In the Gakuen Heaven (HIGURI You) series:

V.1 - Gakuen Heaven
V.2 - Nakajima Hen (Closer to You)
V.3 - Tanba Hen
V.4 - Endou Hen - Calling You
V.5 - Shichijou Hen - Sweet Sweet Darling!

From Midnight Scans: Even though Komachi was born into a doctor's family, she's extremely shy, has a phobia of blood and is extremely bad in sports. Studying is the only thing that she can do well, but she totally failed her high school entrance test! Instead of entering her first choice "ELITE class," she entered the "SPECIALITY class," where people who want to specialize in sports and the arts are. Macho with dreadlocks, bearded lolita... Being surrounded by these people is already very terrible! But on top of that, the famously talented sprinter, Oosaki Hiro, has zeroed in on her and has his eye on her...

Severely allergic to felines, Yuuto Amakawa spends his mornings nursing a drippy nose courtesy of his friend Rinko’s cat. But on his sixteenth birthday, it’s not just Rinko’s pet that’s riling up his allergies (to say nothing of his hormones)! Appearing before him is Himari, a buxom, sword-wielding cat spirit in human guise, who has sworn to protect Yuuto, now the target of vengeful spirits! It’s clear that Yuuto’s allergies are the least of his problems — he’s gonna need Himari’s help if he wants to live to see his seventeenth birthday!
(Source: Yen Press)

From RebelliousArt:
Minato is a clumsy high school girl. When she went to the infirmary to lie down, she found a naked guy, and he kissed her!
The guy is Chihiro, a tenth grader who is one year younger than she is. Minato is very interested in him, but he already has a girlfriend. Minato plans to give up, but...?

*Includes several short stories:
• Amai Yokubou (Sweet Desire) in volume 5:
After being dumped, Maya is accused by men as being cold and frigid. An encounter with a stranger leaves her thinking differently, but somehow this stranger knows her name.

• Only One in volume 6
• Fake Lover in volume 7

From Delish Scans:

My dream of a fairy tale kiss, dashed.

Summary from Sumie: Unable to bring himself to touch the girl he loves, a boy spends each day with her in agony and joy. He is too afraid to exchange the comforts of friendship for something much more— something possibly much stronger, yet more fragile. Subconsciously, he tries to distance himself, but will that destroy the one thing he wishes to protect?

In a Tokyo of the not-too-distant future a young girl looks up to the stars with melancholy in her heart and hope in her eyes. Thirteen-year-old Asumi Kamogawa’s life has been tied to those stars; her future may very well be among them and she is not alone. Asumi is one of many young people with ambitions to some day head off to space for Japan’s first manned mission.
Before liftoff, like any true astronaut she must show the right stuff and overcome odds to pass numerous physical and mental trials if she even wants to be considered in the running for a rare spot in the elite Tokyo Space School.

From Village Idiot: To Minagawa Ichiri, both good things and bad things are bothersome. That's why his principle is to avoid doing anything that would cause such a thing. However, there is one thing that he can't avoid - because of his parents' jobs, he was constantly transferring from school to school. This time, he has transferred to Reimei Academy, one of the five famous private academies called the "Seven Sisters." On his tour of the school with vice president Kirishima Shitone, an attack occurs! The attacker seems to go after people with long black hair and a sword in an attempt to find and exact revenge on "Double Edge," who killed one of her best friends using a power called "Idea," where she brings her principles into reality using a wrist band called "Codec."

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?