From MangaHelpers & Kirei Cake:

Vampires now coexist with humans by forming contracts with human beings. Vampires who form these contracts become their pets, serving their every need. They are given pet collars, distinguishing them from wild vampires, which are still very dangerous.

Daichi really wants a pet vampire, but his older sister won't hear anything of it. One night, a wild vampire princess named Iko breaks into his house! Iko discovered that Daichi's older sister has the extremely rare blood of Chernobog, which she believes would make her powerful enough to destroy the anti-vampire organization called Abraham once and for all.

However, the blood doesn't work exactly as Iko expects, and this vampire soon finds herself forced to become the pet of Daichi and his older sister...

International idol, Haruka Heartline caused quite the commotion with her concert on a colony in space! What’s a girl to do when the whole world is literally willing to kill to get their hands on her? Technology, and magical powers and just the tip of the iceberg in this manga! What will happen to the poor idol who started this war, and who will end it?

Midnight is the story of a taxi driver named Shinya Mito (whose name is literally Japanese for "mid" and "night") and his various passengers, each of whom he helps in various ways. Shinya drives a taxi as a way to earn money for the treatment of a young woman named Mari, whose brain was injured sometime earlier as the result of an accident Shinya was responsible for causing. The taxi Shinya drives is equipped with a fifth wheel which makes the car more maneuverable under any kind of road conditions.

The beautiful student council president has a secret that she can't tell anyone.

Over 20 generations ago an army of soldiers, monks and alchemists gave their lives to seal away one of the world’s darkest secrets. In order to protect humanity, their souls were woven together to create a barrier, and their bodies turned to stone - preserved in time for their souls to return to should the barrier ever be broken. However the price was not paid by them alone- Now, centuries later, 4 youngsters variously affected by the curse, unwittingly stumble into this mystery...

Encroach on the forest and fight the invaders and the king of the tango bug boy.

After their death, people's memories fade. The wish to retrieve the fading memories of his deceased girlfriend leads Wu Nian to become the Magician of Memories.

Eccentric young man "Santarou" is constantly in search of love, most of the time, from the often calm and collected "Chiyoko". Hijinks ensue as in every chapter he devises a new scheme or gimmick to gain the affection of Chiyoko or other girls. However, with the help of his opportunistic little sister "Nanako", things often get out of hand. There is little continuity within each chapter, instead opting for interesting episodic stories.

From Tokyopop:

Some of our most cherished manga characters are blessed with magical powers...others have an extraordinary combination superhuman strength and cunning intellect. But Hibiki? Her only real skill seems to be making a pot of delicious tea... Or is it?!

Okamoto, a young middle schooler, wants to confess his love to a girl named Kamiyama through a love letter. However, things go out of his plan when Kamiyama shocks him with an unthinkable request.

One of Yamamoto Souichirou's earlier work. Featured on Shonen Sunday Comics Special, this oneshot takes place in the same universe as Karakai Jouzu no Takagi-san.

Here’s something cool. Suzuhito Yasuda, the wildly imaginative creator of fan-fave Yozakura Quartet, just launched a brand-new manga series in Japan called Bootsleg—today!

Originally published in issue 2 of Tokusatsu Ace, released in March 2004.
An official parody of Ultraman.
A week earlier, the self-proclaimed “Prince of Monsters” found a large egg in the mountains. From it hatches a Kaiju Girls. The “Prince”, wanting to be rich and famous, decides to tame the monster.

When the world is threatened by a parasitic alien invasion, our only hope lies with a group of super powered teenagers. But how can they save the world when they can hardly save themselves? Teamwork, optimism, and good intentions are seemingly no longer enough as each enemy is stronger than the last. They’re going to save the world, or simply die trying.

Junpei, a thick-headed martial artist. Ritsuko, tomboy and gun Otaku. Airi, award winning actress. These three are transported from their homes in Japan to a High Fantasy parallel world. Enlisting the aid of the most powerful elven sorceress in the land, they try— and fail —to cast a spell that will return them home. The result? The spell is made manifest as fragments on the bodies of five elven women throughout the land. To return home, they have to collect the fragments of the spell and join them into a working spell.

The catch? They don't know precisely which elves have fragments of the spell on them. The solution? Find every elf woman in the land and take off their clothes.

Fudatsuki Kenji is known in school for two things: for being a delinquent and for having a sister complex. He constantly follows his sister Kyoko around, fixing her giant ribbon and chasing off any boys who might be interested in her. However, the truth is much stranger than people believe. He actually doesn't have a crush on his sister-- in fact, he likes Hibino, the only girl in class who isn't afraid of him.
The problem is that his sister is literally a monster. She's a jiangshi (vampire), who is much stronger than an ordinary person and who needs a certain amount of blood from Kenji each day. Her ribbon keeps her in check, but if it comes off, she instinctively attacks the nearest person. Her ribbon also has a huge affect on her personality. With the ribbon, she's irritable and sharp-tempered, but without it, she's extremely sweet and apologetic (while she attacks). Will Kenji be able to keep his sister from hurting anyone, and maybe find some way to overcome his sister-complex reputation enough to have a chance with Hibino?

Hayate Ayasaki, 16, the world's unluckiest boy. Working hard as a child for food and school fees, his unemployed and indebted parents sold him to the yakuza for his internal organs. After temporarily escaping the criminals and contemplating the benefits of a life of crime, he was saved by a wealthy young girl; who now employs him as a live-in butler.

Close to our future, humans have made a new way to dream whatever they desire. Those who seeks to become gods in this dream world are called "Builders". Why does she want to become a Builder?

A red-hair witch impulse-purchases a boy and takes the boy home only to find out that she bought more than what she bargained for.Scanlation: http://www.surasplace.com/index.php/calling/67-webtoon/calling/1505-calling-11.html

Unity of Heaven and Earth is an action-packed manga set in a fictional modern society. It features the characters from Journey to the West, but all completely different. Introducing the master-turned-loli San Zang; the dragon-turned-horse-turned-beautiful woman White Dragon Horse; the pig-turned-Adonis Pigsy and Sun Wu Kong, who has been reincarnated as a human. All of your preconceptions from Journey to the West will be turned upside down!

Useless guy likes popular girl. Supernatural accident occurs. Popular girl saves useless guy. But it turns out the girl was actually the legendary mythical beast Fenrir and he's her little brother?