In this story, we’re treated to a twisted, gothic-horror remix of the classic Cinderella story (as re-imagined by a shounen author for a shoujo audience), where we find, in the end, that nothing comes free, and if it sounds too good to be true, well, there’s usually a catch. You’ve never seen Cinderella like this!

It's a how-to-draw-manga thing KURUMATANI Haruko posts on Sho-Comi. There's about 2-3 pages of it each issue. It's not really a story or anything, it just talks about how to draw manga and techniques, etc.

From Midnight Scans:
Reika is a rich girl who wants to pursue her dream of being a mangaka; and so, she hired a butler, one whom specializes in teaching people how to draw manga. That is how Seba* came here.
However, since his knowledge about manga is vast, he turns into the ultimate Spartan whenever he teaches her! Even today, he whips her still.

The secret teaching debut, and the enthusiasm over cool butlers will start soon!

*Seba: Sebastian, but it is a common term to call a butler that, however, in this case, it might also be his name.

Hiroshi found a broken cellphone on the street and went to a shop to get it fixed. When it got delivered to his home, he got a life-sized girl instead but it is still a cellphone. Hiroshi only wants a normal cellphone that he can brag to his classmates but he can't return this one because of the expensive return fee written in the purchase contract. This is how Hiroshi discovers the advantages and disadvantages in life of owning a cellphone-girl, which he named Eko.

Sasshi's world is in disarray. His best gal pal, Arumi, is about to move away, and his Osaka neighborhood is being demolished in the name of urban renewal.
However, this little neighborhood has some surprises under its concrete -- it's actually a portal to parallel universes. And when this section of the city is leveled, the portal is cracked wide open. Sasshi and Arumi soon find themselves being hurtled from one strange world to the next! Making matters even more surreal, is the fact that these worlds seem to spoof and mock popular movies, video games, manga and anime.

Souta Inui is a manager at Megapro talent agency, an agency responsible for turning young, beautiful women into stars. Inui, however, spends his time at the office ogling posters of the idols his agency manages, and has yet to bring in any new talent or take on a single client himself.

When told to go to the streets and scout talent, Inui falls and unwittingly grabs ahold of a devil girl's tail, at the same time asking her to join his talent agency. Now bound by contract, the girl has no choice but to abide by his wish, making it her goal the become the number 1 idol in Japan.

But who is this girl? Why is Inui the only one that can see her tail? Is she really a demon aged many thousands of years? No matter the reason or history, it's now up to Inui to turn this aggressive devil with a (literally) killer voice into the number 1 idol in Japan.

Popular composer Shu Ooka has an older lover, a beautiful bully of a man, Shizuka, who is also his cousin. They enjoy a lovefilled life, together with his son Botan... Except, their neighbour, the popular stage actor Ryujin Takamura is actually on an amorous quest targeting Shizuka! Ryujin has real talent at playing the lead role of a lover. But he has also been Shu's rival since they were students! And now, Shizuka is helping Ryujin out with his housework making Shu's heart burn!

Botan also appears in Emono no Kimochi

From MangaArt:
A Gag manga that could be a bit strange... for sensitive readers.

Despite her family's protests, Aoi Sakuraba decides that she is going to marry Kaoru Hanabishi, her love of eighteen years. Once he realizes that her intentions are genuine - and that she's not just trying to get him to reconcile with his estranged (and domineering) family - he begins to definitely warm up to the idea, too. What obstacles must the two overcome in order to be together?

Akira Shiraishi, a young high-school boy with feminine features, joins Blaue Rosen, the all-girl band that Mizuki Sakurazaka, an androgynous girl of the same age, performs lead electric guitar in.

Their high-school life is anything but typical: Mizuki is the "prince" of her all-girl school while Akira is the "princess" of the neighboring all-boy school. A series of comical events brings them closer together, even as the prejudice of the people around them tries to hold them back.

Collection of oneshots. Very steamy!

1) When violated by the perverted school doctor, Mizuru calls out the name of his best friend Natsura. But it's his best friend, he can't possibly be in love with him...right?! With Natsura being mute and Mizuru not being true to his real feelings, will these best friends have a happy (and smex-filled) ending?

2) Ibuki has known that he is different from other boys since he was 12, but he has been able to keep it a secret. However, his dad's new Italian apprentice (who wants to bathe together!) is about to shatter Ibuki's resolve!

3) Hachiya always felt Hozumi's eyes on him in high school, but never talked to him. Now they meet 8 years later in a gay pub but is it just coincidence? Or destiny?

4) Takashina has an imaginary friend name Michael...an imaginary sex friend that is! But he wishes to fall in love with a real man. Maybe his friend Toriumi could be of assistance?

5) Okabe is an artist who doesn't go out much. The first man he fell in love with is getting married soon, what is this difficult feeling? In comes Akiyo, a gay janitor who touched one of Okabe's sculptures. Can this straightforward and simple man show Okabe the world outside of his easel that he's been longing to see?

6) Our Sin

7) Lovesick Baby

Takayama is gay. While at work he begins to take note of successful and peerless Ishikawa, whom he eyes hungrily. Ishikawa finds out that Takayama is gay when he sees him in a compromising position with a hook-up, but surprisingly he does not out him at work. When a deal of Ishikawa's goes bad, he is infuriated. In a fit of rage, Ishikawa forces himself on Takayama. Takayama decides that he can forgive him for this one-time incident, but can this sordid physical relationship continue?

1) Everything For the Sake of Love
Akira is a kind girl who loves to be with her friends. Because of her high success rate in matchmaking, her friends have given her the title of "Queen of Introductions" (Matchmaking Queen)! But for some reason, Aki-chan can't seem to get a boyfriend for herself...

2) If Someone Like Me Would Do

3) Chocolate Contest

From MangaONE:

This is a story about the Over-thinking pig with his frustrations with love, his suffering, and how he eventually tries to cheer up. Of course, while we watch and laugh at his bitter experience, we simultaneously recognize his circumstance in our own troubled relationships. Only when we can understand how feelings change when in love will we find true happiness.

Nikotama Souhei is transferring to a new school and vows to enjoy a new life, living a lifestyle true to herself. Adopting the name Sara, she, a transgender girl, heads to school in a girls' uniform, ready to grab life by the nads and twist. Sara's no pushover: bright, hyper and kind. She is like nothing anyone at the school has ever encountered, and faces hardships regarding her gender identity. But she also finds the sweet, upstanding classmate Naruse Kaito who finds himself knee-deep in Sara's "Brave New World".

1-3) What is Love?
Kojima, the Vice President of the Student Body, always strives to be on the #1 spot in school. He normally gets along with the carefree Kurata… until one day Kojima snaps and forces Kurata to have sex with him. So starts their S&M relationship or is it love…?

4-6) You are the Worst
Hiroto and Kota's parents suddenly got married and the pair are forced to play nice and be the perfect brothers to each other, but will it really work?

7) Give it All to Love
Kaji talks about his type.

8) X
Another omake.

9) Afterword

From Fantasyshrine:

1-2) Keigo and Gunji are both stubborn and prideful men who didn't realize their mutual love for each other until years later when both ended up in the same hot spring together... with their kids!? Will they come to terms with their feelings for each other?

3) Sweet Honey Drops
Gunkichi and Keita (the kids) are growing up and falling in love.

4) Act.
For Ryouchi it's love at first sight with actor Sou Seiji. Getting a job near his idol is the first step for Ryouchi, but of course, Seiji is not the person Ryouchi thinks he is.

5) Dandy at Dawn
Newspaper writer Tetsuya manages to implode his big city life and has to move back to the country. Waiting for him is neighborhood boy Kyosuke who's gotten much bigger in his absence.

Hitoshi Kobe is a terrible student and an even worse athlete ... though he does have an incredible talent for creating Artificial Intelligence programs. Thirty is his best artificial intelligence program yet -- and, more important, the only girl who will talk to him. Hitoshi's life is forever changed when a freak accident brings Thirty to life ...

1) Ai ga Aru kara
An insatiable lust for men has landed Matsuzoe with his fair share of them. However, after sleeping with a new and younger acquaintance, he’s gripped by an inexplicable sadness.

2) Re:Cycle
Tomo picked up a stray cat even though it was against his apartment's regulation and got kicked out. Luckily Yuusuke suggests that they live together instead.

3) Kemono Dou
Even though Kaji has no problems finding transient love, he is looking for more than just a one night stand.

4) Omoeba Tooku e Kita Mada
It is almost dawn and the taxi driver picks up a passenger that tells him "Let's go to the beach".

5) Dourakuteki Matomo na Nichijou
Kousaka is fretting about his workplace; his boss seems to be completely nonplussed whether the cafe will go under.

6) SWEETOGRAPHY
Yamanobe looks like he is leading the charmed life but Itou slowly learns that there are many things that he can't exactly talk about with others.

7) Hana Aogu
The heir to a flower arranging business is being pressured to marry soon. On the eve of the marriage interview he meets a man who makes him question his duty to his family.

8) Tooku de Mikaketa Ano Hito wa
Matsuzoe (from chapter1) sees Masaki by chance on his way to his latest conquest's place.

From Central Park Media:
In reality, an ugly duckling could never become a beautiful swan. However, when a short ugly boy makes a wish to be reborn beautiful, his wish is granted and he becomes a gorgeous young man that all the girls fall for. Will being beautiful be everything that he hoped it would be?

With the related titles there's a total of 7 volumes, separated into 3 parts:

I. Agreement of the Glass Shoes (this title),

II. Dolls Music Staff, and

III. White Night Fantasia.

The 3 parts are linked by a pair of marbles with glass shoes embedded in them.