Miori is always fighting with her boyfriend, a middle-school teacher about her job as a hostess. After one such argument Miori goes out and ties one on and afterwards meets a young man who lends an ear and a shoulder... But then later on she discovers something quite unexpected...

From Midnight Scans:

1) Kimi no Hada wo Kowasu Yoru (Your Body Breaks the Night)
If you put a picture of yourself in the frame, you'll find love. If you put a picture of two lovers together, they'll soon marry. Maaya has come to secure a contract with Akihito Kiriyama, the glass artisan who makes these magical frames. However, she accidentally breaks a piece worth $50,000 and to pay back the debt, he buys her...?

2) Dear... Side: M

3) Dear... Side: R

4) 8 Jikan Taikyuu Koibana & Nanyakaya (Love Story of 8 Hours Endurance) [not translated yet]

Once upon a time, there was a little girl. One day she played a trick on a drunk and made him angry. The drunk was going to hurt her, until a boy appeared and saved her. It's been eleven years since that incident, but Nonoka is still looking for the "prince" who saved her.
This manga's got a love triangle and lots of judo!
Source: HMR

This tale of forbidden fruit is ripe with angst and taboo.
Nineteen year old college girl Kasumi is traveling in Italy after a painful breakup. In Rome, she meets a handsome Japanese man and, knowing nothing about him, not even his name, she has a one-night stand with him. There should have been no chance of them meeting again, but when Kasumi gets back to Japan, she learns that fate has played a cruel trick! The man she slept with was Yoshiki... her younger brother!! And that's only the start of it...

[From ShoujoMagic]:

Kahara Hitomi met Nagatsuki Atsuya when she was a child, and they made a promise to see each other again, but Atsuya never showed up. Because of that unkept promise, Hitomi hasn't been able to trust any guy ever since. Although Atsuya broke Hitomi's heart, she can't stop thinking or dreaming about him--even now that she's a college student--and she secretly wants to find her first love again. Then one night at a club, a man named Nagatsuki Atsuya appears before her! But is he the same Nagatsuki Atsuya...?

Shizuka, age 17, was raised by her mother, and the two are very close. However, the store her mom's worked hard to maintain was swindled by the Sakurasei Real Estate Company. Shizuka then, pretending to be the new wife of the president of Sakurasei, enters the Sakurasei family home while the president is away on business to get back the deed to her mom's store. In an instant she becomes "mom" to three boys, and the eldest son Kanon is the same age as her...

Nene, whose mother is known as a legendary hostess, is also working as a hostess. Meanwhile, a guy, who has his father’s charisma, made it as a newcomer actor. When they meet, love starts.
Nene has been a hostess for 3 years in Ginza, and she tries to struggle for her to be called the legendary hostess like her deceased mother. One day, a man suddenly called her. Even though it's their first meeting, Nene starts feeling deja vu. Since then, the two of them have to tamper with a cruel play. Is fated love about to begin?!
(Source: Midnight Scans)

Mizuka met a strange boy when she was 13. He was her first love. But when the summer ended, even if they promised to see each other again, Mizuka never saw him again. Twelve years later, Mizuka meet the same boy again. She's so happy until she found out that he has a twin brother...
(Source: Sound of Jewels)

Ami is a normal school girl. One day with her friends, she got stopped for an interview by a camera crew who thought Ami was really cute.
Shortly afterwards, Ami meets a blond boy who goes to her school named Nozomu. He seems to show some interest in her too. However, after she went to the 'Darwin', a group of two boy singers, concert, she met another Nozomu.
Very soon after the encounter with Darwin, she then got roped into the entertainment world as there were many people already interested in her from her live interview, who she later also became interested in.
(from MangaArt)

Ai was just a normal girl minding her own business when she met this guy. The guy was so poor and down on his luck that he couldn't even pay for his own meal. Ai took pity on the guy and decided to treat him out for lunch. What should have been a fairly innocent meeting with the guy turns rather weird when she decides to take him home and give him a place to sleep. That should have been all since the guy left very early in the morning and nothing untoward happened...but...is it possible? After how long, has she met the guy again?

Ayase Minori is a new student entering Houjou Designer's College. She has had her design "Daisy" stolen by a top-class designer Hinagata Eiji when she was 5 years old, and Minori had sworn to the fact that "I will not fall in love before I can beat Hinagata Eiji!" However, her meeting with Himemiya Akira almost made her forget her old vow...while Akira is Hinagata Eiji's only-son! (Source: Endless Dimension)

It has your average girl, with a childhood friend who's in love with her but won't admit it, and an older guy who likes her: a high school love story.

Although the whole school knew what was happening between Azusa and Ikumi, there were rivals who came between them.

Anzu Ogura is 17 years old. No boy tries to seduce her on the street, and she attracts no boys at parties. Her male acquaintances are only three Omihara brothers of the next-door family. Now she gets completely confused by them.