The Arume, a dominating alien race of female humanoids (alien lesbians) has conquered Earth. With total control over the world they have begun live experiments on humans.
One day, out of the blue, a girl that Shouta Yanami has never seen before in his life arrived at his house asking to have sex with him. How will this end for Shouta Yanami?

From Kodanclub:
An ordinary, quiet town is shaken by a series of bizarre happenings brought about by the darkness in human hearts. There are no solutions in the real world: Only "Dream Messengers" can find the answers. Dream messengers connect the fabulous with the real and control the power of dreams. Their leader, Toko Mishima, works with 8 other messengers using the powers given by an old spell and a toy made by Toko's father. Toko, her younger sister Rinko, Hajime Tachibana, who loves young girls, and the six other Dream Messengers are given the names of days or stars - Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Raff, and Keito.

1) Fudanshi-kun Naughty BL-Like Experience!
Kouhei Arima is a bit of an otaku, in fact he's the fudanshi type! After meeting Kazuomi Shiiba, a closet bisexual hair stylist, Arima finds he starts experiencing the BL scenes he's used to reading about!

2) Obligatory Cross-Dressing for Gakuran Boy
Arima Kanata is male. Cross-dressing is absolutely not his hobby. However because of his feminine face he often gets mistaken for a girl. What to do when Mimasaka Kyougo, home room and PE teacher, suddenly finds something weird in his bag during a surprise inspection while he is dressing up as his twin sister?!

Fifth grade. The threshold of puberty, and the beginning of the end of childhood innocence. Nitori Shuichi and his new friend Takatsuki Yoshino enjoy happy homes and loving families, and are well-liked by their classmates. But they share a secret that further complicates a time of life that is awkward for anyone: Shuichi is a boy who wants to be a girl, and Yoshino is a girl who wants to be a boy...

From Shoujo Crusade:

[It's okay to be a servant, I want to be by your side...!]
[You'll treat me really really well?]

Mayuri, a girl who wanted to be acknowledged as herself shares the same room with her senpai, Akira who is the student council president and a beautiful person envied by others. But, Akira has a big secret...?
Somehow, her real self is a "boy"!?
Moreover, he makes a petition of wanting to be Mayuri's servant...?

Thus, the wonderful room sharing life of the domineering (!) beautiful girl, Mayuri and a boy wearing girl's clothes who's also a bit of a trickster (?) Akira starts.

Takamiya Satoru's lyrical love comedy.

Summary: "If i were to become a guy, then i would never make a girl cry!" Said Jun, who just had a break up with her boyfriend. "Then why not become one?" An old woman told Jun... which startled her. Note: As of December 2011, the series is now being officially published by Oh-no!Manga (in the Philippines) and is not an OEL anymore.

In the year 1863, a time fraught with violent social upheaval, samurai of all walks of life flock to Kyoto in the hope of joining the Mibu-Roshi--a band of warriors united around their undying loyalty to the Shogunate system. In time, this group would become one of the greatest (and most famous) movements in Japanese history... the Shinsengumi!

In 2003 Kaze Hikaru won the Shogakukan Manga Award for shoujo.

Firiel Dee is a 15-year-old girl who lives with her poor foster parents in the remote mountain highlands of Sera Field. One day, she is invited to go to a ball, only to discover that she might be the heir to the throne. Soon, Firiel and her friends decide to partake in a quest for the truth, unaware of the dangers that await them.

From BangAQUA:

A marvelous actor who has stage fright plays various roles in real life!
The agency Catherine is the company which sends so-called extras in real life.
Yaegashi Taiga, a marvelous actor that has stage fright, tries his best to fulfill the requests he is given by this company. One day, he is told to work on a request with the newbie Amae Shizuku...
But Shizuku has a secret and...?! Please come to our office if anything troubles you!
The excellent extras will support you throughout your daily life.

N/A

A gender bender about a boy reaching for the top of I.D. Entertainment as an idol, when he is unexpectedly put together with a newly debuting trainee.

Sakura Manabe is a 16-year-old high school student and is living with her 12-year-old sister Momiji and 27-year-old sister Botan, who works to support the three of them. Their 19-year-old brother Kashiwa has been away at college for two years and has suddenly decided to come back to live with them. However, when Kashiwa arrives, Sakura and the others discover that Kashiwa has now decided to live as a woman. Sakura and her two sisters now have to cope with the new reality of having another sister.

Haotian and the Emperor's third son, Liu Xi, were rivals. One day, they quarrelled with each other and unfortunately both of them fell into the Otome Reincarnation Road and being reincarnated into pretty girls.

N/A

Even though J no Subete is three volumes long, each volume is a dynamic story in itself covering a particular stage of J's life. Her life is a dark story and it's a very psychological manga.

Book one is about all of J's trials and tribulations throughout childhood, during high school as she tries to find her place in the world and when she meets the somber honor student Paul...

Timeline (from Oriolidae & Sparviero):

01 Barairo no Hoo no Koro v01 ch01-05
02 J no Subete v01 ch01-05
03 2 Shuukan no Adventure v01 ch05-06
04 J no Subete v02-03
05 Barairo no Hoo no Koro v01 Extra

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Lezhin publication

From Omari's Sister:
Yukari, at the tender age of 17, is a renown Edo period novelist who claims visions of Yoshihara during the Edo period gush from his heart. After meeting Mahoro, a girl he swears he knows and has met before, Yukari finds himself falling asleep and waking up in the Edo period as an Oiran. The past and present collide in this time traveling romance.

Vyalen, the main character in the story, is a graduating high school student from their school.Their school was pretty known as one of the best athletic and academic breeding students. In other words, only those who have special talents, elite minds, and abilities could only enter the school. Each of the students were categorized according to their major fields-- like being an elite, academic, and athletic. But, for the school's first in history they were not able to categorize Vyalen for whom he has this unknown ability that allows him to "artificially" use or create talents that he's not even used to... Moving on, within only 12 twelve days he will be graduating from his high school. That's why he is in a hurry for confessing his love to her long beloved crush, Trixy. But suddenly one morning, on his way to school, he suddenly bumped into a puny little nerdy girl named Lnear. having the thought that he had heard this name somewhere... later on. He finally realized that it was a classmate of his that must be sitting next to him that never came to school since the first day of class...

Based on the Idolmaster Dearly Stars DS game.

Ryou has always had a problem with his feminine appearance. As a child he was often mistaken as a girl, and to his disappointment, that didn't change even after he got to high school. One day he came up with his best idea yet for gaining masculinity; he decided to become a male idol!

His cousin Ritsuko worked in the idol industry, so she was able to get him an audition. Unfortunately for his master plan, the company decided that he would make a wonderful female idol. Now, to even have a chance at becoming a male idol, he must first become successful as a girl!

The story starts off on a deserted island with a woman shouting "I ain't a chick!" while being chased by 100 male perverts in underwear!!!
Then it cuts back several hours earlier and we get to see how 'she' got into this situation.

It's a desperate struggle of survival on a deserted island between this woman and the different groups of men who are pitted against her, some of whom might turn out to be allies.

Junichi Sasaki joins his school's drama club upon entering high school. However, he soon finds himself dressing up as a girl for his first stage performance.