Masago is an average student. Everything about her is average except for her older brother, Shirou. He's the president of the student council and everyone admires him. One day, while walking home with her brother, they get into an accident and her brother dies saving her. After Shirou's funeral, Masago goes to the house of her brother's best friend, claiming to be her older brother.

From Infinity Studios:

When you're the most notorious delinquent at school you have one hell of an image to maintain. The last thing you need is to be seen taking orders from an innocent puppy-eyed girl. But unfortunately for Keiji Sendai, he finds himself in this exact predicament when, Setsuna Yatsusaki, the shyest girl in school (as well as being the biggest klutz) finds out about Keiji's deepest and darkest secret... that he's a hardcore otaku! With her new trump card, Setsuna blackmails Keiji into becoming her slave. But just how long can a weak naive young girl keep such a dangerous young man as her pet dog? Join in on Setsuna's secret as she sets out to "train" a notorious thug in this unorthodox love story.

Note: Was originally serialized in Dengeki Teioh magazine in 2005 as "Kyouhaku Dog’s". This run ended after the magazine became defunct in 2006.
Serialization restarted in 2010 issue of Dengeki G's Festival! Comic under the title "Kyouhaku Dog’s - Another Secret".

Nakahara Yukiko stumbles upon a class filled with supernatural students... Just what are these weird misfits doing in a human high school? NOTE: READ FROM RIGHT TO LEFT. ALSO MASSIVE ART-CHANGE AFTER THE FIFTH CHAPTER. 

From Chibi Manga:

After she took some medicines, Michiryuu became suddenly a little girl. People used to say that she was perfect. That's why she wants to go back to normal as quick as possible. But that will only happen if she can find a person she can fall in love with. That's completely impossible for her! So what can Michiryuu do?

In the Taro-kun wa Kou Miete Igai to xxx Desu. series:

V.1 - Taro-kun wa Kou Miete Igai to xxx Desu.
Living in the same apartment complex, Taro-kun who always looks so scary actually is…?

V.2 - Yappari Taro-kun wa Kou Miete Igai to xxx Desu.

Blood, war, and betrayal: this is the story of the Scarlet Macaw, leader of an organization devoted to crushing political threats on the Mervellian continent, a part of the Crimson World.However, the Crimson World is becoming darker than ever...http://tapastic.com/episode/81638

A collection of stories:

1-2) The Land of Dreams in My Darling
Shiro is lovingly taking care of his long-time crush Shohei, an aspiring ero-writer. Shohei has not changed at all since high school, when he was regarded as "The most disgusting man of the year", but for mysterious reasons his image in girl's eyes changed totally after he had entered university. Shiro's word crumbles when he catches Shohei using sex service.

3-5.5) Reaching the Deepest Place
A disillusioned P.E. Teacher, when patrolling streets, meets an intriguing younger guy. The problem is sensei gets easily drunk and ...

6) Hands in the dark held such warmth
A Yakuza and a Host.

The sky has constellations, and humans have teeth. The earth has hills, and humans have little things.

A fun guide that teaches the basics of the art of manga by one of the most well-known mangakas in the business! Follow Eri on her journey to "become a pro and inspire people with dreams!"

He seduces girls, gets them and then dumps them. He specializes in the one-night-stand. He has no interest in love or romance. Dating someone would be a pain. This terrible guy, Hanada Shintarou, is nevertheless, extremely popular. But then he meets a girl who might just be the one who can change him and his low opinion of women. The only problem is that she despises him!

The story of the daily life of an ojou-sama who is in love with her butler!

Katsuragi Anna is a former ballerina who tries to find herself when her dreams of ballet stardom fall flat. She is tricked into joining the archery club by her friend... only to find that the president is her childhood rival, Jinnai!?

First year high-school student, Toujo Basara, is now living with two beautiful step-sisters thanks to his eccentric dad. But Mio is actually the new Demon Lord and Maria's her succubus chaimberlain. Throw in a "reversed contract," rival demon tribes, and the ecchi situations mainly brought on by Maria for good measure, and you have a situation where Basara's life will never be the same. This seinen adaptation of the light novel mostly focuses on the said latter ecchi situations that occurs between the three main characters.

From Esthétique:

A girl visits a dog shop owner everyday, and suddenly is confessed to by the scariest guy in school! What is she supposed to do?

Collection of short stories:

1. Morotomo (With Thou)
Newly promoted managing director Masaru is besieged by the demands of work and married life. He has little patience for young half-brother, Yukio, a struggling writer. Yukio's carefree attitude to life leaves Masaru fuming, but it's his overfamiliar behaviour that leaves Masaru bothered in more ways than one.

2. Jingi Nashi! (Without Honor!)
Inept yakuza Sekiguchi loves getting arrested, for it's his best chance to get up close and personal with no-nonsense detective Murata. But when Murata warns him about the imminent closure of his gang, Sekiguchi faces an uncertain future. Can a guy who fantasizes about fondling the nipples of macho men in handcuffs ever go straight?

3. Seinaru Otoko (The Holy Man)
Pastor Andy, a missionary on a remote island, finds the brawny Taka washed up on the beach. Taka is the exact opposite of him in every way: a tough, brutish lout engaged in drug trafficking. Despite the danger, Andy offers Taka shelter and assistance - but his acts of Christian kindness conceal a dark obsession of his own.

Extra: Matta Nashi! (Without Delay!)
Detective Murata is determined to take charge in the bedroom. Sekiguchi wants to use handcuffs on him. Who will come out on top?

N/A

When Masami's father died, he was told by his grandfather that he had to move out. In order to find a new place that he could live in for 80,000 yen a month, he asked his unrequieted love "Kagome" to look for a new place for him. But unfortunately, because of that, he has had to join the "extremely normal phenomena observation society" that she founded. And on top if it, there are rumors that things seem to "appear" at the things that the she finds.

Siscon. Power-phobia. Son of the great General Luccafort. Son of a general. Wether-crown. Fourth-in-line for succession. The titles, accolades, expectations, respect, and envy for DX Luccafort keeps coming. But all he wanted to do was win Marion's hand.
Landreaall follows DX, his sister Ion, and his bodyguard/brother Rokkou as they leave their home in the countryside and brace themselves to take on whatever their famous last name brings them.

This is the tale of how Adachi Mitsuru went from being an assistant artist on a weekly manga to the superstar manga-ka we know him to be today. But it’s told (and written by) Mitsuru’s older brother Tsutomu, who was also an assistant artist early on in their careers…

From Attractive Fascinante: More of our lovely secretary and the president. Where is our knight in the black armor when his princess is in danger? And how deep is our gorgeous Mairo's love for Eiki?