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?

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.

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.

Ageha Shiraishi has been sentenced to death, suspected of murdering her four roommates. In her prison cell as she awaits her execution, she tells her warden, Kyousuke, that she is innocent and that she did not commit murder. Kyousuke does some research, but finds that she is still guilty. Upon his return, he finds his superior tied up and stripped. After setting her free, he finds out that he has been tricked, and it was Ageha in disguise.
Ageha can impersonate anyone to the finest detail, whether it be hair color, habits, or even voice. She becomes the first fugitive of the Talsis Prison and she declares that she will find the real culprit. Kyousuke now only has one clue, which is "the Ageha" (swallowtail butterfly) tattoo on Ageha's back. The chase between the characters involved begins as they move to grasp the truth!

From JShoujo Scans:

Little Rin Fujiwara hated her own face a lot. It was not until her 6th birthday that a make up box she got as a present changes her perspective completely. In front of the mirror, Rin would play with the make up, which becomes like a magic that makes her stronger. Rin believes make up can change both appearance and heart, because it gives the confidence a girl needs.
Years later, Rin attends her first high school year. She decides to help other girls there to become pretty as well, using her make up box. Rin, hidden under the identity of Ageha, a legendary make up stylist, with a help from her classmate Kisaragi, who has to hide his real identity by crossdressing as a woman, is willing to do magic in front of the mirror and change girls “just like when a caterpillar transforms into a butterfly”. How to meet Ageha and have her make you more beautiful? Easy, just write your name and class on the butterfly card and put it on the bullentin board on the 3rd floor. Ageha will come for sure, so what are you waiting for?

Matsuno, a straight-laced lawyer, wakes up with a male prostitute, Rin, in his bed after a night of heavy drinking! Rin is like a stray cat with no place to go, working the city's night life to pick up clients and make a living. A few days later, Matsuno finds Rin looking for another client, and on the spur of the moment, goes up to him and tells him, ''I'm not gay so I won't have sex with you, but I can offer you a bed and food. ''A sweet and bitter love story filled with misunderstandings.

Includes a cute little oneshot called "The Ear's Feelings."

From Lovers Dream:

"If you become my wife, I'll grant any wish..." Maybe it wouldn't sound half as crazy if Saeju wasn't told this by a cat (who may or may not be some kind of prince.) But she's desperate for some payback, particularly when her longtime crush blows her off, ice-cold style. But what happens when you invite someone downright... unearthly... into your life? Saeju's about to find out- particularly when one strange cat becomes one strange "brother" she didn't ask for!

From Peccatore Sanctuary:

Because of a painful past memory, Kanan can't believe in love again. Yet after meeting with the priest, Jake, he begins to experience the joy he longs for. Even the strong posessiveness of Jake's, that is beyond normal, to Kanan is also a wonderful feeling...!?

Skyla is a young witch in a world where witches no longer exist. On her way to meet her husband she is picked up by an easily bored old woman and her servant, and a mysterious alchemist. What adventures will Skyla face on her way to Wells?

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.