From Syuura:

During a field trip to the imperial capital, Tokyo, Kaga Nanao overhears the beautiful melody of a violin and immediately becomes captivated by it. In order to meet the mystery violinist, Nanao learns the violin and defies her father's wishes by attending the Marianne Music Academy for girls in Tokyo. Upon arriving at the school, Nanao comes across her mystery violinist who turns out to be Sagami Takenomaru, the violin prodigy and adopted son of the famous violinist, Sagami Chougo-sensei. However, Takenomaru isn't just a regular person, he's determined to complete a mission and fulfill a contract...

Note: "Naki Shoujo no Tame no Pavane" means "Pavane for a Dead Girl" and is a wordplay on the Japanese translation of a solo piano piece, written by French composer Maurice Ravel in 1899, called "Pavane pour une infante défunte" - Naki Ōjo no Tame no Pavane or Pavane for a Dead Princess.

From Fantagraphics:
A DECADE-SPANNING JOURNEY INTO DARKNESS
Even as butterflies ominously proliferate in town, the rumor of a mysterious creature lurking in the tunnel behind the school spreads among the children. When the body of Arié Kimura's mother is found by this tunnel's entrance, next to apparently human traces, the legend seems to be confirmed. Is the end of the world coming? In order to appease the wrath of the beast, the children decide to offer it a sacrifice: The unfortunate Arié, whom they believe to be the cause of the curse, is shoved into a well that leads to the Nijigahara tunnel — an act that in turns pushes Komatsuzaki, the budding thug who has carried a torch for Arié for a while already, entirely over the edge.
But this is only the beginning of the complex, challenging, obliquely told Nijigahara Holograph, which takes place in two separate timelines and involves the suicidal Suzuki; Higure, his stalkerish would-be girlfriend; and their teacher Miss Sakaki, whose heavily bandaged face remains a mystery; and many more — brothers, sisters, parents, co-workers, teachers, aggressors and victims who are all inextricably linked to one another and all will eventually — ten years later — have to live with what they've done or suffered through.

A collection of short stories. Note that the vast majority of these stories contain heterosexual romance themes. A few stories explore transgender issues, but it's a stretch to call them shounen-ai or BL romances. This series demographic is josei.

Le théâtre de A
1.Oeufs D'ange - Tenshi no Tamago
A man is asked by a young painter to be her model.

2. Velvet Going Underground
A doll becomes a super idol. Hijinks ensue.

3. Childhood's End
Alastair runs away and meets the Rabbit.

4. Bite Me Something
Allistaire followed Mr. Rabbit all the way to Wonderland. Will he be able to find him among the crowd?

5. Long Along Alonging
A girl asks a vampire to be his apprentice. But what is her motive?

6. Till Dawn
In a dark tower, a caged voice is singing until a hunted man enters the darkness.

7. Leçon un
Sequel to Long Along Alonging.

8. My Skin on My Back

9. Highland Walker
Sequel to Leçon un.

10. Perfect World
The story of a young wife whose husband is infected with a fatal disease called Flower-Blossomitis.

11. Perfect Lady
Sequel to Perfect World and drawn especially for this book.

12-13. Looks Like a Teaspoon
A boy named Allistaire is often teased at his all-boys school. One night he dresses like a girl and stumbles upon the boy who often bullies him, Simon. Allistaire runs off into a tower and as Simon runs after him, we see the sign "Welcome to Wonderland" hanging by the tower's door.

14. The Pearl Blue Story
Do you believe in mermaids? Coggy, a young boy finds a mysterious lady laying down near the shore of the beach. He brings her home to help her.

15. I Am a Piano
A piano tells the story of her life and the people she encounters.

16. Parade

Le théâtre de B
1. Noël
A short story about a holiday romance.

2. Teddy Bear Satsujin Jiken (The Teddy Bear Murder Case)
Four murders have taken place at an all girl school. Lying beside each of the victim was a teddy bear with one missing limb.

3. Yonshimai Satsujin Jiken

4. A is for Alice
Alastair, a grown man, is off to follow the Rabbit once again to return to Wonderland.

5. Nedai no Musume Atelier no Musume (The Bedroom Girl, The Sculpture Room Girl)
A story about a girl in her death bed finding another chance in life in the body of a doll.

6. B&W (Black&White)
A story about a boy waiting for his sister.

7. Le Jardin du thé (The Tea Garden)
A mysterious story about a poor young man who orders a kind of tea called Huan Ying – “The Illusion”.

8-9. Free Fitting for Her
A priest and his captured vampire must save a naive and selfish young girl from the murderous desires of a Lolicon. But perhaps this girl isn't all that she seems.

10. Rose Dusk, Pale Moon

11. Hello, My Sister

12. The Happy Prince

13. Welcome to Wonderland
Simon, Alastair's old classmate, is now a grown man who bumps into his childhood Wonderland traveller.

Ten years ago, they took him. He doesn't know who. For ten years he has been confined in a private prison. He doesn't know why. For ten years his only contact with the outside world has been a television set and the voices of his jailers. In time, he lost himself. He changed...transformed himself into something else...something hard...something lethal.Suddenly, one day his incarceration ends, again without explanation. He is sedated, stuffed inside a trunk, and dumped in a park. When he awakes, he is free to reclaim what's left of his life...and what's left is revenge.Manga that inspired hit Korean movie Old Boy!

The assassin Yan Po wipes out all 18 members of the Huang family in one blood-drenched night, stealing the secrets to shape-shifting magic in the process, subsequently disappearing without a trace. One girl from the Huang family survived, vowing to take revenge. 70 years later, the most popular phrase in Chang’an is “As the mantis stalks the cicada, behind them will lurk the Golden Sparrow. I shall not rest until Yan Po appears.”

From Go!Comi:
Taki thought he knew exactly what he was getting into when he accepted a job at the church as an assistant -- but the job description never mentioned dealing with zombies! When night falls, the mysterious priest Shikimi and his new assistant venture into the graveyard to destroy the freshly risen dead. The enigmatic priest always seems to know when and where these creatures will appear, and as the days go by, Taki begins to suspect that the danger may also come from within...

The Antique Store Onohara Hall's owner is 16-year-old high-school girl, Yoshino Hara. One day, a guy who proclaimed himself as 'Conan', Ninomiya (age unknown) and two suspicious men dressed in black came to find a ring which had been stolen by previous workers!

The story is about a Detective named Akiba who crosses paths with a High School Idol named Mizuho. He was assigned to protect her. But he's also a young detective and a bit unorthodox. For the first two volumes Mizuho ends up getting involved in Akiba's other cases but eventually it progresses into a friendship (and eventually a relationship??).

Waking up in an enchanted castle with a beautiful maiden by his side, Daemon has no memories except for a sword in hand. Will he be able to break the curse that traps them both?

Unable to pay of their fathers debt a set of twins is auctioned off at a human market. They were bought by a mysterious blond man who took them to his mansion where they found the disturbing scene of. Original Webcomic http://www.lezhin.com/ko/comic/twinslaves

A story of a girl who doesn't know how use swords or magic but is the best at making potions.

A story about a boy who notices a falling object one night and comes across an alien.

From Forbidden Garden:
Chaos and mayhem is afflicting Yoshida Akari's school. There is a ruthless bloomer thief on the loose-and no one is safe!
But on a more serious note, Yoshida Akari's best friend, Hayakawa Maiko has been missing for 3 days now, and it seems as though no one is making any head in the investigation. So, Akari decides to take things in her own hands and questions the last person who was with her best friend, Student Council President Morishita Natsu. He quickly gives her the brush off stating that he is too busy with the bloomer incident.
Who is this mystery thief and just what exactly has happened to Maiko?

Aboard the luxury liner Phase 20, a girl named Ran finds herself and the rest of the crew taken hostage by the illusive and nefarious "20 Faces."

Based on the game of the same name, a variety of artists and authors collaborate together to make a series of 4-koma comics making jokes, poking fun at the flaws in the game, telling stories and other hijinks as they go all out in these gag filled volumes.

Yuri is just a normal girl in high school: she loves hanging out with her friends, she has dreams, and she has worries. But one day, she wakes up in a strange forest she's never seen before beside a man named Chihiro. As the two of them learn more about the place they suddenly find themselves in, and the oddly real dream they had of being abducted by aliens, the dark secret of where they are and what has happened to them will begin to unfold.

Based on the game of the same name, a variety of artists and authors collaborate together to make a series of 4-koma comics making jokes, poking fun at the flaws in the game, telling stories and other hijinks as they go all out in these gag filled volumes.

Tokiwa Kanenari likes to masquerade as a substitute science teacher, but he's actually in the business of dealing with the spirit world. And there are spirits in all sorts of things around him, from amber necklaces to unfinished paintings and even abandoned satellites.

The manga inspired TV drama series broadcasted in 1991.