Masaharu Tsuchiya has just become a freshman in high school and he’s looking to make a change in his life. He wants to be more active and more involved in school life, since the only club he was a part of in middle school he just coasted through. He’d also like to get over his lack of social skills when it comes to women. However, in his future, he’ll soon be tossed into a strange and magical world full of dancing after he witnesses his school’s competitive dance club in action…

From Essence of Purity:

Takuma Ban, only son of the Ban familly from Hokkaido, comes to Tokyo on a quest: to find a fitting wife... with the help of Meari his cow. Jumping over a school fence while carrying Meari on his back, he unexpectedly meets a girl, Yuki Samejima. After one minute, he decides that SHE'll be his bride. Unfortunately for Takuma, Yuki's older brother, Ranmaru Samejima, is completely opposed to this.

Of course, the fact that Meari seems to have developed an instant "animal" attraction to him only reinforces Ranmaru's dislike of Takuma. Takuma is determined to make Yuki his bride and that, despite Ranmaru's stern "objections". Nevertheless, when not only Kei Enjouji but also Takuma's own family start getting involved, things get a little … "chaotic".

(Note: was originally debuted as a shounen manga, but Kodaka switched publishers and began writing it as BL)

From AnimeWaves: A young boy gets saved from drowning by a mermaid but according to mermaid law, if a human sees a mermaid's true form, both are to be executed. The only solution to the problem is for him to marry her and become part of the mermaid family.

Collection of oneshots:

1) Kimi no Soba de Yamikumo na Yume wo Miru

2) 4/365 no Koibito

3) Ore no Koto Suki na Kuse ni

4) Seto no Omise no Okyakusama (Seto's Customers)
A bittersweet oneshot consisting of fairies and cakes.

5) Samishisa Spice

6) Boku to Neko to Akuma to Nichijou

7) Sora no Saudade

Sold by his parents to a brothel, Yuki is placed under the care of the mysterious Shirogane. Shirogane, who is known for his skill at training young boys to satisfy customers with their bodies, pleasures Yuki every night and introduces him to the debaucherous world of carnal pleasure. But on the night Shirogane declares Yuki ready to receive customers, Yuki cries "I only want Shirogane... please go all the way...!"

High school student Kou leaves his grandparents' house in Tokyo and returns to his home town, Yamami village. A childhood incident has left Kou with a crippling fear of fire, but in Yamami he meets a "Sorcerer’s Apprentice" who changes his attitude towards fire forever.

A coming-of-age story revolving around two boys who dream of becoming pyrotechnicians.

Yuzuki has always had an unrequited love towards her childhood friend Junya, but one day Junya starts dating his classmate Kaori.

Yuzuki was shouldering the pain that she would never be able to express her feelings to Junya. A while back, she had noticed that Toshiki was looking at Kaori with such a sorrowful expression. In order to obtain the paradise that she desired for, she decided to become accomplices with Toshiki but…!?

Contains a short story named Hatsutaiken:

Araki is dating Arashi but she has a secret from her past that she doesn't want Arashi to know. Will she be able to keep it a secret?

From Shinnen:

Ch. 1-3: Setsuna Yuki:
Nagisa is a normal high school student. For winter vacation, it's decided that they will go snowboarding. On the ski slopes, she watches a guy who is really good at the sport. She tries it out, but gets herself into a little accident, causing her to return to the lodge. There, she meets Soushi, the guy from before. It's her chance! Will she somehow be able to ask Soushi to teach her?

Ch. 4: Gokujou Ouji-sama

Ch. 5: Bitter Boy Café

When Leonie is invited to Rachel Richmond's English country mansion, she's immediately impressed by the famous actress's sophisticated style and impeccable manners. Her first impression of Rachel's handsome son Luke, however, is a different matter entirely! A proud, aloof man, Luke Richmond takes an instant dislike to Leonie, and, used to getting his own way, he repeatedly asks her to leave. But Leonie has been commissioned to write Luke's mother's biography; she's not going anywhere especially now she's realised that Luke's got something to hide!

From An Endless Story:
Popular stories from fashion magazine Zipper have made their way into a special book.

Letter by Hazuki Kanae
"Who are you?"
On a certain day, she discovered a letter left in her school desk...

My Best by Fujisue Sakura
"I can't touch him, because we are friends."
Where will these unsuppressable feelings lead us...

Miss You by Kumiko Saiki
And the day they part ways finally arrives...

Goodbye, I'll See You Tomorrow by Tomoko Noguchi
Yasaki, who finally gets a boyfriend, now has to enter into a long distance relationship! Even though she thought that the pain of not being able to see him was the same...

CHERRY by Matsumoto Nanako
The only person that would suit her is someone as extraordinarily popular as she is, right!? The person in question should definitely be...

To the You Who is Here by Haneda Ibuki
Does she still seem like a child to her older boyfriend?
All she wants is for him to glance her way...

Need Correction!!

Girl(?) has a disorder that causes her(?) to switch into one personality for every day of the week. Follow each personality as it tries to understand what's happening around them, and what happened since they last appeared. Throw in a mysterious costumed figure in the background, and you get this series.

From Vices and Devices: Bright and early one Monday morning, Shino Yuzuru asks Seryou Touji out on a lark when they run into each other at the school gate. Seryou, who's immensely popular, has the odd habit of going out with anyone who asks him out first at the beginning of the week, then promptly dumping them at the end of it. "Anyone" apparently includes male upperclassmen like Shino, and as a boyfriend, Seryou is perfect--unfailingly thoughtful and kind. Shino, obviously, has no intention of being in a serious relationship with Seryou. It's not like it's actually love or anything like that. ...Right?

Nanami Sekai gets scammed out of every penny he has, left only with a pair of boxers and a 3,000,000 yen debt. He then meets a girl, Ritori, who offers him a deal that seems too good to be true: she will take care of his debt if he will be her captain and help her with her job.

[Note]
It seems that this manga has been discontinued because the author became incapacitated during serialization and was not able to keep 2 series running.

From Village Idiot: To Minagawa Ichiri, both good things and bad things are bothersome. That's why his principle is to avoid doing anything that would cause such a thing. However, there is one thing that he can't avoid - because of his parents' jobs, he was constantly transferring from school to school. This time, he has transferred to Reimei Academy, one of the five famous private academies called the "Seven Sisters." On his tour of the school with vice president Kirishima Shitone, an attack occurs! The attacker seems to go after people with long black hair and a sword in an attempt to find and exact revenge on "Double Edge," who killed one of her best friends using a power called "Idea," where she brings her principles into reality using a wrist band called "Codec."

From MbE
The aftermath of confessing in impulse and love is…?!

A manga about an in many ways disappointing protagonist trying her best
- Description from NicoNico

Links:
Author's blog (JP): http://blog.livedoor.jp/torikai86/

The everyday life of Nakano, a salaryman working for an exploitative company, is suddenly intruded upon by the Kitsune, Senko-san (800 Years Old - Young Wife). Whether it be cooking, cleaning, or special Service(?)... she'll heal his exhaustion with her tender "care".

Despite the title this manga has nothing to do with sex, just young people rebelling against the world.
The manga is about the adventures of a girl, Kaho. In the first chapter she goes on holiday to Okinawa and starts following around Yuki, a car-stealing punk.

Souhei embarks on a trip in the gigantic labyrinth that suddenly appears in his basement. But it's an extremely special dungeon where the only way to become stronger is to do lewd things with girls and increase Lv (Love)! The story of a young boy who explores and does lewd things with women!