Talk about being at the wrong place at the wrong time! High school student Kazuki Muto had no clue what he was in for when he rescued damsel in distress Tokiko from a monster known as a "homunculus." Disguised as humans—who actually eat humans—homunculi are malevolent creatures that affix themselves to people's brains, and once fully grown, the only thing that can annihilate them is a weapon called Buso Renkin!.
Follow the adventures of Kazuki after he discovers that it was actually Tokiko who saved his life by implanting a kakugane—an alchemical device that transforms into a busou renkin—to replace his heart.

Note: Volume 10 includes the pilot story Embalming —Corpse and Bride— along with liner notes for both it and Busou Renkin.

A series of unrelated short stories about sisters with brother complexes (and in some cases, the brothers also have sister complexes).

When his family dojo is forcibly taken by Yakuza due to his debt Yachiyomaru with his bodyguard Burai An stand against them in order to retrieve it! Before they know it, in prevailing over trials one after another, a deep affection is born between them...!

Chris Watanabe is a high-school teacher. When his father remarries, he finds himself with an English step-brother named Wataru. Wataru transfers to Chris' school, and just as the four of them are starting their new life together, their parents die in a plane crash. Now Chris and Wataru are living alone together. The elder is cute and the younger cool; what will their new life hold for them!?

Two brothers, Shunpei and Kyouhei, have very opposite characters but share a crush on their cute sister Anko. The three of them live with their excentric father, may (or may not) have diffferent mothers, have fun, lots of tantrums and try to lead a happy life in junior high school.

From Omanga:

Eiji Otsuka and Sho-u Tajima at it again, Eiji in a much more minor role this time, however. In any case, this a relatively older and short comedy series (4 volumes) that should be a fun break from their usual mayhem with MPD (Multiple Personality/Dissociative Identity Disorder) .

In 1994, this manga was published as a whole under title "BROTHERS High School".

Kondo Masahito is a tough high school senior, while his older brother Yoshio is a calm and gentle kindergarten teacher, so it is not rare that younger brother protects the older one. Different personalities make it difficult for Masahito to understand his brother, but he still tries.

Chapters 5-9 are oneshots:
5) Ghost --Setagaya-ku no Maboroshi--
6) Amai Natsu no Kyousoukyoku
7) Unbalanced・Tart
8) Kimi wa Nemuru
9) DEAR / Ganbare! Kagaku-bu

The story of Ciguatera follows Ogino, who is bullied in high school along with his friend Takai. The two rely on their passion towards motorcycles and desire to get one to add some hope and vigor to their otherwise bleak lives. The two are learning to drive in secret at a driving school, and it is there that Ogino's life begins to change forever. The manga follows a variety of characters through their high school and working lives, through their struggles, their triumphs, their dreams, their futures, their love, life and loss.

From Boys On Boys Love:

Katou is a member of the high school swim club. Matsuoka has come to bring him lunch and use Katou as his stress relief punching bag yet again. To the sympathy of his club mates, impulsive Katou totally falls for him, saying with a shy smile that Matsuoka is cute… Even as Katou treats Matsuoka kindly and tells him that he loves him, Matsuoka remains a total tsundere, leaving doubts to linger in his heart!

From ADV:
America in the Roaring 20s. On the surface, it's a positive, peaceful time after the violence of the Great War. But lurking in the shadows is a dark element ready to snatch that peace away. Sister Rosette Christopher, an exorcist working as a part of the Magdala Order, has a duty to fight the demons which appear and cause destruction.
But along with her companion Chrno, she usually ends up causing more destruction than the demons themselves! On one particular mission, they meet a young girl with a beautiful voice named Azmaria, who is being targeted by her own stepfather. As Rosette and Chrno work to save her, more is revealed about the relationship between them. There is more to these two than meets the eye.

1. Chronic Love - Reminiscence
After the sudden loss of his father, Duke Alphonse Varney took over the affairs of his estate, which necessitated putting his mansion on the market to repay his sizeable debts. One of Alphonse’s classmates from his boarding school days, businessman Richard Turner, announced that he was interested in buying the mansion. Richard had reason to dislike Alphonse, which made Alphonse all the more unable to hide his opposition to Richard’s unexpected proposal, but in reality, there were hidden feelings between the two. This is a classical love romance collection set in polite English society. From Boys On Boys Love

2. Flirtatious Love
Francis Norman is used to seeing his employer (and rampant playboy), Lawrence Wilson, playing around with women during work; however, that does not stop the longing he feels for his boss. Lawrence tells Francis he wishes for true love, which only makes it harder for the poor assistant. Lawrence only goes for beautiful people, and the bookish Franc doesn't fit that description at all... but what about when he removes his glasses? "For feelings do not always go how we plan."

3. Midnight Secret
Ed was filled with adoration for his older brother's* friend, Oscar. Was it respect, or love? When Oscar became ill and died, Ed decided to become a doctor, fulfilling Oscar's dream. However, there is one problem: Oscar's younger brother Ryan. Ryan plays around all day and night, and Ed can't help but be bothered. When the night falls, these roommates become...
*Ed's older brother is Richard, from chapter 1

4. Cute Little Liar
After Andrew Winston stops to help a beautiful lady who looks ill, he realizes that she picked his pocket and stole his grandfather's stopwatch. He is determined to find her... not for revenge, but to help her instead since she must have had a good reason for doing that. In his search for the pretty woman, he discovers something much better - an equally beautiful boy, Ian Butler.

5. Direction of Light
Stephen, who has appeared in all the chapters so far, finally has his own story!
Time has not moved for Stephen since his lover, Oscar, dumped him and died soon after. Playing with women, dining on fine food and drinking expensive wine are how he spends his time... until his brother introduces a young artist who wants Stephen to be his model. Stephen's brother doesn't leave him much choice, so Stephen finds himself becoming quite fond of Elias Reed, and even looking forward to his visits. Stephen suddenly realized that he has fallen in love with Elias, only to hear that the beautiful artist was in an accident! Is history repeating itself?

6. Lover's Feast
An extra with all of the couples* attending a party hosted by Stephen. The ukes get some pointers from Alphonse...
*The only couple not present is Ed x Ryan... I wonder why lol. Maybe because they're in school? Pity...

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.