From FairyFly:

Tsuzuki Rika has just started her high school life, hoping to have a "sweet love". But she fell in love with a senpai, who's in love with another girl... no matter how hard she tries, her love is unlikely to be returned... sweet, yet painful adolescent love.

Enter Hikawa Naomi, son of a music critic and Ebisawa Mafuyu, a young prodigy pianist who suddenly disappeared from the music world.

Hime is a natural blonde and with that comes basic expectations: for her to excel at everything and to speak English proficiently, and unfortunately to be a complete ditz and have many boyfriends. When Minami catches her studying English by listening to 'English for Dummies' the two become friends. But soon Minami falls prey to the rumors and distances himself from Hime. Will the two ever be able to regain their friendship?

From Angry Fox Scans:

The story is about the Himenokouji twins named Akito and Akiko who got separated due to certain circumstances and after years of living apart they suddenly began to live under the same roof once again. Things were fine at first until Akiko began expressing her love for her older brother. Now Akiko must fight to defend her extraordinary love for her Onii-chan as she battles against all odds and three other girls who are after her beloved Onii-chan.

From Hochuuami:

Prince Ashide decides to agree on a wife, but too bad for him a lone deserter of the country of Ishugal shows up instead to claim the title of Princess.

extra story: Beloved Affair
The older son of feudal lord of Crimson Country, Nagi, loves the surly/arrogant spy, Kari. Kari who always refuses Nagi's courtship happens to know that Nagi loved the lover of his father who had same red eye like Kari. Kari feels anger for Nagi who loves him as substitute...

beginnning with the Bloody Valentine War between Earth and the colonies,On one side is the Earth Alliance, and on the opposite is the space colonies that form ZAFT (Zodiac Alliance of Freedom Treaty). Mankind is divided over human genetic engineering, with normal humans known as "Naturals" and the genetically altered humans known as "Coordinators".While ZAFT has a head start on mobile suit design, the Earth Alliance quickly catches up with its five prototype Gundams. With ZAFT having stolen four of the prototypes, young Coordinator Kira Yamato pilots the GAT-X105 Strike Gundam and is forced to fight his old friend Athrun Zala. Little do they know that there exist sinister forces working to bring about events that go far beyond their worst nightmares. -Taken From Wikipedia

In the Kekkon Kirai no Sankyoudai series(結婚嫌いの三兄弟; The Three Marriage-Hating Brothers), also called the "Billion-Dollar Braddocks" series:

1) Onzoushi no Yuuutsu (御曹子の憂鬱; The C.E.O.'s Unplanned Proposal):
When Adam, the oldest son of the wealthy Braddock family, asks Katie to be his party planner, she is taken aback. Doesn't he know that she's just a waitress? Adam's zeal eventually wins her over and she agrees to the job despite the misunderstanding. Katie is surprised to see Adam's gentler side during their time together, but still, with his cold, businesslike nature, it can't end well…or can it?

2) Koi wa Butoukai de (恋は舞踏会で; The Playboy's Office Romance):
The career-driven Lara can't believe that her new boss is the spoiled playboy son of the wealthy Braddock family. As a professional, she cannot accept the idea of someone like him running the company, so she marches into his office with her letter of resignation in hand. But Bryce pleads with her to stay, and somehow Lara can't argue with the sexy glimmer in his eyes.

3) Lady e no Kaidan (レディへの階段; The Blacksheep's Arranged Marriage):
Thea is the ugly duckling of high society. Shy by nature, Thea has never had a chance to blossom from under her grandmother's thumb. Thea has admired Peter Braddock for years, and agrees to let him escort her to a ball one night, but the two of them get soaked in a sudden downpour on the way home. She lets him in to change and dry off, but when her grandmother sees the two of them undressed in her room, she jumps to conclusions and sets in motion a huge scandal that will shake both of their families to the core!

English publication via Renta!, part 2, part 3

Himeno's chest hurts if any boy touches her because her heart is a diamond. However, when she was young, she befriended two boys--gentle Mamoru and blunt Keigo--who could touch her without harming her. Without knowing about her diamond, both Mamoru and Keigo promised to protect Himeno. When some people threaten to take Himeno's heart, who else will protect her but her knights?

From Nekohana:

It all starts when Tomoe's hair gets caught in Kouga's button. As if by a red string of fate, they're tied together. Through a twist of that fate, Tomoe is forced to work in a house of prostitution lead by the yakuza, and who might be one of the yakuza heads, but Kouga.
Funny and dramatic, but more innocent than you think.

Good Ending follows the main character Utsumi's interactions with Kurokawa Yuki, a member of the school tennis team, in order for Utsumi to confess his feelings to the captain of the tennis team.
It is implied that the title of the manga is derived from the "good endings" that are achieved in visual novels.

Story 1. Boy Next Door
Takeshi is straight until he sees Kazuya lying naked on his friend's couch. After their intimate encounter, can they find a way to make a relationship work and manage to survive on their unusual part time job?

Story 2. One Heart
A story about a part-time, student worker and his ex-salaryman boss. When his boss's company is in danger of going bankrupt, how will the part-timer convince his ex-salaryman to take a loan from him?

Story 3. Otoshimono
An odd encounter between two strangers results in tales of violence of questionable validity--and of course sex. But is this just a one night stand?

Story 4. Long Way Home
Katou has money problems, loans and he hasn’t paid his rent for 5 months now. When his realtor Yui suggest that, if Katou does a job for him, he will give him 3 more weeks to pay the rent (before kicking him out or worse), Katou happily agrees… (Yui appears also in Night Walk)

Yuusuke is a guy who loves flat-chested girls. On his first day in high school, he meets the girl of his dreams who is also his sempai, named Momoka. She asks him to join her club, which is in trouble due to the lack of members. Despite his childhood friend’s warning, he decides to join the notorious and mysterious club…

Mizumura Shinta didn't know what to make of the situation when the sexiest girl in school, Kishimoto Ririsu, starts seducing him and things get extremely physical. Shinta isn't rich or the popular guy in school so it doesn´t make sense that Ririsu would be so interested in him. But Ririsu is in fact a vampire, a secret that she will kill to keep hidden. As the relationship between Shinta and Ririsu grows, it gets harder for her to keep the secret hidden from him. And when those close to him, like his semi-romantic childhood friend Makimura Chizuru, are involuntarily thrown into the chaos, deep dark secrets get revealed.

Yamada's parents have gone abroad. Worried about him staying alone, they hired a maid to look after him. The problem is that the maid seems to be a delinquent who takes her job very seriously. Nothing will stay the same for Yamada anymore.

Tachibana Tsukumo, a girl who cannot feel pain. Yao, an immortal boy whose only wish is to die. What will happen when these two meet...?

Yutaka gets his yearly letter from his beloved older brother, but this summer something is different about it...

"Magic" is a product of neither legends nor fairy tales. It has become a technology of reality for nearly a century. Various countries in the world are locked in a race in nurturing Magicians.

Shiba Tatsuya is a reserve student with poor magic ability at First High School, a magic high school along with his sister who happens to be the top student among the freshmen. What will happen to him? How will he live his school life where he is one of the many reserves in the school looked down upon by the chosen magical students?

(Adaption of Light Novel v01-v02)

Kyouichi's indecisive character has led him to repeatedly commit the foolish mistake of adultery. One day, Imagase, a college classmate he hasn't seen since graduation, shows up as the private detective hired by his wife to investigate his infidelity. Imagase, however, proposes a deal. He won't tell Kyouichi's wife about his affairs, but, for compensation, he makes an unbelievable demand: "I want your body in exchange..."

In the second edition, there is an extra chapter.

Kataoka (male) and Sato (female) have been friends since they were little. Kataoka has much better hearing than the average human, and he says Sato's voice is the most noisy of all. He has grown into a teenager able to hear everything from far around him--the good and bad. Now that the two of them are teenagers, Sato is affiliated with the school newspaper club, and Kataoka has mostly isolated himself. When the newspaper club decides to look into the truth behind some 'supernatural' rumors, Sato manages to convince Kataoka to lend the club his abilities.