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.

From Chibi Manga:

Shinji, Manabu and Chinatsu are neighbor and childhood friends. Because they hide their thoughts from each other, their feelings became lock inside their heart. At that time, Manabu informed the other about "those things". He could trust his friends forever, but what will happen when they grown up and start to change the way they feel about it...?

Included is the oneshot: I Just Love You.

“Ah~ I want to fall in love!” wishes the handsome Sugisaki Mitsuru, who dreams of sleeping with the one he loves. And as fate would have it, Sorachi Ryuuji, a rather cute and very athletic senior, happens to materialize in answer to his prayer. The only problem is, Ryuuji is a late-bloomer and rather slow on realizing Mitsuru’s feelings for him, thus starts the angst story of pure love…

+ two extras

Side Story: Abunai Kurai Aishiteru
Kawashima Makoto knew being in love with his student would only lead to trouble, so he hid his feelings. But when Kaname confessed to him, he couldn't hold back. Now Kaname's failing grades make Makoto decide to cut back on their relationship, but rebellious Kaname doesn't take orders very well...

Volume 1
1-3) The Rumored Couple
Aoyama and Akabane, the president and vice president of the student council, are such a good match that there're rumors around that they're an item. Though both of them were supposed to be straight, everything gets complicated when Aoyama suddenly kisses Akabane saying it is an "experiment". As the experiment escalates, their hearts begin to flutter and their everyday life is turned upside down. If this goes on the rumour'll prove to be true... but is it really okay if things turn out this way?!

4) A Drug Against Unrequited Love
Every evening after work Sawano comes to shop in the drug store where Takimoto works. When Takimoto teases Sawano about buying energy drinks, hinting that Sawano might be needing energy during the night; Sawano blurts out that his love is unrequited. Who is the one Sawano loves?

5) Hanamaru Lunch
Everyday Hideki receives a lunch box from his childhood friend Shuntarou. Shuntarou wants to improve his cooking skills; but Hideki secretly wishes that the lunch boxes would be filled with Shuntarou's love.

6) The First Walk
The wealthy but clumsy Narumi is the master of his house since his parents passed away. He has a secret crush on his strict but gentle body guard Sakurai. When Sakurai's birthday is coming up he goes to shop for a present; at the same time the surveillance system set up to protect him breaks down.

7) The First Assistance
More about Narumi and Sakurai from The First Walk.

Volume 2
1-5) The Rumored Couple
The story of Aoyama and Akabane continued.

6) Selfish Recipe

7) The Father's Diary

8) The Secretary's Diary

The continuation of Miiko Desu!
This time, Miiko is in the fifth grade, and the stories have become more exciting!

This series received the 1996 Shogakukan Manga Award for children's manga.

From Intercross:

♥ Kiss to Koukai (Kisses and Regrets)
The distance between us wouldn't diminish. It's painful, lonely, and my heart squeezes in pain. At that time, if I had been more honest, would it change anything...? Yeah, right. That's why this time, so I won't regret it, I'll...

♥ Itoshii no Senpai-sama (Beloved Senpai-sama)
Hinako is the only girl to receive special attention from Katsuragi-senpai, the popular Kyuudo club president protected by his male club-member guards from all girls, not just fangirls. But Hinako's preferential treatment resembles nothing so much as a senior's spartan training of a junior. At first happy over how Katsuragi-senpai diligently takes time to teach her "many things," Hinako later questions why her so-called enviable position saddens her.

♥ Ikenai Koto (Something I Shouldn't Do)
Yui vehemently refuses to have her little brother's friend Haruka stay over at her house for the three days his parents are away...

♥ Kimi no Button Kudasai (Give Me Your button)
Yuki plays pranks on Tomoya because she likes him. Her last one before they graduate — writing Suki (I like you) on the back of his gakuran's second button. What is Yuki supposed to do when Tomoya says "Yes" to another girl before graduation?

♥ Kieta Hanbun, Nokotta Real (Half Gone, Love Remains)
A broken school festival sign and a common love for music makes best buds out of Naru and Yamato. That is until Naru loses all hearing in her right ear and she keeps her condition from Yamato a secret...

From Temptatious Taboo:

Normal high school student Riku comes back home one day to find... she is now the school chairman of a famous elite school?! It seems her grandfather left her the post after his death and, although Riku is not really enthusiastic about the idea, there happen to be two really interesting guys that attend that same school...

Also contains a side story called Kimi no Te to Hitomi to (Your Hands, Your Eyes) in volume 5.