From Viz:
Nana "Hachi" Komatsu hopes that moving to Tokyo will help her make a clean start and leave her capricious love life behind her. Nana Osaki, who arrives in the city at the same time, has plans to score big in the world of rock 'n' roll. Although these two young women come from different backgrounds, they quickly become best friends in a whirlwind world of sex, music, fashion, gossip, and all-night parties!

Note: Won the Shogakukan Manga Award for shōjo in 2002.

Strange things are appearing from the sky, and the world is slowly dying. In Korea, there aren't enough military men to fight these enemies off, and high-school and college students have no choice but to join the military and help the others survive - at the risk of their own lives.

Thousands of years ago, Vampire King Akabara "Red Rose" Strauss lost both his kingdom and his queen. Since humans were unable to kill the queen, they sealed her away, erecting thousands of fake seals so that the king would never find her true location. Despite being pursued by relentless dhampires, Akabara continues to search for his queen to this day... Akabara's quest takes a sinister turn when an entity called the Black Swan appears. The Black Swan inhabits the body of a young human girl every 50 years, giving her the power to destroy the Vampire King and his queen. With each incarnation the Black Swan grows stronger--will the 49th Black Swan mean the end of Akabara?

Ryo and Akira travel through time in order to eradicate demons that could have changed history. Various periods are visited: from pre-WWII to ancient Greece, middle ages in France meeting Joan of Arc, far-west America, renaissance.

"I killed my sister. Now I will live as her."
Mischevious Nobara and good-girl Kotori are identical twin sisters. After their father's death, they lived with their grandmother and mother, respectively, but one day, while they had switched places, Kotori was murdered!

A bullied boy struggling with his depression possesses an unusual power to draw phantoms of evil spirit around him. Narrow-minded and timid, he has no hope for himself. Can he overcome the darkness that threatens to engulf him? Author/Artist: http://tapastic.com/ruki

Heureka is a manga set in antiquity, during the Second Punic War between the small city state of Syracuse and the Roman Empire. The comic is based around the life and times of the famous mathematician Archimedes.

Archimedes was not only a gifted mathematician but also an engineer of repute. During the conflict with the Romans, Archimedes was supposedly responsible for creating a number of war machines that devastated the Roman legions before they eventually got the upper hand. The exact nature and use of these devices is controversial, and exists more in the realm of legend than actual historical fact.

From ShoujoMagic:

A story of love and loss. Nae and Ryou have been going out for almost three years, but then something changes...

In the Abe Seimei Koikatari series

V.1 - Hana no Utage

1. Feast of the Flowers
Ming became blind after an unknown illness two years ago. One night, she meets a man in her dreams who restores her sight. She falls in love with him, but how will she find him again?

2. The Girl Among the Moonlilies
A princess chases a firefly which leads her to a man. She is so surprised by him that she steps backward and accidentally falls over a cliff, losing her memory. What will happen to her?

3. Moon's Dew; Star's Tears

4. Winter's Bloom

V.2 - Hanakanmuri no Hime (The Flower Crown Princess)

1. The Golden Phoenix, the Silver Phoenix
A princess longs for a lost love and almost loses her life until a mysterious exorcist opens her heart and mind to the truth and to what has been right in front of her all along.

2. The Hime with the Flower Crown
A young princess learns with the help of a mysterious young boy that putting away childish things may ultimately lead to a fulfilling new world and to the fulfilment of her beloved father's wish.

3. Memories of a Flower
While trying to solve the mystery behind the ghostly apparition of his beloved princess, a young man learns to ease his own sadness.

V.3 - Hanaemi no Otome

1. Hanaemi no Otome
A daughter of a high status man is being cursed by Douman, a man with strong spiritual power. Abe Seimei is set to save her.

2. Kaze no Hatsune
Story of young Douman's love, and also of how he met Seimei for the first time.

3. Tsukimiya no Maihime

V.4 - Hana Akari no Yakusoku

Several oneshots : 1) Overhearing a Flower Song 2) Into the Forest of Fireflies' Light (Hotaru no Mori E) 3) The Fallling of Autumn Leaves 4) Deepening the Scar - deals with incest, and it displays the feelings of a sister towards her brother

From Psycho Pandas:

"I have something I don't want to lose—
So much so that these terrible feelings have grown."

A pianist who attempted suicide 3 times, Juri, is taken to help her aunt at a prison where murderers who killed indiscriminately are sentenced to death. There, she meets a man named Yuu who took the lives of 3 people. A mother's antagonism--a brother's death... Together they embrace the violent rebellion in their hearts caused by the large, deep scars they carry. However, before long, they both embrace an earnest hope in their hearts. "I want to live..."

An adaptation of a novel by South Korea's most popular female novelist, Gong Ji-Young.

From Fallen Syndicate: "My father's last words were a curse, binding me even after his death." Genkyou is a city-state ruled by status and comprised entirely of nobles. Crime and underhanded deals seem to be an everyday occurrence and one in which many turn a blind eye. To fulfill his father's dying words, Iori travels to Genkyou determined to do whatever it takes to extract his father's revenge. However, their may be more to Iori than meets the eye.

From Nagareboshi Manga:
Harumi has been in the hospital practically her whole life. She has a life-threatening disease, and is kept inside at all times. Her life is incredibly mundane until she meets Masato, a new patient. He isn’t the best influence, being a heavy smoker and drinker, but since they’ve both got nothing better to do, they become friends. This humorous story follows their meeting and the night they spend together, talking about what it means to die early.

Born of an Incubus clan, Tsukiya has had enough of the pain that comes from only bringing death to the human men he comes to love and so closes his heart, and denies himself from ever again feasting on human souls. Gento, the ever persistent demon that he is, has never been far from Tsukiya's side and has seen him mourn the death of many lovers, never understanding why Tsukiya continued to seek a love with these mortals that would forever bring him nothing but pain. Now years later can Gento, still ever pursuing Tsukiya, finally win over Tsukiya's heart for himself, and can Tsukiya help a young Incubus through the pain that comes from falling in love?

From Dragon Voice Project:

Ayumi is a 16-year-old who has a crush on her classmate, Musashi. One day, the God of Death appears before her, and announces that she has only one month left to live. There's no stopping the hourglass of fate! Life is short, girl, so love with all your might!

Volume 1
1-2) Welcome to the Chemistry Lab
Shibaura, the Chemistry teacher, usually seems gentle and kind but what is he really like in reality? Will Kousuke be safe in the Chemistry Club?

3) Only You Would Steal me Away
Kobayashi is always appearing out of nowhere and clinging onto Kousuke's brother. What is his purpose? Is it just to help Kousuke and Shibaura, or is there more to it?

4) The King's Lens
Takeru has fallen in love with the photograph that Sumito has taken, but is strangely avoiding the photographer like the plague.

5) A Grave Sin
Ryuuya's father has just passed away, and now he is forced to live with his uncle, who also happened to be his father's lover.

6) I'm in Love With a Demon
Everyone has always avoided Zenta because they thought he was creepy and geeky, except the cutesy Hibino Rei.

6.1) Omake
Some short stories on the main story.

Volume 2
1) The Illegitimate Couple
It's been 6 months, and Shuri is wondering if Kobayashi is really his lover. Kobayashi's memory is continuing to improve, and he remembers something about Shibaura Sensei and the pharmaceutical company he worked at, but he can't remember what. Is it good? Is it bad? Will it affect the relationship between Shibaura Sensei and Kousuke? Will Shuri and Kobayashi move their relationship past kissing?

2-3) Welcome to the Chemistry Lab
Shibaura promised to call Kousuke during the holidays so they can meet up but he never did... The new school term started and Kousuke found out that he not only failed in his promise, Shibaura has completely disappeared without leaving any signs.

4) No Place to Return
Sakuchi's father works in a large company that requires him to constantly be on the move. Sakuchi struggles with the anticipation and goodbyes of fleeting friendships that he is always faced with. He has finally become close with Kobayashi and Kousuke, but it is time to say their farewells.

5) Last Letter
Ryoya has finally returned to the house he has spent the last 20 years avoiding.

6) Rigorism
Shuri is finally in university and now lives in the dorms. Kobayashi is unsure how he should proceed with their relationship without giving Shuri any trouble.

7) Omake

Volume 3
1) Road of Love
Shuri is finally starting to see that Kobayashi isn't really a cold person but rather, an awkward person. Kobayashi keeps things from Shuri simply just because he doesn't want him to worry too much.

2) Knockout
Dr. Kajiwara has been proposed to by his patient Mutsuhi but he is hesitating because he can't quite put Dr. Shibaura his high school crush completely out of his mind yet.

3) The Night Will Finally End
Kousuke has finally gotten into his dream company, Yuazu Pharmaceuticals. Willl he finally be able to find Shibaura?

4) Road of Fate
Miki is in love with Kousuke but she can't confess her love for him because she can feel that he already has someone else that he loves.

5-6) I Love You Too Much
Story that was also published in chapter 1 and 2 of Ikura Nandemo Suki Sugiru .

7) Character Profile

8) Omake

After his mother deserted them, senior high school student, Reo was living together with his mother's stern ex-lover, the very imposing uncle Shuuji. But 2 months ago, as he dropped by his home on his way with a friend one evening, an event occurred that changed their relationship forever.
Since the day his uncle forcibly embraced him, the man demands his body time and again and Reo who has been suffering ever since seeks his close friend Kenta's advice but...

Contains another short story: Pretty After ~ After

From Fantasyshrine:

1-3) Black Cat of the Matter
After rescuing Maya, the descendant of the Cat God who was injured from his unsuccessful first mission, Yujiro begins to feel a strong desire for the beautiful feline. Does Yujiro know that Maya is on a recovery mission for the calamity bells? This is a love that crosses the boundary of race.

4) Fox of the Matter
Can love between a deity and his priest be strong enough to defy everything?

5) Crystal of Love
What happens when a deity and a human find true love together?

1) Atelier
Art student Ritsu takes on Tagami, a teacher with a bad attitude.

2) Mad Dog Breeder
Kusugawa wants to discover what his coworker Oka means when he says he get "desperate" when he drinks.

3) Longing for the House Guest
Haruka and Jun are roommates and novelists. After Jun's sloppy housekeeping causes Haruka to injure his hands, guilty Jun needs to help Haruka any way he can.

4) White Snow, Black Wings
Ex-prostitute Mizuki and mafia assassin Katsuhiko are on the run from their former bosses, but Katsuhiko is sick.

5) Milk
A young man has a guy who wanders in and out of his life like a cat.

6) Twilight Amusement Park
Teacher is dating his student, Yoshii, who wants to quit school and work in an amusement park, but Yoshii's family wants him to study abroad.

7) Haruhi
His young patient dying of a mysterious illness, a doctor takes him on a trip to the sea.