From JanimeS:
This series is not about romance, exactly, but does contain the element for it. This series mainly focuses on overcoming the main characters' hardships. Each character has a different hardship. There is really nothing more to mention about the plot.

It starts with a school girl who has trouble with her surroundings. It all started when her classmate was bullied and eventually commited suicide. Being a part of the group that bullied the girl, she feels extremely guilty. Her life becomes meaningless, and she wants to end it.

The term "femme fatale", or "deadly woman", is a stereotype of an alluring woman who charms her lover into an unsatiable desire for her, and draws them into dangerous situations. Its Japanese translation means "the fated woman". In this thrilling romance, Saito Hajime joins a club at his college and meets the "femme fatale": Yukari Ebisawa, a graduate student who loves donuts and has quite a quirky personality – and a boyfriend. However, their relationship soon becomes complicated, interfering with their friends, work, and club duties…

Fukami Rei is making the switch from modeling to acting, and getting a part in a drama with his idol Agawa Ryuuji is a dream come true. But admiration for Ryuuji's acting isn't the only reason Rei wants to get closer to the older man...

Rising actor and model Fukami Rei is extremely attached to veteran actor Agawa Ryuuji, causing Ryuuji no little consternation. One day, a fellow actress and Rei's aunt, Aki, tells Ryuuji to stay away from Rei and on top of that, the president of his agency tells Ryuuji Aki's really Rei's mother and asks Ryuuji if he is Rei's father. Amidst this confusion, Rei confesses his feelings for Ryuuji and steal a kiss!

The story takes place in an ordinary Japanese town, Fuyuki City. Hidden from society, there has been a deadly war going on in this town. Seven sorcerers known as "Masters" summon powerful familiars called "Servants," and they all fight each other till the last one. The last one is said to attain the Holy Grail, which will grant them a wish. Only a few know when this War started and what the Holy Grail is, but the war is about to begin again this year.

The main character is Emiya Shirou, who lost his parents in a fire and was adopted by a man who called himself a sorcerer. Admiring his stepfather, he has been training himself to be a sorcerer. However, he had no talent and he could barely use even one type of sorcery. His stepfather has already passed away, and today he's a sorcerer without any skills or knowledge. He is involved in the War of the Holy Grail when he accidentally summons Saber, who is said to be the strongest servant of all...

From [RC-SCANS]:

Shin-Young abruptly wakes up from a nightmare just to find a man, named Ji-Hoo, sleeping in the same bed. If that wasn't bizzare enough, the two of them find out that they were engaged ever since birth. Was it a mere coincidence or was it a work of fate that has not yet finished...?

Prequel of Freezing following Chiffon "The Monster of West Genetics" Fairchild

Vol. 1: Kooru Shakunetsu (Freezing Flame)
When Hirose Katsumi discovers that his father's company is in jeopardy as their largest customer, Mimuro, considers moving to other markets, he convinces his father to meet with the heads of Mimuro. Attending the meeting with his father, Katsumi has the unfortunate luck of catching the eye of the heir, Mimuro Yoshitaka. Yoshitaka calls on Katsumi with a deal that will allow the Mimuro Corporation to continue doing business with Katsumi's father. There is one condition, though…Katsumi must put Yoshitaka's needs above all else and do anything requested. With such a tough economy, and so many employees depending on his father's company, Katsumi has no choice but to obey, and begins a life of humiliation as the possession of a cold-hearted Yoshitaka. But, who is actually the one being possessed? And what will Yoshitaka do when his pet learns how to bite back, using manipulative tricks learned from the Mimuro heir to possibly turn the tables? (from Fushichou)

Vol. 2: Homura no Kusari (Chain of Flame)

Vol. 3: Mitsu no Rakuin (Honeyed Brand)

Vol. 4: Rekka no Shizuku (Melting Flame)
The story shifts to a new couple...

Vol. 5: Rekka no Shizuku (Melting Flame 2)

Vol. 6: Rouraku no Hana (Twined Dragon)

Vol. 7: Rouraku no Hana 2 (Twined Dragon 2)

Freesia is set in an alternative Japanese society that is at war, and has passed a law legalizing retaliatory killings. If somebody kills your loved one, you are legally sanctioned to kill, or hire someone to kill, the perpetrator. The manga is set around a character who works for a firm that specializes in these retaliatory killings.

After a heated argument with her mother, Keito runs away from home without knowing where to go. When she helps an old woman to carry her bags home, the woman offers to put her up in one of her rooms. Keito accepts and starts to pick up the pieces of her life. When she's not drawing her own comic, which features a black jazz singer named Angie, the young woman works at a record shop. That's where she meets and falls in love with Niki, an attractive trumpeter in a funk band. They sleep with each other. Unfortunately for Keito, Niki then explains that she's not interested in a serious relationship, but Keito is not willing to give up that easily...

An anthology of oneshots.

Story 1: Promise by NISHI Keiko

Story 2: They Were Eleven by HAGIO Moto

Story 3: The Changeling by SATO Shio

Story 4: Since You've Been Gone by NISHI Keiko

The two stories by NISHI Keiko were also published as a separate book in English called "Promise." Those stories were originally taken from "Mizu ga Kooru ni Naru Toki."

Read this to find out why the book was pulled off the shelves.

A lonely girl finds a devil doll on a rainy night. What will happen?

Aya and Hiromi are students at the same nursing school. Aya has known from a young age that she is a lesbian, and when she falls for Hiromi, the two of them end up becoming a couple. Thanks to Aya's influence, Hiromi begins to come out of her shell and stand up to her strict, controlling parents. However, her newfound rebellious streak could spell disaster for their relationship...

A collection of stories featuring young girls:

1. Ichigo Ichigo Ichigo (Strawberry Strawberry Strawberry)
This story is about a girl in love with the school nurse.

2. Kumo no Ito (Spiderweb)

3. Yuki no Ashiato (Footprints in the Snow)

4. Meishou Misettei (Untitled)

5. Mujintou e Motteiku Nara

6. Shikeidai no Elevator Girl

7. Hitotsubu no Umi (A Drop of Ocean)

8. Hoshi ya Sumire no Koto Bakari (Just Stars & Violets)

9. Mizufuusen, Kingyo, Ramune (A Water Balloon, a Goldfish, and Ramune)

10. Chanoma no Hana (Living Room Flower)

11. Yuki Bara Beni Bara

12. Suzuran Techou

From Bushido Angel Adventures:

Sou has a habit of taking in stray cats. Recently, however, a strange guy has been following him around. He's told the guy is a new transfer student to their school, Furuse, and he's really weird. But Sou has a strange feeling when he looks in Furuse's eyes, like he's trying to remember something important.

From Chinatown KM:
Chapter 01 - Aiqing Wasaibi (Side Story/Oneshot)

Chapter 02-04 Flying Free
A story about a girl who has always studied hard in school and has never broken rules. However, she has never tasted what true freedom is.

Chapter 05 - Another side story/oneshot.

A salaryman's life gets turned upside down due to a dramatic tragedy, and now he is going to have a summer adventure the entire city will never forget.

Se-Joon and Se-Wa are siblings with a dark, complex relationship. Se-Wa, a girl considered psychotic by others, is attached to her brother... a little too attached. In her eyes, there is only Se-Joon, and no one else. And what of Se-Joon's feelings?

This manhwa contains incest themes.

Title comes from French poet Beaudelaire's compilation of poems, Les Fleurs du mal.

When Ryou moves into a new apartment block, his neighbour Makoto makes no secret of the fact that he likes men, and Ryou is forced to confront the secret doubts he's always had about his own sexuality. Things get complicated when Makoto's history with the other resident of the building, Nanno, results in jealousy, tension, and love triangles all around.

1. Fumetsu no Hana
Moriki Naoya is a thoughtful, frail child who can't bring himself to leave his neglectful family behind. One summer during his last year of high school, he meets Takahashi, a boy whose injury has cost him the ability to pursue his dream of being a baseball player, and Noriko, a fiercely independent, perpetually upbeat tomboy with a devil-may-care attitude. As the season moves on, Naoya must either move with it or let the world pass him by...

2. For Those Nights You Can't Sleep
A young man who was brought up by his aunt due to his mother's poor health following her husband's abandonment, returns to his home town for the seventh anniversary of his mother's death.

3. I'm Not Fit to be a Detective II
A continuation of I'm Not Fit to be a Detective, chapter 2 of Tsuki no Sabaku.

4. Present
A man whose eyes are always cast towards the ground...

From Attractive Fascinante:

It's a sin for Father Chikayoshi to fall in love with his student, Motoyama Kiyoshi. He seeks forgiveness by giving full submission to Motoyama, letting Motoyama to taint and control him.