Takuma Miyabe is a boy from an island who moved to Tokyo because his island doesn't have a high school there. However, the ratio of male and female is 1:9. There are too many female students in his class, and as a result, they "flirt" and torture the still innocent Takuma.

From Okazu:

Mermaid Line is a collection of stories that ran in Yuri Hime magazine. They are collected together as short mini-series, done in an episodic, almost soap-opera-y way.

In "Megumi and Aoi " Megumi confesses to her friend Aoi that, despite her ungainly swimming, she feels as if she is a mermaid. Aoi finds herself fantasizing about being the prince to Megumi's mermaid, but Megumi runs to the arms of a boy, trying to put a beard on her feelings.

Ayumi, in "Ayumi and Aika," wants to get married to her boyfriend so naturally, she's shocked when he tells her that he wants to become a woman.

"Yukari and Mayuko" are both OLs. Mayuko's between boyfriends and bored, so she asks Yukari to pretend to be her girlfriend. It works out well, until Yukari realizes that her feelings for Mayuko are more than just pretend.

In "Girl*Girl," an extra story in the "Megumi and Aoi" Mermaid Line series, Aoi contemplates what things would be like if she or Megumi were guys.

And finally, in "Miura-san and Me" Okabe loves Miura's beautiful hair. When Miura-san cuts it all off, Okabe learns to love her for herself.

From Shoujo Crusade:

Miki always gets turned down so she frequently seeks consultation in love from the convenience store's shop assistance Azuma. Will that be all their relationship ever be?

From MangaHelpers:
Minami Eita lives with his older, book-loving brother, whose long-time girlfriend Arumi is often around the house. Minami tries to get along with Arumi, but the truth is that he likes her much more than is appropriate. Even though Minami doesn't read much, he helps in the library with his bookworm classmate Shinonome Yuuko, who loves short stories. She thinks that while most people want to think of themselves as the hero of an epic saga, short stories are much more like their actual lives. Minami's ordinary life becomes more confusing when he begins to suspect that he has feelings for Yuuko. One day, he finds out her secret--she is actually a published author of short stories! Her publisher wants her to write a novel, and she has enlisted Minami's help in an unexpected way. Minami's teenage life is not going to get simpler anytime soon.

At the young age of 18, Erai Tenka is the president of a highly successful IT company and is filthy rich. He has everything he wants, except for one thing: a girlfriend. The truth is, he is desperately shy around women. He is attempting to get over his shyness by hanging out with a team of bunny-girls, but it hasn't seemed to help.

One night, Tenka goes out walking alone and is very nearly mugged. Luckily, a girl shows up and rescues him, and Tenka falls in love with her at first sight. It turns out that she's a student at his little sister Yuika's high school, so Tenka enrolls immediately. Unfortunately, his crush, Himuro Sai, thinks he's a creepy, perverted stalker, and he's too flustered around her to explain himself! He'll have to get over his shyness if he wants to have a chance to win Sai's heart!

Seven men have entered a school exclusively for girls. Irie, a man who fantasizes about his own harem, feels a great dislike towards Koga, the No. 1 popular ikemen at the school, so he always try to avoid him... But a rumor starts to spread that Koga liked Irie"...!? The garden of a pure maiden opens, to make way for a love battle! An extraordinary high-school love story!

It has always been a one-sided love for Kima. Kima had slept with many guys since high school. However, Furudate was the only student he'd ever loved. Neither has he done it with Furudate before, nor confessed his love to him. One day his mother's lover, Ishiki, appeared before Kima... and so, this unbelievable yet physically and mentally heartbroken love story is presented!

Natsume Kanade wakes up with a terrible headache from the day before unable to remember who he is. Being confronted by a strange man with dark-rimmed glasses who calls himself "God" and being told that he is a high school teacher doesn't help. Stranger yet, everyone seems to know what happened yesterday - everyone except him.

1-4) Continuation of Nemurenu Yoru ni Nomikonda Hoshi from Ukkari Cherry.
After finally winning Sawa's heart and becoming his lover Shiroi still can't let himself be at ease--the more he's with Sawa, the more he realizes how frighteningly close Sawa and his best friend Micchan really are. And it doesn't help that Sawa seems to invite Micchan to go with them every time they can be alone. How can Shiroi make Sawa prove that he's really number one in Sawa's heart.

5-6) Love Letters
When Kotera was in his 3rd year of middle school he got a confession from a guy 2 years younger than him, unfortunately his friends where hiding in the bushes watching. Causing the younger boy to bullied relentlessly by his classmates. What will happen years later when they meet again?

7) Kira Kira
Miyoshi has been with Maki since high school and years later they've started dating and now living together.

Extra
Micchan gets a confession. What are his thoughts on the confession and on Shiroi and Sawa's relationship?

From Liquid Passion:

1-4) When Ryuu transfers to Hitomi's school, he leaves an immediate impression on him. Curious about rumours of a full-scale tattoo on Ryuu's back, Hitomi starts getting closer to him. Before long, the friendship and fascination Hitomi feels for Ryuu start developing into more, but before he has a chance to come to terms with his feelings, Hikaru appears on the scene.... and he has his eyes set on Hitomi.

5-6) Now that Hikaru has become close friends with Hitomi and Ryuu, the group dynamics have changed. When Hikaru expresses his growing interest in Hitomi, will Ryuu admit his feelings or let Hitomi slip away...?

7-8) Ryuu seems to have found comfort in other places as Hitomi and Hikaru Taira get further involved. Sexual frustrations finally find an outlet, though misdirected.

9-11) In a startling series of events that lead up to Hydra's transfixing climax, hearts break, enemies resurface, and ties of friendship bind the trio in a complex web of struggle, sacrifice, and redemption.

Part of Rules / Hydra Series

Kotarou Hayasaka is a new student at Oomiya High School, a prestigious boys school where the student council president is able to make a single school rule at the beginning of the year. This year, the student council president Izuki Jinguuji decides that all the students have to cross-dress during school activities, much to Kotarou's dismay.

From Chibi Manga:

Hanako, who's living in the dormitory for girls, will be in big trouble because the girls dormitory will be combined with boy's dormitory...

But she can't accept that!

---------

From Shoujo Sense:

Hanako doesn't have much experience with boys, so when she finds out Bara High (and its adjoined dormitory too!) is becoming co-ed, she becomes excited. But the first boy she meets is the top student from the boy's school, Kakeru, who turns out to be not as nice as he seems, and declares that he will make Hanako share a room with him! How will Hanako deal with this mess?!

Ken and Yuu are childhood friends, they have always been together, they went to the same kindergarden, the same elementary school, the same middle school and now the same high school. Ken is really good at soccer, but he's hiding something from Yuu. What is it?

Zankoku na Kami ga Shihaisuru portrays the tale of two step-brothers - Jeremy and Ian, as they strive to discover their separate paths towards redemption.
Jeremy, a sensitive but outgoing 17 year old, is delighted to hear the news of his neurotic and excitable mother's remarriage to a wealthy British man. However, much to his horror, his sweet-talking new step-father Greg, soon begins to exhibit a disturbing trait...he is a sadistic pedophile and loses no time in making Jeremy his target. Months of horrific, systematic abuse drives Jeremy to desperation; he sabotages his step-father's car with the hope of eliminating him. The resulting accident, however, kills his mother along with Greg.
Jeremy's shocked and guilt-stricken behaviour arouses the suspicions of Greg's free-spirited son, Ian. He unearths enough evidence to tie his step-brother to the crime; but in doing so, also discovers the details of Greg's sexual abuse of Jeremy.
Caught in a moral dilemma -- between punishing the criminal and atoning for his father's sins, Ian soon finds himself haunted by lust for Jeremy. Is it lust...or love? He wonders whether he shares his father's proclivities, but finds himself helpless to resist being drawn into a passionate and painful relationship with Jeremy.

Note: Won the first Osamu Tezuka Culture Award Excellence prize in 1997.

In the near future on the starship Galaxy, Sheryl Nome lived with her parents Abel and Sally. The government tracked her parents down who were rebelling against mandatory human enhancing implants and Sheryl was the only one who got away alive. Barely surviving on her own on the streets, Grace O’Connor, a manager at a talent agency brings her in to make her a star. Several years later Sheryl is enrolled into the Erato Music School where she meets Amagi Lilies, a brilliant singer and they become friends. However, tragedy strikes and Lilies dies trying to save Sheryl. To make sure her parent’s sacrifice was not in vain and to keep her promise with Lilies, Sheryl enters into the entertainment world to become the greatest singer in the universe.

Sakurai is caught masturbating by his classmate, Shinohara, while watching an AV he borrowed from a friend. Trying his best to pretend nothing ever happened, he can’t help but look at Shinohara. Now that the both of them have become aware of each other, will one end up falling prey to the other’s desires..?!

From Midnight Scans:

At the end of the second semester, a teacher came. Everybody in class quickly opened their hearts for the childlike adult, Jiro-chan. Kokoro knew that Sensei loved her because he asked her for help. However, Fuwa-kun, the one I love, hated Sensei.

Kae, who can’t seem to be as honest as she’d like to be, and Hiroto, self-conscious about his (lack of) height and childish appearance, are known for bickering all the time. Kae has kept her crush secret from Hiroto, but when he returns from summer vacation a tall and handsome flower boy… will she finally be honest about how she feels?

From Jshoujo Scans: Yorika Senoo is taking a picture of Yousuke Shiiba, the guy she likes playing soccer on her phone. She is then hit by the ball giving her the chance to finally talk to him. She returns home to have her dreams crushed as her father is being transferred to London. Not wanting to leave the chance to know Shiiba behind she decides to stay in Japan. Her worried parents allow her as she makes her way to her new share-house with a girl named Yuki Yoshihara...but when she arrives turns out Yuki is a guy not a girl, and his name is Yutaka Yoshihara. She got the kanji confused.