A planet-threatening space disease, the "demon flu", has infected an inhabitant of Earth, and a space doctor is needed! The Space Medical Bureau has chosen Dr. Rurru for the job, but -- unfortunately for Minao Hitoharu, the infected patient -- she has a tendency to mishear and misspeak (with a mind towards ecchi) to comical effect.

Jr. high student Izumiya is surprised by a sudden kiss from his handsome classmate Hayakawa. Leaving him completely confused, Hayakawa suddenly leaves town, but the two reunite again in high school. As the two continue to part and reunite, Izumiya's feelings start to stir...

From SCX-Scans:

It tells the story of a couple, both very innocent and in love with each other, who are now living together! Takeshi is a pure-hearted college student who is enticed by his girlfriend that has run away to live with him. Temptations ensue.

A manhua based on the Taiwanese drama of the same name:

A really unfashionable working class girl, Chen Xin Yi, desires to tie down her handsome boyfriend to be with her. Due to certain reasons, her boyfriend gets her to go on a love cruise and she started to ponder how to lose her virginity and tie down her boyfriend. Xin Yi ended up taking cold medicine which made her drowsy and caused her to go into Ji Cun Xi's room. Cun Xi is the sole male heir to his family's company and has been in love with his girlfriend, Anna, for a long time. He planned to propose to Anna on the boat, but she didn't turn up. An island owner added drugs into Cun Xi's drink, and Cun Xi became disoriented and returned to his room. Xin Yi and Cun Xi end up having a one night stand. Xin Yi later finds out that she's pregnant, and Cun Xi's grandmother forces them to get married. Will a couple forced to marry for the sake of their unborn child find love with each other?

From Fantasyshrine:

Youhei immediately fell in love with the actor on the late night advertisement, Satomi. After going through some random events, they became lovers. However, how will these two love birds face the upcoming events which involves costumes, a manager, a stalker and maybe an old crush!?

Just before entering the university, Yanagiba Masahiko's father died in a car accident. His mother died when he was four, which makes him now really an orphan. But even before the death of his father, he didn't have a family life, as his father was always busy or abroad.

When his mother's younger brother and his wife decide to invite him to live with their family, his life takes a turn. But it is not going to be the normal family life he is imagining for himself. What is the "terrible" secret that led his parents to break the bonds with his aunt and uncle? What could be the true nature of his cousin, Shion? And last but not least, will this "terrible" secret eventually get Yanagiba, too?

Sweet and pretty high school student Keita is aggressively courting his remedial class teacher, Soga. Soga, however, thinks it's just a childish joke, and that there is no real love... From the beginning of courtship between sensei and student to their first time together, and other romantic stories! In another pairing, an ex-student meets his tutor. Adult love relationships are compiled here. Pure love and romantic love stories of innocent teens and adults who are toyed with by them.

From ShoujoMagic:
Yuki and Emiri are staff at Syrup Cleaning Service, but they actually only have one true goal... and that is to find their long-lost boyfriend, Akira. Also includes the 100p story, "We Are Also In Arcadia," where Ryunosuke from "Baby Pop" plays a role.

Anji is the complete opposite of her beautiful, smart and ambitious older sister Anri. To make matters worse, Anji has a hopeless crush on Anri's boyfriend Baek-hui, who is her sister's match in looks, brains, manners and goals. But is Baek-hui all that he seems? From Baka-Updates: Anri and Anji are sisters. Anri is one year older than Anji. Anri is a person with determination and guts, not to mention top grades and attitude. Anji has really nothing to offer. She can be quite mean and unreasonable. But, when it comes down to her sibling, she can be pretty determined. This story details the troubles that Anji goes through because of Anri's two-faced boyfriend, Baek-Hui Kang.

Onizaki Teppei is a high-school freshman who just wants to live a plain student life, but his world is rudely shaken by a mysterious girl, Mitogawa Enma, who declares her intent to find a husband at the school!

When Miyagi, the head of a well-established Japanese restaurant, is confessed to by Kasuga, a chef-in-training visiting from a sister restaurant, the next day and every day after invites continuous sexual advances! Even as he struggles to resist Kasuga's proposals, what will happen as Miyagi becomes moved by Kasuga's unwavering attempts?!

Verde, a powerful and secret organization that controls the world, has a new leader. The only thing that stands in its way is an unlikely character, Kujou Shin, the king of pessimists. He has no attachments to anything or anyone and feels no hesitation to dying. He is unwillingly dragged into a fight for the most powerful position in the world, the leader of Verde. What will his fate be?

A collection of oneshots.

Main story: Love Progression of an Honours Student.

Yukio is a cold girl with a poker face, not to mention cute. She works like the president of student council with the two most popular guys on school. But under all that seriousness, her throbbing heart is desperate to be loved by someone.

Even so, why cant she tell him?

+ Love Progression of an Honour Student extra
- Short Story 1
- Short Story 2

From Tokyopop:
Coud is a young sky pirate who discovered a girl with mysterious powers on what had seemed like a routine mission. Ren has the ability to lend Coud bizarre fighting capabilities (his arm turns into a giant blade of some sort), being part of a race of beings called Edel Reid, but being the possessor of a stone called the Elemental Gelade, she has powers even beyond the norm.

From Wingtip Cafe:

Hina, Arare, and Hana are the three sisters of Kyoto’s oldest confectionery shop, Fukuya. Although they each have different personalities, they all take pride in their shop. Fukuyadou-honpo will bring you a taste of the ancient capital, Kyoto, with a shrewd mother, sharp-tongued grandpa, and a host of other characters who bring life to the great city.

Contains 6 short stories:

1. Fu Jun Ai
One day, Onosaka Kumiko returns home from grocery shopping and finds a stranger waiting for her in front of her house. The stranger turns out to be Shinohara Yuki, an old crush and work colleague of Kumiko's who quit 3 years earlier because of an incurable illness, and all he wants is to confess to Kumiko before he dies. Knowing that he'll die soon, Kumiko takes pity on Shinohara, invites him to live with her, and soon becomes his lover. But are her feelings really only pity? And is there something Shinohara's hiding too...?

2. A sin to love you
Yuu is the top hostess at an escort club for a reason: she loves getting her guy—but she loves being in control even more! So when shy and conservative Mochizuki becomes her newest client, his reserved behavior perplexes her. Every night she pulls out her best feminine wiles, so why isn't he falling for her already? In desperation, she drags the hapless "Shin-kun" to a love hotel, where she discovers a very interesting secret about him. Could it be that the tables have turned and now Yuu is the one in danger of falling for Shin-kun? And is that the only secret of the man of her dreams?

3. Can't live without you
A follow-up to "A sin to love you".
*NOTE: A follow-up to this can be found as an extra in the series Private Prince.

4. The Deceitful Fingers
When homeroom teacher Miyagi's assistant goes on maternity leave, her replacement is the handsome Kiritani Riku. For Miyagi, it's attraction at first sight, but Kiritani seems stuck on an unrequited love—a former teacher of his and the reason why he came a teacher himself. Crushed, Miyagi gets drunk at a welcome party for Kiritani and passes out in front of everyone, but she wakes up to a most unexpected companion...and an even more unexpected proposition!

5. Can I love you dearly?
Nishizawa's supervisor Nagase is a devil! His handsome facade can't hide his critical and exacting management style. Then she discover's his secret- he's a fanatical pet owner that loves his cat.
The softer side of Nagase is proving devastating to Nishizawa's vision of her boss!

6. How Shinohara-san spends his weekend (bonus story)

Tohru Honda, an orphaned high-school girl, is taken in by the wealthy Shigure Sohma when he realizes she has nowhere else to go. However, the Sohma family shares a secret, and it isn't long before Tohru discovers that there's a reason why her classmates, Yuki and Kyo Sohma, never let girls get near them, and never talk about their lives before they lived with Shigure. And before she knows it, Tohru has become so tangled up in the lives of each member of the Sohma family that she couldn't leave even if she wanted to.

As she learns more and more about the truth of the Sohma family and the nature of their secrets, she desperately searches for a way that she can save them. But what can one girl do, especially when it seems that she may have been part of someone's plan all along . . .

Fruits Basket received the 2001 Kodansha Manga Award in the shoujo manga category and the "Best Manga" award at the 2007 American Anime Awards.

From ryColaa:
Our hero, who doesn't know how to swim, joins his school swimming club and begins to learn from their star swimmer who loves swimming more than anything. Good thing she's cute and nice to boot!

1-2) Yamada runs away from home and goes to hang out at the school until things cool down. Unfortunately he runs into his homeroom teacher who takes him home.

3-5) Ikeda moves into his dormitory to find out his room mate Kazuma has a terrible personality.

The extra is about the first story.

Fortune Arterial's story revolves around the male protagonist Kohei Hasekura, who transfers into a prestigious public school--an English style six-year school, serving junior high and high school students. The school, named Shuchikan Academy, is on an island, Tamatsu Island, off-shore from mainland Japan, and the only way to get there is by boat. This is a series of characters' introductions to prelude the main story.