From CMX:

Souka and her recently divorced mother move to a new place to start over. In looking for a school to enroll in, Souka decides to leave her preppy, private high school behind and transfers into a technical high school. To her surprise, she's the only girl student in the entire school! The first day of school is nothing like she ever imagined -- boys crashing through the window, fighting for all they are worth. One day, the school's current "Bancho" (a term for a gang leader) ambushes Souka. Determined to protect her, Yu, one of the classmates, comes to her rescue, but Yu ends up in a struggle. Trying to help, Souka swings her book bag and ends up taking down the Bancho herself! What Souka didn't know was that when someone takes down the class' leader, you became the leader of that class. This wasn't a role she was expecting for herself, but will she be able to relinquish it?

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From Esthétique:

Due to family problems, Hirayama Souka tranfers from a private high school to an industrial high school. However, upon entering the school, she finds out that there are 850 boys in the school, and that she is the only girl there. Apart from the great disparity between the number of boys and girls, she also finds out that gangsters still exist in this era. Furthermore, a conflict has erupted between her classmate Katou Yuuni and the gangsters. Thus begins Souka's eventful life in the industrial high school...

That attack isn't magic, it's physics...

One day, a martial artist named Ash was suddenly reborn into another world. He decided that he will become a sorcerer in his second life.

He went through harsh training after becoming the apprentice of the former hero, Morris.

Then, the "Emperor of darkness" suddenly appeared!

Right when the end of the world was approaching, he one-shotted the demon lord?!

Before she died, Taga Reiji's mother made arrangements to ensure her son would not be alone. What Taga did not know about these "arrangements" was that he would be enrolled into a special class at the school his mother founded where prospective fiance candidates would all vie for his hand in marriage. How will Taga's new life of constantly being surrounded by girls unfold and will he be able to choose just one?

My classmate, Nogizaka Asuka, is absolutely perfect. She has excellent grades and is the most attractive idol in the school, and is universally recognized as one of the best. On top of that, she is familar with the Akiba-kei (otaku) culture and belongs to the AMW club, whose activities include manga, anime and games. One day, I was just a member of the group, but when I got involved with her "secret", things led us to develop an unexpected relationship...

Kanade Amakusa is a high-school student who is suffering from a curse called "Absolute Choices" (絶対選択肢, Zettai Sentakushi). This curse requires him to select an action from a list of two or three options that appear before him at any time, and has no control over what choices appear. Many of them are weird or perverse and as a result, the curse has tainted his reputation with his classmates and other people around him, making his life very difficult.

However, one day, a choice he makes on his way home from school causes a mysterious, beautiful young girl to fall from the sky. Amakusa discovers that she was sent from the God World to assist him in completing a series of missions given to him directly by God himself. After completing these missions, the "Absolute Choices" curse will be lifted from Amakusa; but should he fail in completing any of the missions, he will be stuck with the curse forever.

This spin-off focuses on the various side-characters from the main manga.

Kazuya is a 28 year-old divorced salaryman, who is convinced by his boss one night to go with him to a massage parlor. He does and meets a pretty young woman named Nagisa. He takes her card, but loses it when his aunt makes him help clean up the house in the front of the complex they live in (she's the landlord) so that a new boarder can come live with them.
Of course, it's Nagisa, and her 4 children, from toddler to teenager. Their father has died and she's doing everything she can to support these kids. Oh, and one more thing. She's only 21 years old, and may have never even consummated her marriage!

After the disappearance of his parents, Suzuki Tooru was all over the place and somehow ended up as a caretaker of a school dormitory in Tachikawa. The dorm building is all tattered. Its student boarders are all weirdos. And of course, there are rumors about ghosts haunting it too. Turns out, that dorm is connected to another world! Although Tooru doesn’t have a single friend in class, he can always just go to the dungeon to slay monsters and level-up. There, he befriended a slime, a female knight, and even a female sorcerer ♪ Thus, he begins another day of after-school club activities in another world!

From Nagareboshi Manga & Manga Abyss:

Ogasawara Aki is the reclusive, idealistic composer of the popular band Crude Play. Discontented with his life and with no drive to succeed, he meets Riko, the 16-year-old grocer's daughter in a band consisting of her childhood friends, and asks her to be his girlfriend on a whim. Riko, young and innocent, agrees immediately, but worries about her new boyfriend, whom she suspects has just broken up with a woman he cared very much for.

Rito is a high-school boy who just can't confess to the girl of his dreams, Haruna-chan. One day when coming home and sulking in the bath-tub, a mysterious and barely clothed girl appears out of nowhere. Her name is Lala and she comes from another planet...

Koharu, tired of all the men in her life being lying, married philanderers, decides to move back home, away from the city. Once there she finds her family saddled with a huge debt and no way out, until a handsome but creepy stranger offers to pay the debt, at the same time asking her to marry him. But, as if things weren't crazy enough, he already has two wives!

My brother started looking for people. He seems to be looking for a woman he fell in love with at a mask party. The only reference he has of that beautiful woman is only a small mole on the inner part of the thigh. And that woman is ... Ne-chan !? A love story given by a MC who can't be honest! Do not be fooled by the title! This is a pure love!

The story centers around Nyaruko, a formless Cthulhu deity of Chaos (Nyarlathotep) who can take on the shape of a seemingly ordinary silver-haired girl. Mahiro Yasaka is a normal high school boy who is being chased by a fearsome black alien one night, until Nyaruko saves him. She explains that the creatures from H. P. Lovecraft's works are actually races of aliens, and that she has been sent to Earth to protect him from being kidnapped by an alien trafficker. Eventually, Nyaruko and two other Lovecraft-creatures, Cthugha and Hastur, ends up being freeloaders at Mahiro's place.

It was in 1946 that Earth learned of the existence of other worlds. As expected, many countries immediately tried to send people into the other world, hoping to obtain vital resources or mystical treasures. None of them came back.

And to be fair, Souya never expected to be one of those explorers. But here he was, accepting an offer by a shady company to get enough money to save his little sister. Launched into another world, he soon finds that his journey will be a hard one - not only have his teammates gone missing, but a majority of his food and weapons supply was destroyed in the transfer.

The only way left to go is forward. With only an AI companion to guide him, Souya ventures forth, hoping to find something worthwhile that will justify sending a rescue party to save him - if such a party comes at all.

After cleaning the Calligraphy Club room one afternoon, Kiryuu Keiki finds a love letter addressed to him on the club's desk. Eager at the possibility of finally getting a girlfriend, he opens the envelope only to find the words, "I like you" along with a pair of the sender's panties.

With only these panties to go on, Keiki narrows down the identity to the four girls who helped him clean the club room that day: Tokihara Sayuki, the lazy third-year president of Calligraphy Club, Koga Yuika, a library committee member of foreign descent, Nanjou Mao, Keiki's slightly tsundere fellow classmate, and most awkwardly, Kiryuu Mizuha, Keiki's clean freak of a younger sister. Among at least three of these girls, Keiki believes is the one who left him the letter and their panties so with determination in his heart, he sets out to uncover which of these seemingly unorthodox ladies will become his girlfriend!

In the silent and lonely darkness, two moons shown in the sky of a world with limitless possibilities. a mysterious, weird, delighted clown, several federal unions of cities formed three powerful empires, where interracial unrest and disturbance of monsters are a norm, this, is the time when heroes are made. Humans struggle to regain the control of planet earth while armed with the highest level of ambition. At this time of importance, second year high schooler Senior, Student Wang, he uses the Fate Roulette to upheave the world, watch out people, here comes the Senior!

I was reborn as a princess in the world an otome game with memories of my previous life.
Wait, what? I'm the Heroine's love rival? You're kidding! I have no intention of falling in love with any of those pathetic guys, because the one I like is a support character, the Commander of the Royal Knights.

Except the Heroine, after being reincarnated in this shitty game where the support characters are way better than the love interests, is threatening to bring down my own life with flags, and I'm determined to strike them down.

In a world where witches are shunned and have been forced onto the brink of annihilation, a samurai with no memories is transported to the hideout of some of these witches. Having the name: "Dragon King" and a keen strategic mind, its up to him to help defend the witches from those that would seek them harm.

From Yen Press:
This seductive, paranormal romance demonstrates that love can have a way of coming back and biting you--in the neck! It's a lesson that Kana Takachiho learns all too well through her relationship with Aki, her childhood friend and pure-blood vampire!

Most people would freak out if their new apartment was haunted. But Gotou Seiichi actually welcomes the supernatural, as long as it's a cute ghost like Uehara Hinako. Seiichi comes from a family who has spiritual awareness and willingly chose the apartment after he heard rumors of a female ghost haunting the place. He instantly falls in love with Hinako who tries every trick she knows of scaring him out. But with every attempt, she makes him fall in love with her even more..

Yuiga Nariyuki works hard every day to obtain a full-college scholarship by his High School to support his poor family. His headmaster promises that he'll get it if he full-fills a small condition. He has to tutor two resident female geniuses Furuhashi Fumino (Literature-genius) and her friend Ogata Rizu (Science-genius), so that they can get into their dream-college. The catch is that Fumino wants to major in Science and Rizu wants to major in Literature despite them failing constantly in those subjects.