From Nagareboshi Manga:

Halfway
After graduation, a young couple must figure out what they'll do about their relationship now that they're going to different universities.

Kyou Dake no Unreal
A girl learns to cope with the death of someone she hated in her youth and comes to terms with that hatred.

Hoshi wa Hi ga Kureru Made Nemuru
A girl reunites with her childhood friend, only to find that he's quite different from the boy she once knew.

From Intercross:

The beautiful, white skin of high school student Ichijou Seika stole the heart of the young genius painter Manabe Akiharu. However, in order for him to paint, Akiharu must touch that "something" or else his image won't expand. While desiring to touch her, he worries that his thoughts will dirty her...?!

Contains oneshots:
Shoujo Kansen Ritsu
Senjou nite, Kotoba Nakushite

The time period is the 1980s where there's no tutors and no studies required at this time. What will the children of Seoul do for fun?

A male science teacher and a female school nurse at a local school live in the same apartment building. Sometimes she visits his room and they drink together. A situation arises that causes some awkwardness in their relationship. Will they be able to resolve things?

From Echochi Scans:

An innocent boy, who has spent his whole life sheltered from the world in a hospital ward, meets a mysterious young man, claiming to be an acquaintance of his father. The boy’s naïveté may very well save his life, but at what cost?

Kim Manseok is your average, everday guy but with one particular hobby: his love for high-end high heels. He owns his own personal blog and is known as a woman online but one day, his identity is exposed! Will he be able to continue his life as an ordinary salary man?

The series follows a young girl named Rakka, a newly arrived haibane (an angelic-looking being), and other characters in the city of Glie (guri), a walled city with one entrance where no one is allowed to leave. (See http://en.wikipedia.org/wiki/Haibane_Renmei for more.)

It also contains a side story written after the end of the anime. The story shows the relationships of Reki, Nemu and Hyouko after the departure of Kuramori. The colour illustrations are supposedly by Reki. One is a scenery in her dream and the other is the portrait of Kuramori.

From MangaHelpers:

A+ student Ichinose Taiyo is the brains of his class. His grades are always high, he's generally liked by his classmates and everyone thinks he will get into a good college then onto a financially well-off career. But his life long dream that no one else, not even his family, knows about is to be a manga author, which realistically speaking has near impossible odds of working out. The reasons why he keeps it a secret is because he'd rather not try if he's more than likely to fail and also because he doesn’t want to end up like his classmate Anezaki Runa.

Runa is also aspiring to be a manga author but is obsessed with it to the point where everyone keeps a distance from her because of her anti-social and weird habits. But one day, Runa finds out about Taiyo’s secret and forces him to pursue his dream. Taiyo learns that throughout his life, he has cared too much about public perception which will continue to limit his ability as a manga author unless he opens himself up even if it means rejection. With Runa’s help, he learns to believe in his dream and show his true potential. [vyc]

As a child Wataru and his grandmother used to pay visits to a shrine in their neighbourhood. While they prayed for each other's happiness, he encountered a snow-white fox named Yuki. Many years later, a sad occasion leads Wataru to pay another visit to the same shrine, but the Yuki who greets him there isn't quite the same one he remembers...

From Momocha Scans:

It is said that if you wear the suits from that store situated at the antique street, SHIDA, you will achieve success.

During a break in his work, interior designer Jouno Oumi visits the store and meets a frightening and blunt man. He is the legendary tailor, Shida. Seeing the appearance of Shida who takes pride in his work, Oumi begins to feel a longing for the man, and an attraction starts to form...

This is a love story between an obstinate interior designer and a hard-faced man.

Collection of short stories.

1) Haru Koi

2) Ring of an Unrequited Love

3) Misa's Eatery
Misa's parents own a western restaurant, but due to hating the effects of having bad skin from having to work there, she decided to move into the city and get a normal desk job. Now, completely indulged in her current job, mainly looking forward to after work hours where she goes on dates, she finds herself quitting her job and working at another western restaurant because of one of her visit to her dates day job...
From Girls' Generation Scans & Lively Scans

4) Nanatsu's Promise
From Girls' Generation Scans & Lively Scans

Valentine themed oneshot from 2008.
Full colored and 8 pages.

Not to be confused with the doujinshi Happy Valentine by the same author published in 2001 that parodies Kizuato.

In her university life, Lady Ayane has begun to keep bad company, or so it seems when the butler, Shinobayashi, is tasked to investigate the truth. As Shinobayashi tails her in secret, what he finds is that the lady is inappropriately playing alone…?!

Enjoy being a B**chi, a comedy endorsing a B**chi life!

A 4 page shot about girls reading manga at the beach.

When a fool lost his smile.When everyone around him are smiling through a lie.When the one he lives for laugh through a mask. The fool shall wish for a happy death.Original webcomic: www.shumijin.deviantart.com

After his divorce, the protagonist wants nothing more than to feel loved again. Then he remembers his friend, who's been carrying a torch for him since they were young and is currently a NEET, and realises he can have love, a new housekeeper and sex to keep his mind off his failed marriage all in one.

[From Fujoshi Bitches]
Close friends since childhood, Touma has a long intensifying unrequited love for Takaya.

"I want to be his princess", "He is my hero" - though he has a rough personality and mouth, Touma thinks like a maiden and is hurt every day by his own servile thinking and self-deprecation as he cannot express his love.

And it doesn't help that Takaya has gotten himself a girlfriend since starting university, and as Takaya's "nursemaid" and close friend, Touma can't avoid close contact.

At the same time, club senpai Yonezawa and a mysterious woman have gotten close to Touma; and here starts the harsh and painful changes in unrequited love for Touma---

"But my world is filled even with just one word from you."

During the winter, Yuichi was hospitalized due to hepatitis. Randomly he would try to escape from the hospital but would get beat up by the nurse. One day, he happened to meet Rika, a girl of his age, in the next building. He was fascinated by her beauty, but she was very selfish girl. Although she led him by the nose, he began to be attracted by her. However, when Rika told him about her illness, he knew why she acted so selfish; she didn't have long to live.

The story of German-American Anna and Japanese Saki, who live together as a couple in Los Angeles.

A string of stories about various people who live in the same town, and how their complicated romantic/sexual relationships connect them to each other.

Note: This manga has 10 chapters. Therefore, it is not completely scanlated as of 8th April 2017.