High school student Toudou, a handsome, womanizer who always gets the girl he aims for, ended up making a bet with his bad-boy friends about getting Miura, the school nurse, who’s a good-looking man who might be gay. Toudou will make up any excuse to shorten the distance between him and the one in the school infirmary. When Toudou finally tried to lay a seductive kiss, Miura’s usually quiet and gentle expression changed completely, and the nurse changed the kiss to a bold and deep one!?

Yuzuki Eba has mysteriously decided to go to high school in the countryside. But despite Haruto Kirishima's objections, she is living in his home. Now he has to put up with a freeloading city girl and even worse, make sure Nanami Kanzaki, the girl he likes, doesn't get the wrong idea!

The story's setting is based on author Seo Kouji's hometown.

Mahiru is a negative girl, who always feels that any stroke of fortune will create a corresponding misfortune. She only wished to live her high school life in peace, but instead she catches the eye of a handsome prince. Laughter, tears, and shortcuts?! An ultra-miracle love story begins!

(Source: Anime News Network)

From Shinmakoku Scanlations:

One day, Shirou got a love confession from a pushy boy named Kuroda. Kuroda reminds him of his dog, from a long time ago. The younger student poked his heart in places he'd never suspected.

A boy named Shiina Masaki has a crush. Except, the person he is infatuated with disappeared three years ago and he hasn’t seen her since—for three years he has saved himself for that girl, Nagi. Much to the frustrations of the female populous in the school, he has remained unmoving in his devotion. One day a pair of twins transfer in, one male and one female, both named Nagi! Shiina is distraught—he is smitten with the female Nagi, but turns red at the sight of the male Nagi. Will he ever get his emotions straight or will his life be filled with teenage angst?

For a shy boy and an energetic girl, love starts at their part time job!

Mika is heartbroken when Kouhei tells her that he wants to break up with her. Mika asks him out on a last Christmas date before they break up and Kouhei agrees. But it seems that Kouhei is hiding something from Mika...

Fujimura Kaoru is the nurse at an all girl's school and, for the third time this year, she has been confessed to by a student. Naturally, she has turned down each offer in the kindest way she could. Isechi Mikoto is a student who has been ostracized by the school because of a rumor that she might be a lesbian. She also happens to remind Kaoru-sensei of her former lover.

Don't let your human scent linger. The intense story of Phantom Highschool, starring Ingan Kim who was just placed as the homeroom teacher of room 8!

Natural airhead Chiho Sakuranaga entered an all girl's high school due to a misunderstanding. Before the entrance ceremony she ran into a puzzling, but beautiful boy like girl. Later the school president smiles at her and she can't stop the sudden pounding in her chest. Though self-proclaimed straight thus begins her yuri life.

Hachimitsu Private Academy was a revered and elite all-girls’ boarding school on the outskirts of Tokyo…once upon a time. But with the new school year comes a revision to school policy: Boys are to be admitted into the student body for the first time ever. But on his first day at Hachimitsu, Kiyoshi Fujino discovers that he’s one of only five boys enrolled at the school. Their numbers overwhelmed by the thousand girls in the student body, is it heaven or hell that awaits these five (un)fortunates?!

Note: Was one of two winners of the Best General Manga award alongside Gurazeni at the 37th Kodansha Manga Award in 2013.

Moriya Komachi has a crush on the student council president, the handsome, gentle and perfect Hasumi Sakuya. She even joined the student council in an effort to become closer to him. That's why she was really happy when he proposed to her! However, it seems his gentle personality is a mask...

Consists of three stories:

1. Aquarium
2. The Flying Stewardess
3. The Heart is Your Kingdom

From CPM:
Three tales of love, loss, and longing.
A trio of girls tackle the trials of adolescence and try to find happiness.

Yuu Haruna just moved into town and loves to be on twitter. Out on his way to buy dinner he bumps into a mysterious girl, Fuuka Akitsuki, who breaks his phone thinking he was trying to take a picture of her panties. How will his new life change now?

Many Shonen Jump characters have big dreams, but this character's big dream is a nightmare! A very realistic reoccurring nightmare where a giant monster destroys a city. And it always ends with Ko, the poor dreamer, getting crushed under the rubble. But when Ko meets an unusual man who somehow knows about the monster in his dream, his nightmare takes on a whole new meaning.

From asdf scans:

In order to live a normal high-school life, Mirei started her first part-time job. But after receiving her first paycheck, she almost kills a highly-ranked bishounen…?! An encounter with a super poor and pessimistic innocent girl, is this a beautiful miracle?!

From Chibi Manga:

That was the first time I fell in love. The first time I met "Leopard-kun", time stopped and I could not breathe. My heartbeat became louder and I could not take my eyes off of him. Although Leopard-kun told me "he wants to be with me", he is a guy who has kissed many girls. This love has many difficulties... it's tender yet painful, but even so I can't stop my feelings for him. I'm sorry...I fell in love with a "beast". This is my first love.

Tezuka Kanna, 15, is a girl who loves manga. For that reason, she specifically enrolls in a course for manga in Tokiwa High School as a freshman! No one knows though, that she is already a debuting manga artist. ...But wait, what's this?! Three handsome guys suddenly appear, and what's more they know!!! Kanna (God) vs. Those Guys (Devils)!!! What would happen next?!

Anthology Comic of Slow Start