One-shot from Takehiko Inoue.
A coming of age story about acceptance and change in a girl's life as she comes to terms with her family circumstances. At a beach, she meets a boy who shows her things she's never seen before.

From Must Be Endless:

Plain, ordinary salaryman Kei has thrown everything away for a sex worker he’s fallen in love with. Trying to help her get out of debt, he’s made some bad investments. In despair over his own failings, he attempts suicide and nearly dies. When he next opens his eyes, he finds himself inside a sex establishment catering to gays: Circus. At Circus, four men live and work together while each of them searches for love and a way to live… “My heart depends on goodness, wherever it may come from.” Newcomer Asada Nemui’s long-awaited, 2nd comic!

From Evil Flowers:
A compilation of 6 sweet stories about finding love and learning how to keep it.

1) Karada no Iinari by SAKOU Watari
Uika Tonoda and Kuniyoshi Hazama are very experienced when it comes to sex….in theory at least. They know every theoretical term about sex, pheromones and all sorts of things related, yet neither of them has ever experienced it for themselves. What will happen when these 2 meet? Will they be able to leave the talk aside and finally take action?

2) Oni Kare by TSUKISHIMA Haru
Wakaba Endou only wishes to finish her driving lessons soon so she can get a driver's license. Although she thought it will be easy at first, nothing is easy when the one who's teaching you is instructor Kenzaki. He complains about every small mistake that she does and won't give her any points in her lessons unless she does them perfect. Wakaba always complains about the fact that he's so strict, but at least he's good looking.

3) Himitsu no Kinchan! by IWASHITA Keiko
What would you say if you knew that objects can fall in love? Kin-chan is the most popular mannequin in a clothing shop. Everyone wants to wear the clothes she's showing and even though she's just a plastic doll one day Haruto saved her from falling on the floor when she was pushed by the many enthusiastic customers. Even since then Kin-chan is not like the other mannequins because she has fallen in love with a human. What will she do when Moai-sama will grant her the power to be a human for 3 days?

4) Shuuren by MONOU Yuki
Nishimura Inori (17 years old) has given up on being girly after enrolling into an all-girls school. Since they barely get to see any boys, she and her classmates are so to called “boy hungry”. Yet still, they kinda gave up on the idea. They end up going to a very boring school trip to Nara and are pleased to discover that in the neighborhood inn, there is another class renting the place at the same time, from an all-boy school. So, this is it, the girls last chance to seek love before going back to school.

5) Rabu + Kuro Love&Clothes by TADA Manami
Matsumi Katou is a normal 25 years old housewife. Lately her husband has stopped complimenting her and she's spending most of the time taking care of her child and never to take care of herself. When she hears that she'll need to go to a party together with her husband she realizes that she's got nothing more formal to wear. In her search for a piece of cloth that will fit her she ends up at Aoi's shop, a manager who puts the happiness of the client before the job to sell any cloth to anyone. Will Aoi manage to make Matsumi look beautiful for the party?

6) Himikoi ~ Time Limit by Robiko
It's her last semester of high-school and Mako realizes she hasn't done anything memorable in all her time spent here. So she starts skipping classes together with Yoshi and ends up spying on other couples instead of leaving her own love story. But love comes in many forms and even tough Yoshi doesn't seem to take an interest in her she's still determined to have her high-school romance memories, even if that means forcing him to date her.

Shinonome Nozomi, a first year, joins her school's Astronomy Club in order to look out for shooting stars and have her wish granted. Her fellow member, Musashi Shouta, however does not want her around because she has disturbed his plans to live out a peaceful and private life in the Astronomy Club. Nozomi, however, insists on staying. Soon after, Shouta discovers that he has the ability to summon shooting stars at will by snapping his fingers. What will the two Astronomy Club members do upon making this discovery? And what exactly is Nozomi's wish...?

A collection of one-shots:

ch1) Kuchibiru Mellow (formerly known as Bisque Doll Replica)

ch2) Hachimitsu Neko

ch3-4) Mishitsu Funny Romance

ch5) Ningyo no Iru Keshiki
A guy falls in love with an aquarium diver at first sight, and he does his best to court him.

'Once noticed, it was...'

From the 1st year of middle school to the 2nd year of high school, Makihara Kai and Mizushiro Ren have been in the same class. But in the last year of their high school lives they are placed into different classes. A small ripple is born in the unchanging days that pass by... that makes the feelings they were unaware of start to bloom. Wanting to tell him, but unable to say it. The answer deep, deep within their hearts is...

The path of youth and high school boys unable to voice their love.

A spin-off from Houkago Play, this time it's about two girls who talk about their sex life, boyfriends or being a fujoshi.

This series is a set of several extremely short pieces: usually between 2-4 pages in length. They vary wildly in mood, character and art style, and the detail is often stunning.

Note: The manga was serialized in Kodansha's novel and manga fiction magazine, which does not targeted a specific demographic rather the general reader.

From justpeachyicedtea :

While spending Christmas without a boyfriend, an angel-faced boy grabs my hands and says “An angel…!” to a single 31 year old like me. Could this be a present from Santa?

Hiroto, a cook, picks up a 19 year old ikemen, Haru, from the streets and lets him into his share house.

From Chibi Manga:

The best gift for all girls is the most painful and awesome!

Older sisters are best friends, younger siblings are best friends. Among these like brothers there is a strange relationship.

Ayuta, a ronin with hopes of attending Geidai, fell in love on a packed train. Depicting his tempestuous and heartbreaking love with Haruhi, a psychiatrist eight years his senior, is this manga adaptation of the Naoki Award winning Murayama Yuka's best seller!

Kishi works in the anime industry but doesn't really like his job. During one of his regular disappearances, he runs into a rather mischievous cat who follows him home and begins stalking him wherever he goes!

Kanou is in love with one of his employees, the handsome Sawamura, who is really nice and popular. But Kanou is used to having bad luck in love, so he decides to hold back his feelings... But during a drunken night, events take a surprising turn... And Kanou realizes that the Sawamura he imagined, may be very different from reality...

The return of Class 4-2's Sadomi the sadist and friends! Laughter! Tears! Edutainment! All this and more! Let the nostalgia of your school days wash over you like a tidal wave of blood!

Toono-kun’s life has gone out of control, all due to a strange accident that he can’t explain. There was a flash out in the school yard where his younger sister Yayoi was doing track and field, and a number of people were injured, including Yayoi. Yayoi was lucky and got out of the hospital the next day – only she doesn’t act like herself anymore. What Toono has discovered is that his little sister is gone, and has been replaced by a soldier named Luca from 31 years in the future – and he alone knows it!

This is a tempestuous and heartbreaking love story about Ayuta, a rounin who aspires to attend an art university, who, in a jam-packed train, falls in love with Haruhi, a psychiatrist eight years his senior.

This is the manga adaptation of the Naoki Award-winning Murayama Yuka's bestseller.

Oono Chiharu and Kawahara Asami used to be a couple during their high-school years. When Chiharu suddenly moves away without a word, Asami is left with nothing but a broken heart and memories of first love that aren't quite so easily forgotten.

Seven years later the two meet again as career women; Asami recognizes Chiharu immediately, but the latter gives no indication that they've ever even met before. Furious and feeling as though she were betrayed all over again, Asami vows to give Chiharu a taste of her own medicine...