From MangaHelpers:

Shun knew what to expect when he became a high-school student. As he entered the gates of his new school, four beautiful girls suddenly surround him. These four girls are the same four girls he grew up with since kindergarten. The four girls are Rio the athlete, Miku the cook, Nana the nerd, and Yuri the student president. These four girls will be battling it out between them in order to win the heart of their beloved Shun.

The story is set at Shishidou, a school attended by rich and elite people. Tomu Shirasagi, a gambler, is a mysterious new transfer student who has come from a public school (instead of a prestigious private one) and faces the elitist environment. There, he declares a challenge toward any student and claims he will bring to the ruin the whole school through a series of gambling matches. Nobody knows why he has come to that school or what the real motivations behind his actions are.
During any match, Tomu shows off all of his unique coolness and ability.
He employs a wide range of tricks, both psychological and physical, to ensure his victory. In any game, you will constantly ask how he's planning to win, why he's really doing certain things, and what's really going on. At the end of the matches, the tricks are revealed, and they all work in real life, even if they do require one to be highly skilled or lucky in order to perform them.
The story centers around the various matches he undertakes and the interactions between the various characters, like Mika Shishidou, the beautiful granddaughter of the school headmaster, who is highly intelligent but contemptuous and superb, or Abidani, the vampiric looking dorm superintendent and main villain (for now) in the series, who has a sadistic personality and whose goal is to make Tomu leave his school (or to get him killed).
As the story unfolds, more about Tomu's past is revealed, leading to unpredictable turns of events.

N/A

Three boys are desperately struggling to "make" a girlfriend in their sad adolescent lives. They then realize that their classmate, Ghang Han-Gyul - the manly, serious, quiet person of their class - has been secretly going out with a beauty for 100 days*. This triggers the friendship between the manly, serious Han-Gyul and the three dateless losers. *A 100 day celebration of a relationship is seen as very significant.

A collection of oneshots:

1. Three-Second Rule
2. Sitting Behind the Girl I Love
3. Love Me Softly
4. Erasing Love and Wishes
5-7. As Yet I Have No Name
8. Recalculation
9. Prologue - Hidden Name (also included in Junsui Adolescence)
10. Interim Solution

"Faithful to our instincts, we are animals! Come take a look at our animal high school lives." In the middle of the forest, there is a all-boys school. Students learn and live regular lives…that is if they can survive to the end! This school isn’t just some ordinary school for humans, but rather a place animals go to educate themselves in the art of being human. We follow Oh Daram (name meaning Squirrel) as he starts classes in the first year they finally integrate herbivores into the student body. Insanity ensue as his best friend, Kim Neukdae (meaning Wolf) continually tries to get a little taste of Daram’s tail, a new baby duckling joins his family, and his classmates behave like the rambunctious animals they are. Is anyone really ready to be human?

From Starry Heaven:
"Exactly, what am I?" A human-made robot that is used for battles meets a blind girl, Lilina, while running away. He is slowly captivated by Lilina as she doesn't see him as a robot, but suddenly someone who targets the both of them appears? Moreover, Lilina also has a secret of her own?

Also included:
Desert fantasy of a king and a dancer girl, Moonlight Romance. A forbidden love between an elder sister and a younger brother, Red thread's 2nd compilation.

Mogami Himoto shouldn't have any problems. He's rich. He's smart. He's athletic. He's incredibly attractive. He's an "ikemen."

Meeting Yaenami Yukka plunges his life into chaos. First, she mistakenly accuses him of molesting her and broadcasts the news to the whole school. Then she ropes him into pretending to be his fiancee... which might not be so bad if not for the self-defense mechanism which results in her punching any ikemen who comes close to her. And then there's the curse...

From Evil Flowers:

Inoue Azusa's classmate, Saito, is extremely good looking, but he has the worst personality ever. For some reason, he started noticing Azusa and gets her in a lot of trouble. Although he's very annoying, Azusa gradually becomes attracted to him. However, Azusa's classmate, Hikaru, is not only handsome and is the president, but towards Azusa he is...?!

Yuu has just begun her first year in high school but has still not yet responded to a middle school graduation confession by a boy who she has always liked, but who's confession did not excite her. Yuu loves shoujo manga and she knew how confessions were supposed to feel, but she didn't feel it and she has not found a way to respond to him in months. Yuu then sees Nanami the student council president turning down a confession very thoughtfully. Yuu later discovers that Nanami has never accepted a confession because none made her feel something. Inspired by Nanami's honesty and their likemindedness, Yuu consults Nanami, but after helping her, Nanami confesses to Yuu!?

He hates to lose and is a little shorter than other boys. A little cheeky, but when he smiles, he's really cute. This is the Miyamoto that Hitomi loves so much. Just before the entrance exam for high school, she has two chances to make a confession. But she is dazzled and doesn't really have to courage to do it, so she decides to leave it for after the exam. Or at least that's what she thought... This is a very popular story about love, which makes the heart go "kyaa"!!

From Yen Press:
When fifteen-year-old Kaho Nikaidou leaves her sheltered home to start life anew in a Tokyo high school dormitory, the last thing she expects is to nearly get hit by a truck! Saved in the nick of time by a handsome stranger, Kaho falls head over heels for him and, after finally tracking him down, boldly confesses her feelings. Turns out Kaho’s mystery savior, Kanade, is the son of Kaho’s new landlord! The handsome object of Kaho’s affection agrees to go out with her, but her newfound bliss is short-lived when it turns out that her new boyfriend…is a fifth-grader?

• Nostradamus to Sakaki-kun
A girl meets a boy who can see the future — what will happen?

• Himitsu Mittsu

• Tonari no Kanata

• Keep a Diary

What if you spotted your ideal beauty at the train station and confessed your love immediately? What if that beauty turned out to be a guy and moreover a homophobic one? What if you two ended up in the same high school and if he caused everyone to mistake you for a homo? What if you still couldn't leave him alone?

Well, that's the kind of story it is.

Yukiteru is living with his family friend Yuno after a fire burnt down his home as a child. They live their life until a fellow classmate Rena who is jealous of their close friendship makes a surprise move.

On one particular day, a high school student, Shuichi, saves a magical fairy Sylphy from drowning in a pond. When Sylphy offers to grant one wish out of gratitude, Shuichi immediately asks for a “cute childhood girlfriend.” Sylphy then turns Shuichi’s childhood male friend, Iori, into a girl…! The newly female Iori is surprisingly cute…!

From September Scanlations:

Kuzunoha is a Fox, a member of the Vulpine Faction at his school for Beastlings, and while he gets along well with his kind and the Feline Faction, the Lupine Faction scares the mess out of him because they still practice the ancient rite of pelt reaping, where in traditional ceremonies they skin their fellow beasts. But when he wanders into the forest on an urgent errand and winds up stumbling into the middle of a hunt, he must rely on the help of a Wolf classmate of his to reach safety, because Kuzunoha isn’t all he appears to be at first blush…

From DeNA:

Our protagonist Haruka has been given the gift of precognition. He’s led an ordinary life so far, without really giving question to his special ability. However, one day, he foresees someone close to him die in an accident while travelling. It’s only after he sees this insufferable vision that he gathers the determination fight against the future, but… in such an unthinkable way. What will the future hold after Haruka rises up against a fate that’s already been decided…?

Suwa is perfect. She has perfect grades, perfect looks and is the idol of everyone at her school. However this "perfection" has created an odd distance between her and her fellow classmates. That is except for Takeda, the boy who sits in front of her in class. It seems Takeda is the only person that is able to speak to Suwa normally and much to her chagrin he is starting to think she is not all that perfect.

Gosh?sh?-sama Ninomiya-kun's story revolves around Shungo Ninomiya, a male high school student trained in difficult hand-to-hand combat. He lives in a huge house with his older sister Ry?ko, who is almost always gone on some dangerous mercenary mission. One day, his sister sends Mayu and Mikihiro Tsukimura, two siblings, to live with him to help Mayu overcome her fear of men. Unfortunately this is accomplished by making Mayu and Shungo share the same room, bathe together and even sleep together in the same bed. Making things even worse, Reika H?j?, the student-council chair, is blackmailed into becoming their maid due to a video that Ryoko recorded, in which she tries to seduce Shungo. ~from Wikipedia From Baka-Updates: Shungo is a normal high school student living in a huge house. One day, his sister Ryoko sends Mayu and Mikihiro Tsukimura, two siblings, to live with him to help Mayu overcome her problem. Mayu's problem: androphobia (fear of men), and Ryoko wants Shungo to help her overcome it. How? By making Mayu and Shungo share the same room, bed, and even take baths together. To make things even worse, Reika Hojo, the student-council chair, somehow ends up becoming their maid.