When you look in the dictionary for "uptight" the definition is Misao Moshiki. She's head of the school Disciplinary Committee, and if you take one step out of line you're history. Until she zeroes in on school playboy Subaru Shibatani. In her zeal she accidentally ruins his shirt. In return he tells her he'll keep quiet about it if she goes with him to the beach on Saturday. Misao's world is coming apart at the seams--or is she finally coming out of her shell?

[From ShoujoMagic]: Chitose is eager to fall in love, and she thinks she's found the perfect candidate in Yamato. Yamato is good-looking, considerate...and a little bit of a delinquent! Chitose discovers that Yamato takes money for kisses and dates! Chitose wants Yamato's lips for herself, but she has absolutely no intention of paying for them. Look out, Yamato, because Chitose -- a refreshingly spirited heroine -- is out to Get Chu!

Before entering High School, Ei and Yuuji had always been good friends, but it all started after Yuuji confessed to a girl and was rejected. The relationship between Ei and Yuuji has delicately changed. Boy’s worry when falling in love… particularly when the partner is also a "boy". What should they do...? (from c-t)

Enjiro is a talented baseball player, but has to quit due to a 100 million yen debt. Komado's family runs Benten High School, but the school is on the brink on bankruptcy and (for some strange reason) the only way to save it, is to win the National High School Baseball Tournament (a.k.a the Koshien Tournament).
Seeing Enjiro as their savior, Komado offers to pay him 100 million yen, if he joins the school's baseball team and wins the Koshien Tournament.

High-school student Nanamura Hikaru has little memory of his deceased father, a famous playboy actor, until his father's suave attorney, Shimogura, contacts him with the promise of a sizable inheritance. The catch? Hikaru has to make contact with his eight half-brothers - the fruit of his father's philandering ways.

Saikawa is a teacher at a fine-arts prep school. His colleague, Nashimoto, is a great guy and always stays by his side for him. Looking at Saikawa so depressed after holding his wedding yet breaking up even before submitting the marriage registration, Nasimoto instinctively gives him a kiss. Nashimoto who realized his feelings for Saikawa...!?

Hasumi from From Yesterday makes a cameo appearance as Saikawa's friend.

Included Oneshot "And the Rose Coloured Days"

From Shoujo Sense:

I've been watching you attentively from close by... because I fell in love with you.
Only once... although we have spoken only this one time.

Haruka Kotoura is a 15-year-old girl who can read people's minds. She has been suffering from troubles caused by her mind-reading ability, and her parents got divorced as a result. She moves to a new high school but tries to keep away from her classmates. Yoshihisa Manabe, one of her classmates, accepts and appreciates her ability and she begins to interact with her friends with his help.

Kyotaro is just an ordinary guy trying to lead an ordinary high school life, despite the fact that he is the son of a yakuza boss. Then comes Kumiko, his half-sister he's never met before, who's looking for a man with a centipede tattoo who killed her loved ones in the past. Will Kumiko and Kyotaro be able to manage their family business? Will Kumiko ever find and take revenge on the man with the centipede tattoo? And will they be able to control their sexual urges for each other?

From MangaHelpers:

Gekibuno is a 4koma comedy centered around Kuramoto Souya, a new transfer student to the high school. Souya is the kid in the class that no one pays attention to. He has no personality, is always depressed, has no hobbies or is not involved in any extracurricular activities and is just plain boring. He wants to be different at this new school and start on a fresh plate but unfortunately life isn’t that easy and he goes back to his old self. Souya is coerced into joining the drama club, where the most colorful characters of the school reside. Will this drama club be able to transform Souya into a different person? [vyc]

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Kuramoto has just transferred to a new school, which has a Drama Club with a touch of mystery around it.

Kuramoto has a retiring personality, and he feels like his existence is barely noticed by others. He wants to change all this, so he joins the Drama Club.

But soon... he regrets! Commencement of a stupid comedy!

From AnimeNewsNetwork: After having been attacked by an alien, saved by a girl, and having discovered that he has extraordinary powers, Shun Ukiya has had a hell of a first day of school. Realizing what this new power is all about is not his greatest concern, though, as there are more important things that threaten Earth.

From Project H:
Sakura Keita, a university student, is in dire straits when he drops a graph critical to passing his class. However, he is rescued by his fellow student, Kurimiya Honoka, who manages to recover it for him. The two hit it off immediately, but will Keita really be able to hold on to his dream girl?

Shirayuri Girls' High School is a high school like any other. It has its own rules and regulations, and of course, you'd expect a Student Council to help maintain them. The Student Council itself, however, is a different problem entirely.

A perverted President who likes girls, a tsukkomi Vice-President, an over-zealous Treasurer and a quiet, brooding Secretary. This unlikely quartet form Shirayuri Girls' High School's Student Council.

What could possibly go wrong?

From Lililicious:

The protagonist of "Girls' Lives" knows that her feelings for the school idol are different from everyone else's.

From Girls' Generation Scanlations:

1) Kitagawa gets confessed to by the popular, Yamamoto. Taking advantage of the situation, he accepts and they start going out. But, Kitagawa has a secret that he would die before letting Yamamoto know about... Can their relationship work out, or will the secret be exposed?!

2-3) Keisuke have been friends with Atsushi, the ace of the baseball team, since middle school. One night, like any other usual one, Keisuke crashes at Atsushi's place after gaming away, only to wake up to Atsushi calling out his name while masturbating.

4) After catching himself staring at Suou's sleeping face, Ayumu noticed his more-than-friends-feelings for Suou. Knowing that this love would be fruitless, Ayumu resigns to his fate and begins to avoid his friend... which doesn't exactly sit well with the person in question.

5) No one else offered to help him besides the president of Student Council, Nishida. That's why Kazuya couldn't help but fall in love with the gentle and princely Nishida. However, his meek nature makes talking, let alone confessing, to the object of his affections all the more difficult. So he seeks Nishida's scary second-in-command Tamaki for assistance.

Extra) Kitagawa and Yamamoto picks up from where they last left off.

From Divine Sanctuary:

Having to move schools from the Countryside to Tokyo, Chinami realizes that 'being like a girl' is quite vastly different?!

N/A

From Kotonoha:

Penned by Masaya Hokazono (Inugami, Watashi wa ai) and illustrated by Court Betten (Prince Standard, Harukaze - Bitterpop), Girlfriend features charming and sexy short stories involving romantic relationships between high-schoolers in contemporary Japan.

From MangaHelpers:

Ichinose Kouta is transferring to the academy his grandfather runs. He knows little about it, except for the fact that the students are mostly female, so he imagines that his life will soon become a delightful harem-type story.

When he gets lost on the way to the isolated school, he finds out there's a lot his grandfather didn't tell him. The school is actually an all-girls school for ninja! At first, the girls think he's an intruder, and he barely escapes with his life! Luckily, the misunderstanding is cleared up, and he finds himself under the protection of the beautiful and deadly student council president, Fuyunagi Rindou.

But even now, his life will be anything but uneventful, as he finds himself in the middle of an ongoing conflict between Fuyunagi's student council and another student group, headed by a girl known as Momochi Yayoi. [tethysdust]

Very few people know that one of the country’s leading erotic novel author is 15 year old Akutagawa Taketo that has just entered as a freshman at Hirameki Academy. Unlike regular high schools, this school only accepts those who are accomplished or geniuses in their particular field, ranging from authors like Taketo to mathematicians or musicians. Taketo feels comfortable being in the presence of other brilliant minds but is afraid that his talent might project as him being perverted. Is Taketo going to be able to keep his secret?