Chopin and Liszt - both great composers, friends, and rivals. Liszt, after Chopin's death, Liszt remembers their meeting, their friendship, their lives together, and the music they made.

From Manga Abyss:

Hotaru managed to get in the same high school where Haruna-sensei teaches to see him again! However, on her first day there, she meets a very unpleasant guy who looks just like her beloved sensei...?

Asuka swore she'd leave the night life behind when her brother's job moved them to a new city...after all, it's hard to be a cat-burglar when you live with a detective! Despite her determination to move on, her talent for thievery hasn't gone unnoticed, and it seems her secret identity is not so secret! Approached and asked to join the group of chivalrous vigilante thieves taking the underworld by storm, Asuka has no choice but to accept...but can she keep her brother off her case?

A boy whose father fell prey to a book which drives its readers to take their own lives, a girl who tries to protect the boy from meeting a similar fate, a forensic pathologist who cannot forgive herself for the death of a girlhood friend, a mysterious used-book store - The Book Club - that only deals with books about death and despair, and a suicide which was committed in the ancient Library of Alexandria are all inexplicably connected in this unusual Korean horror story.

From ShoujoMagic:

Yori's attitude has changed. He and his twin sister, Iku, used to be inseparable as children, but lately Yori's been different -- eager to be apart from Iku. Iku worries that he hates her, but the truth is far more scandalous. Now, Yori would risk losing everything to have his little sister. Iku loves her big brother enough that she would never risk losing him, and so she'll do what it takes to keep them together... but Yori doesn't want to have her that way -- as a sister dedicated to her twin. Can Iku ever love Yori not as a brother but as a man?

Boku wa Imouto ni Koiwosuru received the Shogakukan Manga Award for shoujo manga in 2008.

Mitsuki's a high school freshman worried about her looks--or, at least, her "baby face". Until, that is, she enlists a little help from classmate Atsuki and her makeup kit. When Atsuki's finished, the transformation is complete--and breathtaking. It's also when the romantic adventures begin--a roller coaster ride of the heart that young and old are sure to enjoy.

There are 2 extra chapters in 1/2 Ceremony (1/2 series book 4).

A collection of six short stories:

1. Blue Moon Lovers
Blue moon... a phenomenon so rare, it's almost a miracle... Without thinking, Yuri tells the super cool bartender Rukia that she's fallen for him at first sight. Rukia rejects Yuri outright, but that's not enough to make her give up...
- From Sunny Side Up Blog

2. Karefechi

3. Koi Shoku Neiru

4. Kodou ni Kiss shite

5. Ikenai Kareshi

6. Boyish na Kanojo
Ayame, a popular idol who looks like an Ikemen but is actually female, has to claim she has no lover. In actuality however, she is going out with a regular guy, Nanase. But keeping both her idol status and love life in harmony may be harder then she expected...
- From Intercross

From ]Nagareboshi Manga:

Hijiki (a girl with an unusual name) has just entered a new school, and on the way there she encounters a mysterious boy alongside a beautiful lake. Hijiki has some secrets of her own, and will this boy be able to listen to her silent pleas for help...?

From Storm in Heaven:
Takatou Masaki is the second youngest of four sons, and seemingly a delinquent by nature. His hot temper has put a wedge between himself and his strict father, gotten him kicked out of one school, and tossed him at a school notoriously horrible for the one thing he's truly good at, basketball. A chance encounter with the willful Yuuki Kanako may serve as a catalyst for change, as the indefinable connection she feels with him draws them together.

Note: Won the Shogakukan Manga Award in 1988.

From Anime-tion Scanlation:

At age 17, Nana still doesn't have a boyfriend. One day, she went to the beach and met with a cool guy. They exchanged numbers and texted but the cool guy turns out to be her younger brother's friend who's 5 years younger?!

From Storm in Heaven:

Whatever Ozu Hayato was expecting when he went to his late grandfather's house for the reading of the last will and testament, it wasn't for his grandfather's old hat to fall on his head and allow him to see the ghost of a long-dead girl. Nor was it to inherit an entire office building, complete with a members-only hat shop. And who exactly is that man responsible for carrying out the terms of the will, and how does he know about the hat? And what's it all have to do with Hayato, anyway?

From Shoujo Manga Maniac: Kojima Mitsu (aka Honey) is in high school, but she's so small that she looks like she's in elementary school! One day while she is is changing into a maid uniform for a school event (with not much success...the uniform is too big for her), she find a little bat blocked by the window and helps it. Suddenly an awesome guy appears in front of her! He is a vampire and as thanks for saving his "toy," he helps turn her into an adult (with a kiss)...

From Storm in Heaven:

Matsumiya Kana lost everything when her father was arrested and charged with embezzling funds from the Japanese Ministry of Defense. However, she soon learns that her father actually worked for a secret organization within the Department of Internal Affairs, and was in charge of embezzling money to support it off the books. He was being used by an "embezzlement group" within the secret organization, and that group is willing to kill to keep their activities quiet. The life of his daughter, Kana, is the perfect blackmail to ensure his silence. Within a corrupt agency, where anyone could be a traitor, will Kana be able to avoid falling into the hands of those plotting against her...?

From NetComics:
Shinhye loves lying under the night sky with her father, listening to his tales of the constellations. And she dreams of a life among the stars. Little does she know that the stars may come down to her instead. Her journey begins when the department of science asks her family to host Sarah, a foreign girl with a unique talent. But, strange men are interested in Sarah and Shinhye doesn't know why. Unbeknownst to Shinhye, her every dream--and nightmare--is about to come true.

English Web Publication

A collection of oneshots. Bye-Bye, Little: Ai is a first year high school student whose father passed away when she was still in elementary school. Her immature younger brother is a pain, she has to do all the housework and it's awkward being around her own friends. But Takahashi-kun is secretly supporting her in the shadows... a story about growing up. Love, Stupid, Me: Chie wishes that her boyfriend Satoshi would show her more affection, but she knows he doesn't like the clingy type. The fact that she's hated by Satoshi's friend Sugiyama Sei doesn't help. However, it turns out that he doesn't hate her after all... Doki Doki Miyuki's in love with Shuntaro, but she won't confess because she's afraid of ruining their relationship. But when another girl confesses to Shuntaro, something begins to change... Too Young: Mika's mom doesn't approve of her relationship with Yoshiyuki, her boyfriend. In fact, she doesn't approve of anything she does, whether it be losing piano contests or getting Bs on her tests. How far will she go to protect their love?

Zhong Xiaoyin's (little seal) mother is seriously ill. To save her, her daughter needs a fortune she does not have. Luckily Lan Dongcheng (winter morning), the young and rich hospital director, offers her a mean to earn the necessary money. Why would he do that? Does he have an ulterior motive? And could it have something to do with the butterfly tattoo on her ankle? It looks a lot like the one embroidered on Dongcheng's handchief… Love and betrayal are waiting to be discovered in this new Chinese saga!

From Ochibichan.
Oukawa Nabiki is an energetic and cheerful girl who dreams to become a stuffed toy maker. Ever since she joined Kousei High’s Crafting Club, with Fukamachi Itsuru, a boy who dreams to become a silverwork designer, both of them work hard together to become professionals! But due to the fact that Nabiki has to attend extra lessons, she’s not allowed to do any club activity for a week?!

1-3) Bunbetsu to Takan
Aya has a great boyfriend Kento who treasures her a lot. But she is also attracted to Kento's older brother, who has a twisted personality. How come she can't stay away from him and she goes so far to cheat on her boyfriend? Will Aya's sense prevails over her sensibility?
From Jshoujo

2) Delusional Diary
Ui fell in love with the wrong guy. Jiro is popular and handsome, and agreed to date her, but he insists that their relationship should remain a secret. Ui starts to feel more uncomfortable about her love situation and her trust in Jiro is weakened by his cold attitude towards her. Is Jiro cheating on her or does he just have a very weird way of expressing his love?
From Evil Flowers

3) The Little Mermaid who Became a Witch
Everyone knows the story of the little mermaid who fell in love with the prince and exchanged her voice for a pair of feet. Did anyone wonder about the witch’s story and why was she so bitter towards the young mermaid? An interesting twist of the classic “The little mermaid”, this time, from the witch’s point of view.
From Evil Flowers

The fiance of the witch Meru is a sexy and wild werewolf?!

The witch Meru and her werewolf fiance, Riku, should have been married...but on the day of the wedding disaster strikes! A spell that the magician Nazo was casting accidentally hit Meru and she transformed into a little kid!! The only one who can return her back to normal is the one who cast the spell and Nazo has quickly escaped. What happens to Riku on the quest to find the missing magician? And how does their love stretch with Meru stuck in a little girls body? Will things ever go right for this unlikely pair??

Extras:

V.3 - Saigo no Onegai
V.4 - Renai Gokuraku Joudo
V.4 - Koigami - Love God

The tragedy of the feelings of the boys, gathered at the illusionary boarding school...

[Summary from Aerandria]