From Karma Falls Scanslations:

Because of a frightening experience three years ago, the boy Sata Senda became a compulsive cleanliness freak. As he has anti-bacterial spray and mask as standard equipment and doesn’t allow any form of close contact, he has no friends… Thus came the summer of sixth grade. Sata, who has been half forced to participate in the school trip, arrives to the meeting place completely wrapped in a protective suit?!

From Transcendence:
High school student Asahi is forced to provide blood to a childlike vampire Hikato, and becomes his "temporary" mother, until he reverts to his original self. When Asahi finds out that Hikato stayed behind to protect the human world, how will her thoughts towards him change….!?

From Taruby:

Our protagonist, Moji Shimeta, just so happens to fulfill the stereotype for being a worthless human. His inability to carry out a conversation has left him at the bottom of the barrel as far as friends are concerned.
That Shimeta fell in love with the school idol Ishikawa Yuuko, however that kind of love is absolutely, perfectly, and completely impossible. During this time, the messenger of the gods, Osaki, appeared to grant Moji's request with a price attached concerning Moji's cooperation in catching some runaway evil spirits. However to catch them all, Osaki uses Moji as a vessel to become a servent of Uganomitamanokami (aka Inari) called Youko. Lots of Ecchi situations and humiliation abound at Moji's expense.

Ohisama Egao collects the stories of the budding romances of three schoolgirls and one teacher - Aoi, Ryouko, Shizu, and Awada-Sensei - and also shows how their lives intersect at school, a small cafe, and elsewhere. Things don't always go smoothly with the schoolboys they like, but like the sunflowers that surround them, the girls keep looking for the sun.

- polm23

The son of a famous pianist, music student Shinichi Chiaki dreams of studying abroad and becoming a conductor like his mentor. Unfortunately, his fear of flying grounds his lofty plans! As he watches other classmates achieve what he has always wanted, Shinichi wonders if he should quit music altogether.
Then one day he meets fellow student Megumi Noda, also known as Nodame. This oddball girl cannot cook, clean, or even read a music score, but she can play the piano in incomparable Cantabile style. And she teaches Chiaki something that he has forgotten: to enjoy his music, no matter where he is.

Winner of the Kodansha Manga Award for Shoujo in 2004.

This is a story about 2 childhood friends, Masato and Yuki, that reunite as teenagers. Masato is surprised to find that Yuki has become so cute, but even more surprised to realize that Yuki was, and still is, a guy. Yuki's affection for cross-dressing leaves Masato with feelings of discomfort and fright.

On the last day of school, Mihane confesses to her senpai the long-term admiration she's had for her ever since they met, as well as tells her that she will try her best to enter Niji no Oka Girls' Academy next year, the school to which her Senpai is going to attend. Now, one year later, she's managed to pass the entrance exam to the prestigious school and is taking the bus to the school. Unfortunately, she takes the wrong bus, but encounters an interesting first-year girl, like her, that is also set to attend Niji no Oka Academy.

Yoshino Nako has a saying. "If I'm happy, I can do anything!"

In her sister's place, Nako-chan steals the groom of an arranged (political) marriage and helps them elope. But when the Hayami group starts failing, she must pay the consequence by housing the delinquent brother...

From Perfect Illusions:

Reo-chan, a first-year girl, gets dumped by her boyfriend because she's not skilled in the home economic traits he believes women should have. Her ex tells her that she must apply to a "housework" club before he will reconsider going out with her. Therefore Reo-chan has little choice but to join.

Here's the catch: the only members are four gorgeous bishies. The other first year in the club, Irinaka, competes with her a lot. As the story progresses Reo and Irinaka get forced into a lot of interesting situations together and in the meantime become closer and closer.

Being beautiful is never easy, especially if you're an eighteen year old boy like Yoon Da In who is constantly mistaken for a girl because of his delicate good looks. Da In is, in fact, anything but delicate. He is the ringleader of a group of tough kids in an all boy's school, and he's quick to beat the living daylights out of anyone who even hints that he resembles a girl. If that wasn't hard enough for a regular teenage guy to cope with, his life is about to take a shocking turn for the worse. When Da In stumbles upon strange happenings in the forest, he gets sucked into a world of vampire intrigue and sinister romance that he never knew existed. And he learns that there are worse things than being turned into a vampire: being turned into a girl?!

1) Tell Me More
Thanks to being of mixed race, with the bold facial features and nice body, you can say I'm popular with the opposite sex. However, guys don't seem to like my personality…that's why when I reveal my inner self, people might say “Your character is so different!” Lately, I've been chasing after Tsuchiya, but he seems to be like all the other guys…?

2) Look Cooler
I'm popular and every guy wants me because I'm cool, yet I'm going out with Tsuchiya, who is far from cool. I wonder what got me to go out with him in the first place? Suddenly he gradually became a little bit cooler....I think.

3) I Want To Go More
Recently Tsuchiya has been acting weird. He started to become cooler after his hair grew longer. Also, he stopped walking home together with me. No matter how much of an idiot he is, I love him.

4) Cherry Girl
My cousin Arata, came back from the U.S. He was tiny, slow and a crybaby. But now he totally changed. He greeted me with a kiss!? And the worst thing is, it was my first kiss!

5) Say I'm Cute
Just Because I'm in the Judo Club doesn't mean that I'm not girly. But Kazuki is the only person who thinks of me as a girl. I started to fall in love but he was already in love with another person, because of a delicious cake he ate, that was made by her. But the only thing he doesn't know, is that the cake was actually made by me.

Momoko is a girl who was born into a witch family in which most of its female members possess magics. Yet they can only reveal their magical capability to "the one" i.e. their soul mate/spouse. The more magic she uses in front of strangers, the more parts of her body would become cat-ish (such as cat ears and whiskers), and if any stranger learns her true identity she would turn into a cat completely--like her mother!

Having joined the magic club in her school, Momoko has used her ability too often that her cat ears pop out every once in a while so she must find "the one" as soon as possible, but her candidates have already become suspicious...

Matsuri Ichimatsu, Haruno Koume, and Sanguubashi Takezou are old friends with one thing in common: despite their good looks, they're incredibly unpopular with the ladies. But what does Polaris have to do with their fate? And will they ever get that harem they've always wanted?

It's the start of high school, and Kako decides to "produce" her bookworm of a childhood friend, Kousei, so that he can become a good-looking and popular school idol. She models him after Lawrence, a character in a manga she likes, but as Kousei's transformation becomes a huge success and he extends his new character beyond what she asks for, what will Kako do? Will she find herself left behind in the wake of his newly found popularity?

---

Also included is a story called Megane Danshi Shinka Setsu (Theory of Evolution for guys with Glasses) in volume four.

Twenty-nine-year old Kurose Kazumi is a programmer in an eroge company and has played plenty of galges when he was younger, but he's completely uninterested in young girls. A chance encounter changes that when a confused middle schooler approaches him due to a misunderstanding, but he realizes how sweet she is and wants to keep meeting her.

Oto Tachibana, a 17-year-old, good-natured and caring girl, decides to earn her own school fees from now on, so she takes a job at her new school as a dormitory maid for "Class Z," an elitist class full of people with special talents. As such, she starts her new life away from her family in the dormitory, surrounded by (mainly) boys that are all a little different. Among them is Jin, the dormitory head, a boy who is amazingly strong and who keeps a "cuddly" pet at the dormitory's swimming pool - a pet shark! The quite charming and funny story revolves around the daily lives of the people in the dormitory, and in the middle is the relationship that Oto and Jin are starting to build.

From StarryHeaven:

Best friends Tokieda Airi and Sahara Taki have had a happy junior high school life, but the mysterious group “F” begins to target them because they attract too much attention! “F” has already hurt many attention-grabbing students, and they begin their attacks on Airi and Taki by trying to split the best friends apart. When this method doesn’t work, they sink even lower: they target Airi’s sister Nako! Airi and Taki’s beautiful school life has been ruined, and now they must race to reveal the culprits of “F”…

From Nagareboshi Manga:
There's a new pet that has been found! It's called a baby, and Asahina Tamae is the only one in her class that doesn't have one. She finds three babies one day that seem to be special. They can do things that other babies can't! But before Tamae can keep them--she has to prove herself to her mother. Out of all her siblings, she gets the worst test scores, and the last thing she needs is another distraction.

One night in the Windbloom Kingdom, Princess Mashiro Blan de Windbloom is assassinated in her sleep. Some days later, the main character, an anonymous boy, arrives in Wind City, capital of Windbloom. Using a gem passed down from his mother, he takes up the identity of Mashiro and joins Garderobe. The story follows his experiences in Garderobe and later his battles against those who would seek to destabilise the peace.

From StarryHeaven:

Ch 1-3 Renai Kyoushuujo
Ran is terrible at love and is always getting rejected. Today’s rejection was witnessed by the most popular prince at school, Takashina-kun! Ran thought she came off as an idiot, but with Takashina supporting her efforts, Ran falls for him! That night Ran left for home late and in a seemingly empty classroom, she encountered a mysterious man in a military uniform. Did Ran discover the love training institute?

Ch 4 Unfinished Love Song

Ch 5 Forgotten Things