From Shoujo Crusade:

It has been many years since the Taisho era. The daily private lesson life of a merchant's daughter, Aoi and a fallen noble, Reiichirou unfolds...!?

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Story from the cover of the manga:
Many years have already passed since the Taisho era began. Sonomiya Reiichirou who is a fallen noble turned tutor, and Maruya Aoi, the daughter of a newly rich dumpling seller, start this wonderful Taisho romantic love story. Reiichirou gives Aoi-sama strict and attentive lessons to help her become familiar with being amongst the rich and the powerful! However, when night falls, the lessons quickly change to private lessons!?

A special chapter was published in the 13th issue of Hana to Yume in 2011.

From Horobi no Michi:

Kirisaki Fumio's just a highschool girl in love...

...but then she finds out that the guy she's fallen for happens to love someone else.

...so she decides to go out and get a chainsaw.

And take it to school.

And then many things happen.

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One day Sa, a person who refuses to believe in fantasy, sees a pretty girl floating down from the sky. His peace is quickly shattered and he is brought into the world of "Christ" and "Apostles". However, the twist is these "Apostles" are fighting for their lives (and they're girls, not to mention). Who are these "Apostles" and what are they fighting for?

A parody of 19th-century romance, starring an eccentric Indian prince Rashanu (who also appears as a supporting character in Patalliro! by the same mangaka).

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!? 

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.

Ootsuka Renji is a high school student who has been looking for love for a long time. Unfortunately, none of the 100 girls he confessed to so far have returned his feelings. Each of them also unintentionally left him with tears. Meanwhile his schoolmates are more interested about a young star in the magazines, which Renji surprisingly didn't pay any intention whatsoever. Who will be the girl for him, if ever finds someone?

Yuka is a freshman in high school, living in the apartment next door to her mystery writer father and his new wife. The one thing she learned from her father was to "fall in love as many times as you can, and become an attractive woman." Now that she is in high school, Yuka is determined to meet her one true love. Will the day finally come when she will meet her destined one?

A Matsuzuki Kou anthology, containing four one-shots: 1) Omnipotent Medicine (Ramune Bannouyaku) 2) Ahiru Revolution (Ahiru Kakumei) 3) Under the Scarlet Sky (Ake no Sora no Shita de) 4) The Orange Angel (Orenji Tenshi)

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From Aerandria Scans:

One day, Riku finds a mysterious message on her table from a boy with the initials Y. N., stating that he likes her. Riku’s hoping Y. N. is the star of the school, Nakao Yoshiki-kun, but could he be interested in a girl like her? She wants to ask Nakao-kun if he was really the one who wrote the message, but there’s this guy who keeps trying to get in her way…

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.

A young boy, Gawain, lives in a mountainous, rural area with an increadible love for baseball and making the ball really fly. One day he runs into a visitor to the small area and she introduces him to a sport that can really make a ball take to flight, golf! It just takes one shot and Gawain is hooked. With his grandpa's approval he sets off to Tokyo with this mysterious woman to learn all he can about golf, encountering many colorful characters and obstacles along the way.

Rewrite is set in the fictional city Kazamatsuri where treeplanting and afforestation have caused the city to become overgrown with trees and flowers in much the same way that other cities are filled by buildings. However, while most of the city appears to be rural, there are many traditional city elements as well. While set in a modern setting, the city also gives off a strange sense of nostalgia. The basis of the story is set in a high school setting.

Follows the game story.

Fujidou Sayaka is the granddaughter of the famous detective Fujidou Souijirou. After her grandpa passed away, he stated that Sayaka can have his one million yen with the condition that she must work as a detective at her grandpa's agency. Or else, the money will go to the Tsurukamei organization.

Reiki, a 12-year-old boy who has been living with Sayaka's grandfather for 5 years, is now Sayaka's assistant. As pretty as Sayaka is, she's also very arrogant and doesn't like this job at all, and most importantly she often bickers over Reiki. One thing that they both didn't know at first place is that Reiki's innocent face is just grandpa's trick to seal Reiki's true personality - a cold and violent boy. And most importantly, the key to unlocking that secret turns out to be Sayaka's hot naked body!

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!?

Kanou is in love with one of his employees, the handsome Sawamura, who is really nice and popular. But Kanou is used to having bad luck in love, so he decides to hold back his feelings... But during a drunken night, events take a surprising turn... And Kanou realizes that the Sawamura he imagined, may be very different from reality...