From Liquid Passion:

Yagisawa Kei is disastrously unlucky in love, as his recent strike-out with author Itou Haruya attests. When his publishing company makes him responsible for a handsome young author, he once again finds himself walking an all too familiar path where work and play collide. He doesn't realize that he has met Subaru before... or that Subaru's reappearance now will open old wounds from a past he'd rather forget.

From FairGame:

There is first time at everything, and you don't know anything about it. Not about your partner, not about yourself and even how to advance in love. In a certain port city, energetic high schooler Kana, and firm high schooler Kouki live. Two of them experiencing first time at every thing they do. Author of "Smash!", Saki Kaori presents, Hajimete Datte ba!. A heartful love story has now begun

From Nakama:

The person Aiba Misao loves is an onnagata in taishuu engeki, named Yumedono Ginnojou. He fell in love when he saw this person on stage, believing him to be a girl. Thus, when the plain Oosato Ginji is transferred to his school, he fails to recognize him as his much-admired Ginnojou. However, Ginnojou finds love, becomes even more enthralling and makes a big break in a commercial. A long-distance relationship, a frustrating love… Complications turn these two people into adults!

In addition to the title series, also included is a hard love story where East meets West on the streets of New York!

From Liquid Passion:

Heartbroken and lonely, Takeshi turns to internet porn for comfort, where a new AV actor catches his eye. Desperate to meet him, he tries to find out more about the boy. But the road to love is never rockier than when the object of your affections is in the porno trade...

This is in a series of four, that are sequels or direct spin-offs. The list is as follows:
1. Te wo Tsunaide, Sora wo
2. Amayakana Toge
3. Aisanai Otoko
4. Vanilla Star

A collection of stories.

From Yaoi Is Life:

1-2. Kami-sama Onegai!
Three months after third year high-school student Aobane started dating his classmate, Takahiro, he is constantly worrying if Takahiro might get tired of him. Because compared to Takahiro, who is cheerful and popular, Aobane is shy and a poor talker. On his first shrine visit of New Year, he prays to the god of a little shrine that he could be with Takahiro forever. The next day, he found he has cat ears and a tail…?!

3. Shiawase Delivery

4-6. Sweet Tears
Subaru and Masaya have known each other for almost a decade. However, Subaru's one sided love is making harder to be by Masaya's side. Will an unexpected confession from his friend change the course of their relationship?

7. Kamisama Onegai! +

Volume 1:
1) Secret Affair After 5 by Kasaki Takao

2) In a Dangerous Spot by Akigawa Keiko

3) Secret Lover by Mori Chiyono

4) Grant My Wish by Yamagata Kanan

5) Enchanting Kiss by Sawara Cashy

6) Love ♥ Spice by Shinota Michiko

7) Breaking Recipe by Higano Kotoko

8) Saon by Miyada Mutsumi

In a world where women are hunted as prey by an invading alien race, humanity requires all 15-year-old girls to have their left arms infested with a parasite that has defensive capabilities. This story follow two such young girls coming to terms with this reality.

The rich and powerful Sagiri Kaoru is taking Rin with him because Rin's father owes a one hundred million dollars to his father. Now, he can do whatever he wants with her. Can Rin show him real 'Love'?

Hinata has never had any experience with love for his 19 years of existence, and finally manages to snatch a date with the help of a classmate. With no experience with girls, Hinata asks help from his best friend, Yuuma, who seems to have had many experience with girls, who in turn teaches him how to seduce a girl, but then, something happens?

From Misty Rain Scans

Growing up in a strict old-fashioned household, Nanah has always been rebellious and outspoken. She dreams of living life as a normal teenage girl... But now, at the age of 17, she is forced to marry to a complete stranger! Prequel to Mok Yuna's Honeymoon Diary.

Adventures of Melty and friends that attend an academy in order to become questers!

From Alice Dreams:

Misaki Sakurako is a thirteen-year-old girl who loves ice cream and cherry blossoms. Living alone, she had a weird dream that told her she is the only savior to three young child boys... Strangely enough, she woke up to three handsome strangers who asked her to resolve their dear curse--their bodies will transform if they see any slightly "perverted" materials (posters, pictures, etc.). The only way to prevent them from transforming would be...?

From Panda Scans:

Sanjou Arashi is a serious and reliable second-year high-school student working part-time at a detective agency. Her boss is a gambling, irresponsible, tobacco smelling oji-san. The pair are complete opposites, but this is the story of a scruffy oji-san X high-school girl romantic comedy!

Ichina is a 2nd year high school student. She lives with her mother Youko whom she hates with a passion. After getting dumped by her boyfriend, she ends up having a one-night stand with her best friend Sekitani, who also recently broke up with his long-time girlfriend. Will they become more than friends? And who is the strange guy who's waiting at home with Youko when she gets back?

The desirable Tsuu-chan from Yogoreteru Hima Nanka Nai is a character in this story as well.

13 years ago, an unknown object appeared at Shinjuku. That creature regularly gives birth to a demon. Therefore, our world is being eaten clean.
The military found a weapon capable of fighting these creatures, a special power known as "exex" that becomes part of the human body.

From Chibi Manga:

Hiroko never had the experience of having a boyfriend. She started recently to lie to her childhood friend Tomoko who pretends that she had a lot of boyfriends...

Then Hiroko starts to have feelings for Takeru who's in the broadcasting club like her.
But when she tried to approach him at the school festival she suddenly discovers the truth...

Takuma Miyabe is a boy from an island who moved to Tokyo because his island doesn't have a high school there. However, the ratio of male and female is 1:9. There are too many female students in his class, and as a result, they "flirt" and torture the still innocent Takuma.

It is said, that one can achieve success but by being at the right place, at the right time. Is this really true?Shichiro Kurosawa is a 16 year old Highschool freshman, who is about to find out exactly what it means to be at the right place, at the right time, and the devilish cost.

1-3. After a stranger named Akio pays off Takuma's debt, Takuma finds himself working in Akio's shop, only to realize it's a host club. Takuma believes it's impossible for him to entertain women in such a way, but with proper guidance from Akio, he decided to do his best as an amateur host. Then one day, as Takuma tries to be more intimate with a customer in order to become a better host, Akio attacked him and said, "Do you want to sleep with someone that badly?"
Read on to see out what unfolds between these two men in this gorgeous love story.

4. Sakura and Raji are hosts who work together in the same club. Raji is the No.1 host and a total "King" with women literally falling to their knees begging him for love. Sakura is very nice, but totally cool, collected, and a bit pretentious. Raji keeps trying to hook Sakura, but Sakura is not going to just be thrown away like all those women...

5. Dental Wedding
A wedding agency consultant is desperately trying to match up a "perfect bachelor" with a bride, but maybe the bachelor doesn't want a female bride?

6. Extra
Extra of first two couples.

from fictiondb:
The billionaire's bedroom bargain...

Jack Maguire was turned away from his father's house and has never forgotten that day--or how much he wanted his stepsister, Sally. Now a billionaire tycoon, by a twist of fate Jack's inherited his father's property-- and has an opportunity to get revenge....

Jack has a bargain to make with Sally, who has grown into a beautiful, desirable woman. She can keep her beloved house...if she will be his mistress on weekends!