Verde, a powerful and secret organization that controls the world, has a new leader. The only thing that stands in its way is an unlikely character, Kujou Shin, the king of pessimists. He has no attachments to anything or anyone and feels no hesitation to dying. He is unwillingly dragged into a fight for the most powerful position in the world, the leader of Verde. What will his fate be?

From Tokyopop:
Coud is a young sky pirate who discovered a girl with mysterious powers on what had seemed like a routine mission. Ren has the ability to lend Coud bizarre fighting capabilities (his arm turns into a giant blade of some sort), being part of a race of beings called Edel Reid, but being the possessor of a stone called the Elemental Gelade, she has powers even beyond the norm.

Melty Blood (????????, Meruti Buraddo?), is a visual novel and fighting game, co-developed by d?jin circles Type-Moon and French-Bread, originally released at Comiket on December 2002. It is shortened as simply Merubura (?????). Based on Type-Moon's visual novel game, Tsukihime, it later spawned an arcade version, titled Act Cadenza, that was developed by Ecole Software and has also been ported to the PlayStation 2. Act Cadenza is the first Type-Moon title to receive a PlayStation 2 port. A manga version by Takeru Kirishima has been serialized in Kadokawa Shoten's Comp Ace. [from wikipedia]

Kohei Hasekura is a sophomore who transfers into a prestigious public school--an English style six-year school, serving junior high and high school students. The school, named Shuchikan Academy, is on an island, Tamatsu Island, off-shore from mainland Japan, and the only way to get there is by boat. But under the peaceful surface, this prestigious academy holds a dark secret. Some of its students are vampires! And Kouhei will be dragged deeper and deeper into the mystery of the school and the girls that attend.

Teased unmercifully for his past as an orphan and a slave, Teito has only his best friend Mikage to ease his days at the elite Barsburg Academy - and his mastery of the magical art of Zaiphon! But even that will not be enough to save him when he discovers a horrifying secret behind the ruling Empire. Trapped in an ancient battle between a wicked Death God and the Seven Ghosts and guided by three mysterious priests, Teito discovers a power that could save the world... and shed light on his own mysterious past.

From Tokyopop:
Hideki's just like every other guy in the 22nd century. He just wants a good job, a good car, and a sexy robot girlfriend to call his own. Until he lands a job, he'll never be able to afford his own 'Persocom' companion. Hideki's luck changes when he discovers Chi--an adorable but seemingly stupid Persocom--tied up in a pile of trash. His first robot companion turns out to be a lot more responsibility than he expected, and she gets him into quite a few embarrassing situations. It's 'boy-meets-girl' for the cyber age.

Abe Maria, an ordinary high-school boy and Nanami Tokuko's childhood friend, is the world's last pureblood vampire!! For 10 years, Tokuko has been encouraging him to become a part of human society, and since then, Maria has come to love humans. As such, Tokuko happily watches over Maria. This couple's story is the world's most gentle vampire comedy.

*Includes an extra story called Manshinsoui no Futari (The Wounds that Cover Us) in vol. 1 detailing a high-school romance between a boy who is suffering mentally and an extremely clumsy girl.

From Village Idiot:
What will happen to an ordinary human teacher who falls into a youkai school, with his only ally(?) a sexy but air-headed nekomata? A slight ecchi and heartwarming read brought to you by the author of “Sore wa Totsuzen, Unmei no Aite ga”

A short story about a cat demon and a teacher.

From Pink Rose Scans

• Ketchup Mayonnaise
Atsushi's bar-tending mom remarries to a rich, strait-laced (if not slightly old) salaryman. They move into their new house, and he can now sleep in a bed fit for a Prince! With the union, they've become one big happy family with him, his mom, his new step-dad, his step-dad's kids Peter and Kurara, and the ghost of his ex-wife....wait, what?!

• The Spring of Water
Maki should be on cloud nine---she's snagged the boyfriend of her dreams after finally confessing her love for him on the train platform, with a little help from her friend Fumika. They've even passed the half year mark in dating when everyone around them predicted they wouldn't last a month. Why is it then that she's starting to get the feeling that this was all a mistake?

• Chocolate Ice Cream
Sakura's been in love with Niiya ever since she wound up in the same class as him back in elementary school. Niiya, however, doesn't seem to be as enthusiastic about her. So of course, when God gives her the chance to change her face to one he'd madly fall for, she readily agrees! Who does she become? And does she finally get her man after 14 years of unrequited love?

Ishiyama High is a school populated entirely by delinquents, where nonstop violence and lawlessness are the norm. However, there is one universally acknowledged rule—don't cross first year student Tatsumi Oga, Ishiyama's most vicious fighter.

One day, Oga is by a riverbed when he encounters a man floating down the river. After being retrieved by Oga, the man splits down the middle to reveal a baby, which crawls onto Oga's back and immediately forms an attachment to him. Though he doesn't know it yet, this baby is named Kaiser de Emperana Beelzebub IV, or "Baby Beel" for short—the son of the Demon Lord!

As if finding the future Lord of the Underworld isn't enough, Oga is also confronted by Hildegard, Beel's demon maid who insists he take responsibility as Beel's guardian. Together they attempt to raise Baby Beel—although surrounded by juvenile delinquents and demonic powers, the two of them may be in for more of a challenge than they can imagine.

Atori has an unusual part-time job... she’s a demon hunter! After school, she hunts demons for a mysterious organization named N.U.E. To kill her enemies, she unsheathes the saber hidden within her hair. However, Atori is actually half-demon, but she has forgotten her past. Despite this, she's been able to overcome many difficulties as well as befriend those from both species. Unfortunately, her once calm life is beginning to quake as a terrible shadow now looms over her...

From Shoujo Manga Maniac:

1) Love Lab
The chemistry club invented a special hormone potion. Each bottle cost 500 yen. Riko-chan's boyfriend, Yuuki-kun himself is extremely cold towards love. Riko-chan hopes to move their relationship one step ahead, but in the end...?

2) Merry Kiss

3) Perfect Doll

4) Twinkle Twinkle

5) Cupid's Arrow

From Yen Press:
The air of celebration surrounding fifteen-year-old Oz Vessalius’s coming-of-age ceremony quickly turns to horror when he is condemned for a sin about which he knows nothing. He is thrown into an eternal prison known as the Abyss, from which there is no escape. There, he meets a young girl named Alice, who is not what she seems. Now that the relentless cogs of fate have begun to turn, will they lead only to crushing despair for Oz, or is there some shred of hope for him to grasp on to?

From tethysdust at MangaHelpers:

Minaguchi Kaoru is nothing special. He's no good at sports or school, isn't in any clubs, and he's not popular. He has no friends and isn't even interested in any of the girls he knows. He's also teased due to the fact that he loves shoujo manga. Unlike the harem daydreams of his peers, he dreams of finding his true love. Unfortunately, a shinigami comes to kill him, simply because he's a "forever alone" sort of guy. When he gasps out his intention of embracing life with his final breaths, though, she takes it back! As long as he follows through on his intentions, he won't be killed.

To convince the shinigami that his plans are genuine, he declares that he will confess to the girl he likes, the very next day. Expecting failure with confessing to random girls in his school, he sends out love letters to four different girls. To his surprise, they all agree to be his girlfriend. Now, this shoujo-manga-loving guy has ended up in a kind of harem story, quadruple-timing four girls! Will he be able to stay involved enough with society to avoid an early death?

There is a Gothic-style mansion in a distant, rarely-visited part of Japan. There, the world's greatest surgeon, Naomitsu Madaraki, once lived but he hasn't come home in ages.
Instead, the professor's "daughter", Fran Madaraki, lives there with a large amount of her own ghoulish creations and her "younger sister" Veronica. She's a very unusual girl, what with the stitch patterns on her face and the giant bolts on either side of her head. Just as skilled at surgery as her father, and if you're willing to pay her price, she can do everything up to and including raising the dead. Fran believes that a life should be saved no matter the cost, and keep that in mind, since the results of her surgeries are rarely (if ever) pretty.

From Wingtip Cafe:
Suzu, an ordinary girl who possess extra-ordinary power to summon demons, was left with a flute, the only keepsake of her disappearing 'Father'. In the flute, dwelt the guardian spirit who responds to her plea in danger.

From Yen Press:
At the invitation of an old school friend, introverted high-school student Mikado Ryuugamine, yearning for a life less ordinary, makes his way to Tokyo. His destination: Ikebukuro, a hotbed of madmen living most unusual lives. On his first day there, Mikado encounters a cast of characters so colorful, the rich hues of his rural hometown pale in comparison! And as if the naive stalker chick, the high school senior obsessed with the rather creepy object of his affections, the hikikomori genius doctor, the hedonistic information dealer, the strongest man in all of Ikebukuro weren’t enough…Mikado also chances upon a sight that leaves him rubbing his eyes and scratching his head — the Black Biker, who is black as night from bodysuit to license plate, soundlessly weaving through the streets like a figure out of an urban legend. Who is this “Headless Rider” on the jet-black metal steed!? And why does it seem like Mikado’s already gotten himself neck-deep in the insanity that is the norm in his new home!?

1st Arc: Durarara!! (4 Volumes)
2nd Arc: Saika Arc (3 Volumes)
3rd Arc: Yellow Flag Orchestra (3 Volumes)
4th Arc: Akane Arc (still ongoing)

In the 30th century A.D., in a world in which magic exists, 100 years have passed since the human race won a war against the Devil King. Even though the war caused many sacrifices, slowly but surely civilizations began to rise again.
One day, a virtuous child named Sai Akuto ("Worst Evil") is adopted from the orphanage he's lived in ever since a witch quietly left him at the church as a baby.
Five years later, Akuto passes the test to enter Constantin Magic High School. But after arriving and taking the vocational aptitude test, Akuto receives surprising results:
Examination Numbers: Number 021
Name: Sai Akuto
Future Occupation: The Devil King

Loser Yarahata Kanji can't even have a normal conversation with a girl let alone have any kind of relationship with one. But one day a ghost named Aiya appears and declares that he has been tasked with the mission to change Kanji's life. At this rate, the Yarahata name will not live on so Aiya will become a love doctor and coach him on how to develop relationships with girls.

The first hurdle comes when he starts a part time job at a convenience store and sees that his co-worker is a hot girl named Yoshizato Saki who also happens to be the store owner's daughter. With the help of Aiya, Kanji, although stumbling along the way, has a conversation with her and builds a relationship. But he has miles to go if he wants to be the kind of person that can date beautiful women.

School girl is trained by a secret branch of the police to detect and to kill demons disguising themselves as humans.