Half a year ago, a giant spiderweb appeared across the sky. For a while, it got a lot of media attention. Eventually, when nothing seemed to be happening, people carried on with their normal lives, ignoring the spiderweb. Amedome Tsutsuji lives his daily life under the spiderweb. At school, people have nicknamed him "Ninja," since it's so easy not to notice he's there. Even automatic doors won't acknowledge his presence by opening for him. But he can see what others can't: aliens are coming down from the spiderweb, taking humans bodies as hosts, and eating people.

For that reason, he uses his ninja-like ability to carefully guard his crush, Mizuno, as she goes home from school. In other words, he stalks her, but with the best of intentions. He's determined to be there to protect her when the spider-aliens attack. To that end, he teams up with another, friendlier alien named Tsuda, who gives him a powerful weapon: a faucet. Will Tsutsuji be able to protect Mizuno from the parasitic spider-aliens with his trusty faucet?

From Liquid Passion:

Heartbroken and lonely, Takeshi turns to internet porn for comfort, where a new AV actor catches his eye. Desperate to meet him, he tries to find out more about the boy. But the road to love is never rockier than when the object of your affections is in the porno trade...

This is in a series of four, that are sequels or direct spin-offs. The list is as follows:
1. Te wo Tsunaide, Sora wo
2. Amayakana Toge
3. Aisanai Otoko
4. Vanilla Star

Noel, a member of a rock band, has hit writer's block and loses his position as lead vocalist. Around the time that his frustration with himself has hit a peak, he encounters a man wearing black clothes and sunglasses at night. While Noel confronts him hostilely, Revo remains calm. But what does he want from Noel?

Note: This is the manga adaptation of fantasy band Sound Horizon's Anniversary Maxi Vanishing Starlight.

Part 1 ends at v2 c13. As of 30.08.2017 there is no date set for a continuation.

From Lezhin: Yeon Jang Hwa is a more or less average college student: she attends a pretty good university, is not too ugly, and has a nice boyfriend. Her a twin sister, Hong Reon, on the other hand, is the opposite. Being the good sister she is, Jang Hwa sets out to help her twin sister... but at what price? The truth is in the details. Original Webcomic http://www.lezhin.com/ko/comic/twin 

Paris, late 19th century. Vanitas is a human who works as a doctor for vampires and wishes to save them. He uses a magical book called The Vanitas Grimoire to dispel an evil curse that corrupts vampires and turns them into blood-sucking monsters.

But...this very same book is rumoured to be the cursed tome that gives birth to vampires on nights when the blue moon is full. Noe is a vampire on the hunt for The Grimoire.

Who, really, is Dr Vanitas? What are the secrets that he holds, and what fate do those secrets spell for the vampire species?

Summary refers to the Ohzora Shuppan re-print, 2007:

1. Lovers and Souls
Shinomiya is a beautiful college art student who lacks the morals common to most people. After agreeing to be a nude model for Matsuoka, a photography student, he also agrees to sleep with him for money even though he is straight. However, what started as a small taste of the forbidden soon spirals out of control when Shinomiya begins selling his body to other guys as a prostitute in a male brothel. Can Matsuoka save Shinomiya from himself?

2. Vanity
After the events of Lovers and Souls, Tooru is still deeply heartbroken. Trying to find solace in Hikaru, Tooru challenges the terms of their friendship. But can he handle the consequences?

3. Sleeping Beauty
Matsuoka sees Tooru for the first time.

4. A Moon in Name Only
In their last year of high school, Akihiko Nozaki admits to his best friend Kai that he's gay. Kai is stunned but it doesn't change their friendship, but Kai's curiosity is aroused and he begins to see Nozaki differently.

5. The Name of that Sky
Sequel to "A Moon in Name Only", told more from Nozaki's point of view. Nozaki isn't sure whether to trust that his relationship with Kai will last, since he's even been dumped by gay men before. What's to keep a guy who wasn't even gay from breaking up with him?

Part of Rules / Hydra Series

Aiko should be dead, but when she awakes in a secret hospital, she has no recollection of what happened that night. Until a monster showed up and her memories flood back. Her arm changed into a powerful weapon similar to the monster, a chimera arm.

The secret organization Atheos asked her to help them fight off the chimeras. An accident happened that led Aiko to understand how much she wants to live, and decided to join Atheos, in order to find her place.

Our shop is located within a quiet neighbourhood, hidden within Genuine NEW'S full-body makeover salon. Because you can find relief from daily stress here, we always have a crowd of regular customers. If we are able to help you find the strength within health and beauty, it will be our pleasure. We have the newest equipment and a team of unique individuals, our whole team anxiously awaits your arrival.

The series contains 2 volumes;

1) Vartrag Tale
Ralph can see angels and demons. When he was five years old he came across the winged demon Valafar and was completely charmed by him. He made a pact with the demon in order to make his wish, to live with Valafar, come true. Seven years must pass, and there are two conditions that must be met for the pact to be fulfilled. Can the older Ralph discard his ties to humanity and fulfill the pact...?

2) Vartrag Tale - Korumajou no Shitsuji
The story of Valafar's ever-faithful butler, Belta.

Vampires Charles J. Chrishunds (Charley) and Johnny Rayflo have a strange relationship. Charley is a cyborg and a vampire hunter for the Vatican, while his master Rayflo enjoys a playboy lifestyle. While fighting crimes involving vampires, Charley struggles to control his lust for blood and for Rayflo, while Rayflo delights in seducing his servant and attempts to deal with issues from his own past. Rayflo cares about Charley (also known as Cherry and Chris), and these feelings don't seem to be one-sided.

*The second volume of Vassalord contains a bonus one-shot in the back, a fantasy story called "Zoul Half." This special one-shot was first published in the Comic Blade Masamune summer issue in 2003

After a series of bizarre incidents in his school, student Kometaki Okaka decided to investigate the cause of it. What he discovers will turn his world upside down.

Note: This series has been cancelled, on the mangaka's request, at 44 chapters. For more information, see here.

In the nooks and crannies of the city, in the forgotten corners of rooms, insects are posing a growing threat! Where there are bugs, there is one girl! Her name is Inaho, and when it comes to bugs, this high school girl can solve any problem.

"He", a police officer on his shift, happened to meet "her" on the streets, by chance.
Through its bold, yet delicate brushwork and elegant prose, this stylish, full-colour comic illustrates the subtle air of intimacy between these two individuals.

• Ame no Veil (Veil of Rain)
Taguchi fantasizes about the ever-cheerful Kanzaki. Does he have other expressions besides the happy face he shows the world? One day, they get caught at school because of a rain storm and Taguchi finally gets his chance to find out.

This is a strange love story about a genius who is unable to erase his memories and an average girl.

Mika, an average female high-school student, falls head over heels for her beautiful violin teacher, Akizuki, who has the uncanny ability of "never forgetting something he's remembered once."

--

Includes other works:

- Lion
- Room 1/4: Penniless Cinderella

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.

Nitta Shin finds himself saddled with a sudden, crushing debt. His loan agent tells him he can escape repayment if he keeps a particular woman company. He gradually learns that this arrangement might not be as easy as he once thought.

After witnessing her secret girlfriend's murder, normally calm and cool-headed police detective Seolah becomes obsessed with finding him and taking revenge.

Your father embezzled company money. Marry me if you don't want me to disclose it. Four years ago, Isobel married a man she didn't love without telling the truth to Lorenzo, who she truly loved. Soon after her husband dies in a traffic accident, Lorenzo appears! He went to the U.S. after they broke up and has achieved great success. He now offers to acquire Isobel's father's company, which is in financial difficulty! "I rejected him four years ago. Is this his revenge?"

In the rural and peaceful Belzenia-Asmodin Empire, women of all ranks, ages, and marital statuses have begun disappearing one after the other. All they have in common is that they are both beautiful and reputable. Where have the stolen women disappeared to - and who will be targeted next?