From Viz:

Choko Kuze is the sensible daughter of a venerable family who went bankrupt. She joins a real estate company as an entry-level office worker, but her eccentric boss is harder on her than anyone else in the company! After hearing him inadvertently call her "milady," she realizes he was the young servant boy she knew as a child. At work he's a tyrant, but after hours he insists on treating her like a lady of the nobility. Is romance even possible for a couple locked in such a crazy role reversal?

Mizuhashi Nao is a 16 year old, who is shy and friendless. He passes his class breaks in the toilet playing games where he won't be bothered. One day an upperclassman appears peaking from above and with a huge nosebleed that covers him with blood. Her name is Serika. Wait, a girl?! What is a girl doing in the boys restroom? And why did she just ask him out on a date? Nao's world is about to be turned upside down.

As a child, Kawagoe Haruma eagerly awaited the birth of his little sister. However, his mother had a miscarriage, followed by an operation that left her barren. That Christmas, Haruma made his Christmas wish. It was a wish so innocent and heartfelt that it was accepted instantly, unbeknownst to him.

Many years later, on Christmas morning, college student Haruma is awoken by a woman riding a hovering motorcycle and claiming to be Santa Claus. She throws him a bag, and he opens it to find his new little sister!

Complaining to Santa Claus that he made this wish a long time ago, she tells him that it takes much longer for a sister than it does a toy car. After naming her Choko because of the Anchoko (mini-guidebook) she carries around, they begin their new life as brother and sister in a crazy apartment building filled with interesting neighbors.

Sakurai Sayuki was born with sharp eyes that make her look like she's always angry, even though she's not. Because of her looks, students around her misunderstand her as a bully and scary girl when in fact she's "a romantic". After 15 years without a boyfriend, she started off her high school year with hopes of love...

Also includes:
Yes or Kiss (Volume 2)
One night, Miyu was confessed and kissed by her friend, Ai's, boyfriend.

Ryouko has fallen in love with the radio DJ Choco. Upon sending him a cake for Christmas she finds herself as a substitute in the radio show. Will she be able to get closer to Choco? But then there is also her annoying school mate, Keiki...

Includes short story: Wink Rain.

Keiko is a junior 2nd year student, but has no experience in love. One day, while going to school, she helps an unconscious 'cute boy' who fainted from anemia. Being two-faced, he doesn’t thank Keiko but instead calls her an old lady. Surprising as it is, that boy goes to her school and is a first year.

Also includes 2 oneshots: Never Let Go of Your Hand and Sweet Relationship.

A terrible creature has been plaguing the community: a man with a fishbowl for a head. When he attacks someone, the goldfish leaps out of his bowl and drinks their blood. The victim is irreversibly transformed into a goldfish! This terrible crime has happened to high-schooler Kousuke's little sister. With no other option, he takes care of his goldfish-sister as best he can.

One day, he comes across a strange girl named Ringo, who wears a school swimsuit, carries an umbrella, and keeps a gun hanging around her neck. Ringo is an apprentice blood diver, and the gun is her way of shooting herself into the wounds of the fishbowl man's victims. If she can get to them in time, she can prevent them from turning into goldfish. Ringo's mentor, Ichigo, says that she's heard of a way to turn people back from goldfish into humans. Kousuke is determined to help Ringo find a way to help his sister and the loved ones of his friends at school who have met the same fishy fate! [tethysdust]

Note: The magazine this manga was serialised in was cancelled, but the series received a continuation in Comic Earth Star.

15 years ago, the newborn Ukai Nanoha and her mother were involved in a plane crash. The mother was killed and the child alone, among all of the passengers, survived. This survival was brought about thanks to the Great Demon Maou, who replaced her unbeating heart with one of his own, allowing her to live on.

Now, however, Maou has appeared once again and attempts to force her to return his heart. In the end, Nanoha goes to live in Mezon Aasu (Earth Mansion) which exists solely for the use of magical beings, and for now at least, retains possession of the Great Demon Maou's heart... but how will she be able to handle being manager of Earth Mansion, the place in which Maou himself makes his residence?

1) Chiko's Wish
Chiko is a young female sparrow in love with a human boy named Shuu. One day, the Grim Reaper suddenly shows up at Shuu's house and shocks Chiko by announcing that he's come to collect Shuu's soul. What can one little sparrow do to save a human life...?

2) Crybaby Yukimushi

3) Reverse Storm Warning

4) The Rainbow's Fugue

5) Spring Game

6) A Half-Bitter Present

1-2) Chikan Diary
Yuuto is a first year student at an exclusive private school for boys where everyone is a virgin except for the new transfer student Hachiouji. As part of the student news paper it's Yuuto's job to get all the dirty details or else spend the rest of his life as a virgin!

3) Journey of Lost Love
When his lover gets married heartbroken Atsushi decides to take a tropical vacation to relieve his stress. Nothing seems to be working until pushy tour guide Rubi decides to help Atsushi out. But the only thing Rubi seems interested in seeing is Atsushi's body!

4) The Perverted Daddy Long-Legs
Orphan Mizuki is suddenly pulled off his paper route and offered a high paying job taking care of a sick company President. Mizuki's new duties for entertaining the bed-ridden, surprisingly handsome young man aren't quite what he anticipated...

5) An Awkward Kiss
Morihira has issues moving on to the next level of intimacy with his lover Ueda because of a complex with his face, but Ueda mistakes it as Morihira not liking him. Will this pair ever move to the next level?!

6) I Won't Even Lose to Sailor Suits
Shintarou's teacher/boyfriend went to work at an all girls school and suddenly told Shintarou not to see him anymore. What is poor Shintarou to do?! Putting on a girl's uniform seems like a good start.

From Day of the River:

Since her parents are a little bit slow, Matsuda Erika (or Eri for short) has taught herself to be independent and extremely reliable. Moreover, she devotes herself to taking care of those around her—even if some of her classmates find her behaviour overbearing and annoying. One day, a strange new transfer student is introduced to her class. This boy speaks in choppy sentences, has little to no facial expressions, and goes by the name Nokina Kaname. Instantly, Eri feels compelled to take care of this martian-like new boy in her class.

This manga is a revised version of "Kimi to Hatsukoi", a one-shot found in Mako to Aki-chan no Koigokoro.

The oneshot "Kirai, Suki?" included at the end of the story has yet to be translated.

A playboy who has gone through countless girls; a pure, lovely girl whose only love is chicken cutlets; a super gifted student who spouts poetry and songs about fried chicken cutlets; a blond hyperactive boy who chases after girls with chicken cutlet deliveries three times a day; the student council president Wei Luo Li who moves people's hearts everywhere, and also the truth of the BL headline story published in the school newspaper...
The legendary stories happening at Rembrandt High School are just that unbelievable!
Includes side story to "Proud Dragon Showy Phoenix", which was published in Butterfly Likes to Read

Karin is a cute little girl who also happens to be a vampire... with a twist. Once a month, she experiences intense bleeding from her nose-we're talking gushers! In other words, she's a vamp with blood to spare, so rather than stealing blood from humans she actually gives her blood to them. If done right, this can be an extremely positive experience that benefits the "victim" as much as the vampire. The problem is that Karin never seems to do things right!

Tomoki, a young man with a thing for ecchi stuff, is used to living alone, with his dad traveling all the time. However, he is not prepared for the sudden arrival of his 9-year-old twin sisters, whom he never knew even existed! Toujou Minaho, the big-breasted girl next door, is ready to help out, but these cute little girls are quite a handful.... From Baka-Updates: Kamishiro Tomoki is an Otaku who is studying for college. One day, he received an outrageous "package" from his father: 9 year old blond girls who are his dad's illegitimate children from one of his business trips...... The twins, Selly and Riru are completely spoiled and drives Tomoki crazy. Not only that, the sisters have a "secret" plan to kick out Tomoki and claim the house just for themselves. Will Tomoki manage to make peace with the girls? Read and find out!

From Attractive Fascinante:

Kotani found his pace all messed up when the new biology teacher, Fujishima Masato, appeared. Fujishima confessed and Kotani felt scared. Fujishima’s perseverance won and Kotani accepted him. Kotani’s ex-student came back and behaved oddly towards Kotani. When Fujishima couldn’t find both of them, he thought Kotani might have been kidnapped. Was he able to save Kotani in time?

Contains one main story and two one-shots.

The heroine is a girl who has no clue about romance.

Her point of view :
My childhood friend is a cute guy, and he always come to my house in the morning to wake me up. Although he can be quite mean sometimes, being with him makes me feel very happy. But, once the fact that we're not dating became known, many girls began to hit on him, and start to confess. But, it seems that I feel something towards him lately! Whatever should I do now?

Extra 1 : The Witch's Sweetheart
Extra 2 : Victory or Defeat : The Unbeaten Love

Cherry Juice is about Otome and Minami, two step-siblings. Minami is a popular boy who takes cooking at school, and Otome is an average girl who is in love with Minami's best friend. Cherry Juice's main focus is on the love lives of Minami and Otome, who are in love with other people....or are they?

From Forbidden Garden:
Manami, a highschool girl, joined the class party where there was fun, laughter, and drinking. She had the best night of her life until the next morning, when she woke up to find that she wasn't alone. She quickly looks over to see that lying next to her is her "friend" Motoyoshi Hajime. Did they actually do anything together?!! To the inexperienced Manami, her world is turned up-side down as she tries to figure out how to deal with this situation...

Includes:

1. Cherries Fight
2. The Fastidious Princess and the "Mature" Prince
3. Miss Pageant's Anego. Kakei Masumi ran an all-girl gang in middle school. Now in high-school she tries to bury her past, pose as a bookish honor student--and keep a tight leash on her temper. All this is at risk when Ohara-kun picks her to compete in the school pageant. Why her?
4. Secret Incompetent Swordman

From Tokyopop:

Naka is an aspiring young model with a problem: her face tenses up into a terrifying spectacle whenever she gets nervous on photo shoots! Naka's rival is Umi, the hottest model at their agency. But Naka soon discovers Umi's secret--and hilarity ensues behind the cameras!

From Aerandria Scans:

Young master Hewlett is a famous work-a-holic watch-maker whose one dream is to make watches only for people who appreciate and love them. And exactly when he thought he’d never meet such a person, his faithful butler Jill made him attend a tea-party where he met the new maid Mulara. And her first words were that her greatest treasure ever is one of master Hewlett’s old watches...