From Summer Rain:
Between three highschool students, a secret love affair begins..

In the Kincaid-ka no Yuigon Game Series (The Payback Affairs series):

V.1 - Boss to Hisho no Juunikagetsu (Shattered by the CEO)
All's Fair In Love...And Business

CEO Rand Kincaid had never been coerced--until his entire future was at stake. Under the stipulations of his father's will, Rand had to rehire Tara Anthony as his assistant. It was either get along with the one woman who'd dared to leave him first, or lose his family empire.

But before Tara would accept, she gave Rand her own demands. She wanted a second chance, with Rand back in her home and bed as her lover. And nothing prepared him for where this arrangement would lead.

V.2 - Itsushika Hanayome Kouho (Bound by the Kincaid Baby)
The affluent Mitch Kincaid's livelihood hangs in the balance because of his father's peculiar will. Unless he takes in his father's illegitimate child and looks after him for one year, Mitch will lose his entire fortune. The child is now under the care of its aunt, Carly. "I'll give you a hundred grand for the child. No-five hundred." Mitch offers Carly riches, but she refuses. She claims she doesn't need any money, and that she'll only cooperate on the condition that she, too, lives at the Kincaid manor. Dammit, what is she after? Does she intend to slink into his bed - and push him into marrying her?

V.3 - Nefuda Tsuki no Ai (Wed by Deception)
Ever since her husband died eleven years ago, Nadia has been busy playing and working to take her mind off things. Now, according to her father's strange will, Nadia is to shut herself in a Dallas penthouse. Her curfew is at midnight and she is not allowed to see any of her friends or go to work. If she disobeys these conditions, she will lose all of her inheritance. What is my father trying to do by keeping me locked in? Two months after this lonely and depressing life started, her penthouse neighbor, who has been away, suddenly appears in front of her. But the minute she sees him, Nadia faints out of shock!

English version via Renta!: Vol 1, Vol 2, Vol 3

After Shiori loses faith in her piano playing, she meets a weird Physics Professor who asks her to teach him to play the piano.

Mira attends a private school in England and finds out that the boy who appears in her dream since her childhood really exists. He's Radley Macchiavelli, a beautiful model. When the two finally meet, the boy is transported to a parallel world connected from one spiral ("Rasen"). Mira follows him to try to save him and is swallowed into the parallel world dominated by the mysterious Black King...

From NOIR:

This is the story of two siblings, Joo-won and Hee-won, and one man determined to take Hee-won's heart. Both Joo-won and Hee-won feel isolated after their parents separate due to infidelity and remarriage, placing both of them in new families. However, Hee-won's new step-brother, In-hyuk, notices Hee-won's suffering. Is he determined to take care of her, or is there something more?

An alien species wanted to start a revolution against their oppressors, and they think they may have found the power in humanity to accomplish their goals. They discovered that humans have latent superpowers, and so they began to abduct them and awaken their abilities. Unfortunately, the humans' abilities were not very useful for their purposes---at least not until they found the destructive power of #214.
#214 is actually a young woman named Hoshi Yumako, who has no interest at all in the aliens' revolution. The abduction and powers have seriously screwed up her life, and all she wants is to be able to live a normal life. Pursued by the aliens, she tries to work part-time and keep her powers from ruining everything. However, she knows she's not the only one out there; she might find allies among the empowered rejects of the aliens' experiments.

Prequel to the Gundam Build Fighters TV anime, covering how Yuuki Tatsuya got into Gunpla Battle.

The pastry shop Natsuki works at as a patisserie has been garnering a lot of interest ever since it was featured in a magazine article. The shop has been receiving tons of new customers – which was to be expected, except when one particular visitor comes in.

Vyalen, the main character in the story, is a graduating high school student from their school.Their school was pretty known as one of the best athletic and academic breeding students. In other words, only those who have special talents, elite minds, and abilities could only enter the school. Each of the students were categorized according to their major fields-- like being an elite, academic, and athletic. But, for the school's first in history they were not able to categorize Vyalen for whom he has this unknown ability that allows him to "artificially" use or create talents that he's not even used to... Moving on, within only 12 twelve days he will be graduating from his high school. That's why he is in a hurry for confessing his love to her long beloved crush, Trixy. But suddenly one morning, on his way to school, he suddenly bumped into a puny little nerdy girl named Lnear. having the thought that he had heard this name somewhere... later on. He finally realized that it was a classmate of his that must be sitting next to him that never came to school since the first day of class...

From Shoujo Crusade:

Yamada Chizuru was a normal high school student... that is, until her mother left for a "journey" leaving her with a debt of one hundred million yen! As if that wasn't nerve-racking enough, Kuze Mitsuru, the Umegaki gang's Sandaime, saves her by buying her to be his fiancee?! What will become of Chizuru's days?

Contains the side story Coffee is a Black Witch.

From MangaHelpers:
The end of the civil war signaled the start of the industrial revolution in the United States and immigrants from all over the world traveled to find their American dream. But what awaited the majority of them was poverty, discrimination, and hopelessness. Manhattan, New York was full of immigrants flooding through the ports and the 6th district, Five Points, was considered at the time, the world’s worst slum. The mobsters corrupted the entire area, including the police by paying them off; Five Points was the mob's territory and they were the law.
But even Five Points, where there seemed to be nothing but robbery, prostitution, and murder, showed some signs of hope. Luke Burns was an honest and righteous teenager who realized that the mob was the cause of their harsh lifestyle and that joining the mobsters would not bring him the American dream. But his older brother, Brad Burns, had become an assassin for the biggest mob group of Five Points, the Grave Diggers, a secret he kept from Luke for his own protection. Brad was known as the Grim Reaper and his reputation preceded him as a ruthless and skilled killer.

""Have we met?""Answer: a right hook Because Bryony Morgan pulls no punches. Even when she's very pregnant and facing down the father of her unborn child. She fell for wealthy hotelier Rafael de Luca when he courted her for her beachfront real estate. Then he disappeared. Now, she's in New York for answers--and she won't accept a brush-off.

From Fate:
Set in a fictional European country in 1924, a Japanese exchange student meets a mysterious, brilliant girl who only leaves the library to sleep. Her brother, a detective, relies on her mind to solve difficult mysteries, several of which draw her away from the library.

This story about the strange and fantastic stories that unfold around Nero, the black wizard, and Violetta, the clockwork girl.

From Manga Abyss:

Yoshino Haruka, 16-years-old, substitutes for her sister at an arranged meeting and ends up falling in love with Kunihiro-san... To discover the day after that he is her new home room teacher! How are the two of them going to deal with this forbidden relationship?

Oda Yuuma is an odd young man. He can float off the ground. He can see into the future. He scares the crap out of some of his classmates and teachers. There is a physicist trying to understand how he does what he does, but Oda-kun has his own agenda, and it involves a possible future he has seen of a girl from his school…

When the national idol Kusakabe Yuka suddenly retired from the entertainment business, it shocked the world and it devastated teenager Hata Kosaku. Kosaku was Yuka's biggest fan and her departure left him depressed. His classmates at the Tamo Agriculture School finally are able to get him to leave his room and attend his class, but to everyone's amazement, Kusakabe Yuka (her stage name) comes into the class under the name Kinoshita Ringo as a transfer student. Kosaku realizes he has the once in a lifetime opportunity to get to personally know his dream girl and, together with his group of friends, try to find out why she is here and become closer than just classmates.

Story 1: Himikoi (also included in Rabu Kare - Gokujou Men Dokuhon!)
What if the secret she could never tell was revealed, just before her high school graduation? To be able to face her feelings for Yoshii, whom she has a crush on, the two of them begin a secret game in their secret place. With the last day of school impending, what will be the outcome to her love...?

Story 2: During a Stormy Night
After losing her cellphone, Nao is only hoping that someone nice enough would pick it up, but much to her surprise, the person who finds it is the guy from the video store near her house. Too shy to go and reveal herself, she starts communicating with him solely over the phone.

Story 3: The Glass-bead Bridge
According to the old legend, if you dig out a glass-bead from the famous glass-bead bridge, your love wish will come true. That's exactly what Niina is trying to do during the cold winter time. Every night going to the glass-bead bridge and slowly digging, she eventually gets spotted by her old middle school classmate. Not promising to even meet up once, they still keep seeing each other every night by the glass-bead bridge. Will Niina's wish come true?

Story 4: The Red Turtle's Dream
"I like Sensei." Riku is loving him one-sidedly, but Sensei, who is very self-centered, doesn't even try to accept others. It is only during the short time while she's looking after his pet turtle, Kamekichi, that she feels closer to him, but Sensei's emptiness can't be filled with anything. She wishes for him to find happiness, even though she knows she can never be the one to fulfil it.

Story 5: A Perfect Day for a Picnic
A broken family can only find comfort in a family that went through the same problems. Years pass and people grow old. Some grow into wiser adults, some into young adults, and some into teenagers; teenagers that become interested in love and feelings. Their nervousness and awkwardness can lead to an uncomfortable situation, one that may make them regret what they did. Are love and feelings stronger than family bonds?

Story 6: The Hideout of Those Two
Thanks to her constant bluffing, Chi always spends her days on her own. Her only solace is the secret hideout from her childhood where a kind and protective Nii-chan used to live leaving her with a key and a promise. Will he really come back and when he does, what will change for Chi?

The history is about a half japanese, half italian man in New York, who works as a contract killer for the mafia

Nobody know where it is, but it's a place that offers shelter to those who hate their lives or are trapped in the labyrinth of their own hearts... a mysterious hotel. Even now, those who are tired of their lives come to stay in the "Kiri no Mori" Hotel...

In 2012, the author released another chapter, not yet included on a volume, as part of the 35th anniversary of Petit Comic.

In her Ay (Aniversary Box - 2013) the author wrote that this work is unfinished.