academy. His way of life being so hated by his family that they give him an ultimatum: find a girlfriend within a year or move out. That said, though, months pass and he still has had no luck and it seems like he never will. It is then during this predicament that he is approached by the student council vice president with a plan that would both save him from moving out... As well as help her with her revenge.

Hito Natsu no Kids Game (ひと夏のKIDSゲーム Hito Natsu no KIDS Gēmu) is a short, debut manga work by Ken Akamatsu, the creator of Love Hina. The manga was published on September issue of Kodansha’s Magazine Fresh on September 10, 1993. Ken Akamatsu later received Kodansha’s "Freshman Manga Award" (Japanese: 新人漫画賞/少年マガジン新人賞) and Special Jury Award (Japanese: 審査員特別賞) for this work.The manga was re-published on 20 May 2001.

(Description taken from Wikipedia)

Someone is trying to kill Maejima, the unassuming Archery club adviser and Math teacher at Seika Women's High School. What appears to be pure, dumb luck has gotten him through several attempts unscathed, but he has no clue as to the perpetrator and the Principal would rather not involve the police in what's "surely just a student acting out". With the entire faculty and student body as his suspects, Maejima struggles to discover the culprit before his luck runs out.