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She's quite a normal girl with a crush on a handsome boy but she has a hardon everytime she sees him.
Welcome to the life of Haruka-chan, a girl with a penis. Although it's not that uncommon in this world, she is still embarrassed by the fact. There is also a group of dickgirls in the school, and they found out her secret, what will she do?
From Baka-Updates:
In recent years, more and more girls are experiencing the development of "tertiary sexual characteristics" during the later years of their puberty -- that is, the rapid masculinization of a certain part of their external genitalia. Ooi Haruka is one such girl, who has until now kept the changes in her body a secret from everyone but her family. However, after an embarassing incident involving the guy she's been crushing on in a crowded train, she wakes up to discover herself at school, surrounded by a group of students calling themselves the "Bra Girls (Swing Girls)." And they know her secret!?

From Mangahelpers:
Keitaro Satou is 30, successful at his job...and single. With worries about his future, he decides to have an arranged marriage to satisfy himself and his family, yet while his perspective "wife" is a beauty, problems are bound to pop up!

Sakura Uehara, who is 30, has been so devoted to work that she hasn't even dated since high school. Not able to go to university, she went straight to work, and was determined to show everyone she is just as good as those "college assholes" the company va

Kaoru is a 17-year-old virgin who has an SM fetish. He secretly dreams about an SM relationship with his childhood friend Nana. One day Kaoru's mom asks Nana to hide all his SM toys so he'll study for a change. However, Nana finds the leather one-piece that Kaoru bought and tries it on, but she accidentally locks it and doesn't have the key! The beginning of super strange relationship.

Due to the popularity of Nana to Kaoru, the series resumes publication in Young Animal and chapter 22 is the final chapter in Young Animal Arashi. Publication of the series will continue in Young Animal, but renumbered as chapter 1 while maintaining the same name and storyline.

Summer vacation is approaching, but Nana has no time to look forward to that. Entrance exams are also coming up, and she's fretting over her worst subject. An encounter in the library provides a solution in the form of an invitation to study with Tachibana. Japanese history, that is.
Meanwhile, Kaoru encounters the author who he reguards as his mentor in his favorite subject. That's definitely not Japanese history.

Plot: The woman Tsutomu encounters in college was older and smaller than he is, and for some reason, looks like the same girl in his dreams. The heart-pounding love affair between him and the "older woman" begins.

Eri Inui is a 20-year-old college student aspiring to become a mangaka. She has been following this dream ever since she was little and has been the best artist among all her friends. But she still hasn't found a publisher willing to take her under her wing.
One day, however, Souta Inuzaki, the son of a distant relative, comes to live with Eri and her mother. Souta is an aspiring violinist and has come to Tokyo to practice. Eri sees a lot of herself in the young Souta. But how will she deal with a 13-year-old boy following his dreams and going through puberty?

This “Arashi” series begins 8 months in the future of YA, with Nana and Kaoru in the summer of their final year of high school.
This series uses a different support cast & different location setting than the original serialization, and as such it doesn't really spoil anything from the main series.
Nana to Kaoru (Prequel)

Plot: Kudou Yuusuke has to deal with the most annoying childhood friend in the world. She's Miyauchi Misao, and she wakes him up every morning, hangs all over him all the time, and generally follows him around like a loyal puppy. It's started to get a bit awkward now that they're in high school, and she's a bit more... womanly... than she was when they were children. Everyone at school just assumes they're dating, so it's killing Yuusuke's chances with the ladies.

One day Yuusuke has a shock waiting for him; Misao has gotten engaged! She says that she's set to be married in spring, but she seems comfortable hanging all over Yuusuke in the meantime. The unfamiliar jealousy that the news has awoken in Yuusuke has spurred him on to making his own plans. He's going to try to become popular, and get a girlfriend, before Misao gets married in the spring!

*Currently on Hiatus*
When the Wischtech threatened to invade the fiefs of Szaalanden, the Emperor dispatched fourteen youths. Of these, the Seven Heroes halted the invasion to herald a time of prosperity while the four Lances of Betrayal were supposedly defeated.
Two decades later, the Lances of Betrayal have reappeared and formed a bandit militia near the frontier fief Gormbark. A man with a black sword and a scar over his left eye slays an entire troop of that militia. He is identified as the boy, Kóinzell, and becomes as much an object of fear as of hope even as his own past, motivations, and purpose are a mystery to those he meets on his journey.
From Volume 0's back cover (SBM's translation):
"When the black sword roars, everything that stands before it is crushed . . . ! What is the purpose of a boy Kaintzel who possesses transcendent sword skills? The battle with the "Lances of Betrayal" that were supposed defeated by the 7 Heroes... And the astounding truth that is revealed after the battle."
Volume 0 encompasses a plot arc which leads directly into the main plot of Übel Blatt in Volume 1. It also introduces and develops the attitudes and motives of a few other characters aside from Kóinzell.
From Suvi of IIDX, Heartfang and Hinokaze
20 years ago, 14 heroes set out on a journey to stop the Wischtech threat. Three perish along the way and four abandon their mission and are labeled hence forth as the Lances of Betrayal. The remaining seven heroes destroy the Wischtech, fulfill their sealing mission and rid the world of the Lances of Betrayal. They return and become the pillars of support for the rebuilding of the empire. So forth the prestigious era starts.
Although the Lances of Betrayal were thought to have fallen, they return and begin forming a powerful army on the frontier. They pillage the towns, ravage the lands, and become the object of fear within the empire. Only a young man named "Koinzell", holder of the "Black Blade", has the power to annihilate these "Lances of Betrayal". Who is Koinzell? What is the object of his journey? Where did he come from? Could he be connected to the "Seven Heroes"?

“'I’ll create a witch!!”

During the 17th century, the German alchemist Johann Schultz successfully created a witch. He then injected that power into his own blood.

In the present day, as a result of a scheme created by his cousin, Yomoda Rena, Shurutsu Kenichi, a high school student and a third generation German, fights on secretly as a blood relative of "Brocken", all in order to hunt down those who abuse the artificial witch theorem. Yet for reasons unknown, he transforms into a Magical Girl "Heroine"...?

"13 years ago, an unknown object appeared at Shinjuku. That creature regularly gives birth to a demon. Therefore, our world is being eaten clean."
The military found a weapon capable of fighting these creatures, a special power known as "exex" that becom

When the Wischtech threatened to invade the fiefs of Szaalanden, the Emperor dispatched fourteen youths. Of these, the Seven Heroes halted the invasion to herald a time of prosperity while the four Lances of Betrayal were supposedly defeated.
Two decades later, the Lances of Betrayal have reappeared and formed a bandit militia near the frontier fief Gormbark. A man with a black sword and a scar over his left eye slays an entire troop of that militia. He is identified as the boy, Kóinzell, and becomes as much an object of fear as of hope even as his own past, motivations, and purpose are a mystery to those he meets on his journey.
From Volume 0's back cover (SBM's translation):
"When the black sword roars, everything that stands before it is crushed . . . ! What is the purpose of a boy Kaintzel who possesses transcendent sword skills? The battle with the "Lances of Betrayal" that were supposed defeated by the 7 Heroes... And the astounding truth that is revealed after the battle."
Volume 0 encompasses a plot arc which leads directly into the main plot of Übel Blatt in Volume 1. It also introduces and develops the attitudes and motives of a few other characters aside from Kóinzell.
From Suvi of IIDX, Heartfang and Hinokaze
20 years ago, 14 heroes set out on a journey to stop the Wischtech threat. Three perish along the way and four abandon their mission and are labeled hence forth as the Lances of Betrayal. The remaining seven heroes destroy the Wischtech, fulfill their sealing mission and rid the world of the Lances of Betrayal. They return and become the pillars of support for the rebuilding of the empire. So forth the prestigious era starts.
Although the Lances of Betrayal were thought to have fallen, they return and begin forming a powerful army on the frontier. They pillage the towns, ravage the lands, and become the object of fear within the empire. Only a young man named "Koinzell", holder of the "Black Blade", has the power to annihilate these "Lances of Betrayal". Who is Koinzell? What is the object of his journey? Where did he come from? Could he be connected to the "Seven Heroes"?

After his mother's death, Miwatari Yuu returns from Tokyo to live with relatives in the city of his birth, Ousuku. Yuu is the latest of a line of Shinto priests that stretches back generations. After his arrival, he runs into a strange girl who seems to be searching for the Northern Lights. Yuu saw the Aurora as a child, though no one believed him, and his mother had told him it was the armor of the Valkyries traced across the sky. Yuu's destiny is interwoven with this mysterious girl and the aurora, and he will not be able to help being drawn into a battle that involves both gods and humans!

From MangaHelpers:When an enemy explosion leaves private military soldier Terawaki Ryo nearly dead, a secret organization rebuilds his body using the research they have done in human revivals. Unfortunately for him, the technology only allows him to come back in the form of a teenage girl. His new identity, Shibahara Kyoko, leaves him distraught as his frail body doesn’t allow for the combat skills he used to have or even pick up heavy artillery he used in the combat field. Kyoko is assigned to protect a prestigious academy where daughters of powerful leaders attend since the girls’ presence makes it a hotspot for terrorists to attack and blackmail the people in power. Lead by his former commander and mentor, Major Honjo who has also been reborn as Ryo, was a beautiful teenage girl named Chujo Shizuko, and the pair work together as anti-terrorist teenage school girls

Reesha was once a prince of a powerful dynasty, but after the end of a war, his home is no more. In the the first three years of Reesha's new life, he went to school with some of his family's former subjects, now his friends. However, after they graduated, they all joined the military. Reesha's small size, due to his artificial heart, has prevented his acceptance into the military for three years running. Now, 19-year-old Reesha is living as an ordinary plumber in a town of hot springs. In order to help Reesha get around the size requirement, he and his military friends sneak into a bathhouse to appeal to the general directly. Unfortunately, this plan results in a series of unexpected, violent events which cause Reesha to finally depart his everyday life and head off to chase his destiny! [tethysdust]

From MangaHelpers:

Reesha was once a prince of a powerful dynasty, but after the end of a war, his home is no more. In the the first three years of Reesha's new life, he went to school with some of his family's former subjects, now his friends. However, after they graduated, they all joined the military. Reesha's small size, due to his artificial heart, has prevented his acceptance into the military for three years running. Now, 19-year-old Reesha is living as an ordinary plumber in a town of hot springs. In order to help Reesha get around the size requirement, he and his military friends sneak into a bathhouse to appeal to the general directly. Unfortunately, this plan results in a series of unexpected, violent events which cause Reesha to finally depart his everyday life and head off to chase his destiny! [tethysdust]

16-year old Saji has nothing better to do than fantasize about beautiful young women all day. But he has his heart set on winning the affections of the school's headturner, Koizumi Akira. Problem is, the said girl won't even give him the time of the day.

Kondou Takeshi is a new rookie police officer who now works to capture criminals of all different kind working together with Miki and all the other police officers which seem to be all women.

Plot: Kondou Takeshi is a new rookie police officer who now works to capture criminals of all different kind working together with Miki and all the other police officers which seem to be all women.

This story is about a (un)lucky guy who gets sadistically and sexually tortured in unconventional ways.

Plot: From Facepalm Scans: A slice-of-life book about three girls: Misaki, Yuki and Haruka.

Quoted from 4dawgz (the scanlator)-
"So there's a magazine called Gelatin where various manga artists are given some coloring crayons and then told to draw whatever they want in full color. The plot for this is about a guy and a girl who go on a mission to retrieve a pair of shorts from an island... aaaaand that's it. All you'll find is a nice slice-of-life story and lovely colored pages." 

Sanctuary is an top-class cafe that caters only to females. Manager-san can spot any intruding male, even in the most cunning disguise. Or can he?

In order to be bought by a rich family, Narumi Inoue, hiding the truth that he is a man, goes to a girls' school. As a trainee, Narumi was sent to serve a girl from a rich family who hates maids (only weekends)! Keeping the 'heart of treating/serving people,' Japanese maid, Maid in Japan, Narumi's battle will start…!?
If it is found out that Narumi is a man, he will be castrated. Don't miss the cross-dresser maid boy's love and sufferings while serving!

In a world where humans co-exist with Juujin (literally: beastmen), genetically mutated animals that have remarkably human-like features with the exceptions of extremities such as tails and ears, Juujin are often found as laborers in the work force or raised in households as pets. That is until a new kind of Juujin appears - Evolutions, EVOs for short. These Juujin have special magic-like powers that they are using against the human race.

Peke, one such EVO, has been raised with her master Yamato Yamamoto. Yamato's mother works for the Health Care Center - the only agency with jurisdiction over the Juujin, and has developed a special collar that can seal the EVOs' powers. Having used this collar to control Peke's own powers from going berserk, Peke must now release this power to fight and capture the rampaging EVOs to save humanity and to win her master's love.