Rengo Orii loves superheroes. Other people say that his favorite, Megalith, is an old man who should just retire already, but as far as he's concerned, anything Megalith does has to be true justice. One day, a bizarre encounter leaves Rengo with the power to transform... not into an awe-inspiring superhero, but a horrifying insectoid monster! Rengo realizes that even though he might not look the part, he can still be the superhero he's always dreamed of being now, but it turns out copying Megalith's signature knee to the face isn't such a good idea when you're strong enough to kick someone's head off! Can a monster with a little kid's sense of justice really be a hero!? 

From Dazzling Scans:

In the late 19th century, the citizens of London began hearing news of a brutal street slasher and vampire. One day, Alan—a writer—meets a young woman named Marie who was attacked by this street slasher. He agrees to let this girl stay with him since she has lost her home, but ever since that day Alan begins suffering from strange dreams. In fact, Marie is a vampire! As they grow closer, Alan discovers a terrifying secret about his new friend. This is a story about love and the reincarnation of vampires.

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This series is a set of several extremely short pieces: usually between 2-4 pages in length. They vary wildly in mood, character and art style, and the detail is often stunning.

Note: The manga was serialized in Kodansha's novel and manga fiction magazine, which does not targeted a specific demographic rather the general reader.

Karam's new teacher, Mr. Lee, is also her mother's new boarder. Why does he seem so interested in Karam, and why does she feel some strange connection to him? This is a story of past and present lives, love, jealousy, sacrifice, and salvation.

From Storm in Heaven:

A collection of four short stories.
Story 3: Chihiro and Chiaki are twins with a special ability; Chihiro sees strange visions triggered by the things around him, but it's Chiaki who, without actually seeing them, knows what the visions mean. The trouble Chiaki has caused by blurting out the truth behind the visions has caused Chihiro to shut himself away to keep the visions from coming. But then, one day, his brother asks him to step outside...

THE BADGUYS is a superhero comedy heist comic with a cast of characters supremely out of their depth. Dealing with daddy issues, bad breakups, decades-old grudges and profound professional inadequacies, the whole endeavour is pretty much a foregone conclusion. Badguys never win: There are rules, after all.

Yoshika and Yukina are best friends at school. Yukina is both physically beautiful and possesses a kind and gentle personality that charms everyone who knows her, including her wonderful boyfriend. Yoshika is less traditionally beautiful and has a less alluringly feminine personality. In addition, she desperately likes Yukina's boyfriend. While Yoshika does care for her friend, she is also deeply envious of her. One day, a demon in the form of a house cat appears to Yoshika and offers her the supernatural power to take whatever she wants from her friend. How far will Yoshika let her jealousy of her best friend take her?

Four thousand years ago, the planet Roon was frozen by the ruling race, Kama, during a raging war. The Kama then emigrated to a neighbouring planet. But now the ice is beginning to thaw, and return to the home world is fast becoming a possibility for their descendants.

Dulk is a young man who wields exceptional power, in training to become a shaman of sorts. Since his early years, Dulk has experienced vivid dreams about Roon, though he has never been to - or even seen - the planet.

When he finally gets the chance to visit the once-frozen wasteland, he will discover the powerful destiny that lies in store for him, buried beneath the rubble of Roon's mysterious history.

From Storm in Heaven:

Supika studies at a school that teaches the magics of astrology and astronomy. Astrologers like Supika can use three magic items, a sun, moon, or star. Supika uses the star Spica (Virgo's brightest star), which is the most powerful item she can use at her level. In the school, however, women are stuck as third class students--they aren't allowed to reach the higher levels boys can. Of course, Supika doesn?t really agree with the obsolete rule and tries to get more powerful in order to become first class. Amano, the son of the principal, doesn?t agree with Supika?s free spirit and tries to stop her from becoming a first class astrologer...

Also inclued a story called Kaede.

Mio is an girl with above normal hearing, which has affected her all her life, she can hear all the war that's happening inside her country. But when Rico, a girl with a 3 minutes memory span, comes to save her and her country, Mio knows what she must do.

The evil Solomon's Child are turning people into Red Dust and it is up to our heroes Shik and Ryoji Kamishiro and the rest of the gang to stop them. Will our heroes stop the Solomon's Child? Or is there something bigger waiting for them on the other side? Read and find out.

Kishi works in the anime industry but doesn't really like his job. During one of his regular disappearances, he runs into a rather mischievous cat who follows him home and begins stalking him wherever he goes!

From Aerandria Scans:

A collection of six short stories, each with its own supernatural girl.

1) Shijima
A fortune-teller who exists by sealing other people's memories and living it as her own.

2) Dismounting Midway

3) The Passing...

4) Falling Sakura in Profusion

5) Beside the Water

6) Time's Aftertaste

Follows the game story.

From the back cover via Manga Abyss:

"My inheritance is a company that rents out magic users...what!?"

The extremely scared Iba Itsuki receives his inheritance left to him by his missing father: the Magic User Rental Company Astral. The magic users are rented out to customers to solve problems as requested.

How will Itsuki deal with the fate of being president when he's never studied mage-craft!?

Thirteen years ago a disaster occurred. Out of nowhere, a meteorite fell from the sky, and that's when everything started. First of all, there is said to be numerous people who vanished when the meteorite fell. Afterwards, according to certain reports, this was known as "spirited away".

At the same time, strange things happened. The sky filled with clouds, and a red mist shrouded the streets. And those terrible monsters had started to appear. A monster, in other words, a slave beast, one who has sold his soul to the evil king.

However, we must not despair, they have returned from the depths of the red hell, and in order to defeat the impending disaster they carry with them a gift in their hands.

"They have returned, the ones who posses the flash have returned to tear apart the fear."

In a town, there lives a legend of a phantasmic god of death. He protects the townspeople from all evil criminals but not a single soul knows what he looks like. His name is K. A boy searches for him and tries to discovers his identity.