from hazukashiikedo.wordpress:

Bikkuri suru hodo Doji na Koi
Nao and Tom have been friends since childhood, Nao being the caretaker and Tom being the clumsy airhead. Their high school lives have been fairly uneventful - that is, until Tom suddenly confesses to Nao one night. Nao points out the obvious: “But we’re both boys…?”

Bitansan Danshi
The second story deals with two college students who’re doing a room share. Shimizu Mikio is in his second year of college, and has started rooming with the fluffy, energetic Sawamura Souta. But the more they’re together, the more Miki starts to notice something: Souta seems to like him.

1-3) Bijin Kakumei
During sixth grade Yuki made a love confession to Shin, an extremely beautiful boy. She was extremely shocked when he started teasing her and called her fat and ugly!!
Three years later, Yuki has become beautiful by putting in great effort everyday because she wanted to get back at Shin. She transformed into a very beautiful girl!
She was accepted into the same high school as him to plot her revenge, but her childhood friend Migiwa who knows everything about Yuki's past is attending the same high school!?

4) Gothic Boyfriend (ゴシック彼氏)
Narusaki-Senpai is a famous and widely sold horror novelist, while Himeno loves to write childrens' love stories. She expresses her opinion on her Senpai's writing, but right as she says so, she knocks right into him! Narusaki takes offense to her opinion, and kidnaps her from her sanctuary of cute to his dungeon of horror!

5) Tough Girl's First Love (暴れん坊少女 First Love)
Izumi is considered the "Deity of Girls" (or protector) in her school, but there are sometimes limitations to what one person can do by herself. Kaidou-Senpai steps in, causing her to develop a crush over him.

Kitazato Fubuki is always overlooked by his family members; overshadowed by his more talented and famous brothers. He tries to draw attention to himself and usually spends his days fighting, but one day he manages a quadruple and a half jump at the skating rink. Thanks to this remarkable feat, he is showered with attention for the first time in his life...

Collection of oneshots:

6. Hibi Kirakira
It’s summer holidays for Tomoaki and he is helping out at the daily morning exercise for kids. But recently, he notices that a young man living beside the park has been looking at the exercise group every morning. Is the young man a Lolicon that is targeting his kids, or is it entirely something else?
- Echochi Scans

From Shinnen:
Hibiki and Tomoe Kazema are two sisters attending an ordinary high school, but unbeknown to their teachers and fellow students, they are members of a hidden group of ninjas. Their mission is to use their special powers to exterminate the akuma that are plaguing the world. This is made difficult by the fact that their enemies can possess corrupted humans who eventually turn into new akuma.
Despite being faced with an ever growing army, the two are determined to prevail as "The two flowers that will slice through the darkness." The only question that remains is will they succeed against such overwhelming odds?

A story about two young demons who are always slacking off at work, a place that happens to be an organization that vows to keep the balance between the worlds of the living and dead by killing humans! Vol 1&2 contain a small short story about a robot with a mission to 'save humans'

From Nekohana:
Rich young Master comes across a girl alone and abandoned during Christmas. He decides to take her in and name her "Mike". Now he's in high school and she's his personal maid. Did I mention she now loves him and he's rather sadistic with a terrible panty fetish?

From FORTE ATROX: Kang Yurhan is handsome, rich, a little dense, and above all else lucky! But that all changes when his father's company is forced into bankruptcy. Homeless and friendless, he doesn't have a choice but to sell himself to Miss Chunja, a famous fortune teller who seems to have some plans for the poor young man...

Almost two years have passed since Ryousuke made his wish to become a beautiful girl. Although he continuously and faithfully tended the plant that was supposed to make this seemingly impossible transformation a reality, the miracle has yet to happen! To what lengths will Ryousuke go in order to make Gunma fall in love with him? Is it possible that Gunma might actually return Ryousuke’s feelings…!?

In the days of war, a baby fused together with a "shadow" called Blue Dragon, a legend among the "shadows". Because of that, he was locked in darkness from birth until recently, 15 years later, to prevent his shadow from activating. From the beginning, the only person he knew was his tutor who would come see him everyday. But "shadows" have begun to run rampant as they escape from "Noir" through living beings. Humans call for the release of Blue Dragon in order to help mankind; thus their journey begins to seal the "shadows" along with the strongest: their queen.

Noda Haruko has hatched a plot to get tasty lunches; she's put a love letter in a paper airplane and tossed it out into the world. By chance, it ends up in the hands of a lonely boy named Katou Seiji. Haruko confesses her "love" for him, and her hope that he'll become her husband and make her delicious lunches. Surprisingly, Seiji agrees, and becomes her boyfriend-chef. Seiji allows himself to be swept away by her childish enthusiasm, but he keeps trying to find ways to make their relationship more 'real'-- by holding hands, kissing, or simply being alone together. Haruko and Seiji navigate their unusual relationship among their friends and classmates, who all have their share of comedic troubles!

Well, meet Nekoyanagi Kennosuke, a mysterious man who claims to make his living as a miraiya - one who "deals with the future”

Just when Yamamura Fuuta is looking forward to his last summer vacation as a grade-schooler, the self-proclaimed miraiya barges into his life and turns what should have been an idyllic vacation into a series of events shrouded in mystery and filled with spine-tingling encounters. Strange things begin to surface all around the skeptical and unwilling Fuuta.

This is a manga adaptation of Hayamine Kaoru’s novel of the same name. Squeal, gasp, cringe, tremble, but don’t forget to peek between your fingers from time to time as mangaka Takemoto Itoe adroitly transports you to the quiet, fictitious, rural town of Kamikushichou, where the woods are brimming with life in the vibrant Japanese summer.

Yuuki Kimino is a very boyish-girl who saves girlish-boy (and crossdresser) Izumi Junichirou from a train molester. Jealous of his "girl-power", Jun-chan agrees to coach Yuuki on being more girly in hopes that she too can be called cute. However, despite being a girl, acting and dressing like one might be a little tougher than she'd think.

She was the reason he didn't like getting involved with girls much because of an incident in the past. He meets her again and learns that just maybe she isn't so bad after all.

Chopin and Liszt - both great composers, friends, and rivals. Liszt, after Chopin's death, Liszt remembers their meeting, their friendship, their lives together, and the music they made.

Hinomiya is a quiet student who never says anything, but has a supernatural power. He saved Shijiro Sayu a number of years ago when she was falling, and since then she has considered him a friend. One day, an unnatural murder occurs, and a little girl escaping the killers runs into Hinomiya and Shijiro, with the supernatural villains not far behind!

The story is about Kusakabe Sakura, a second-year junior high student who, in the future, discovers the power of immortality. An angel named Dokuro is sent to kill him before he does so. However, Dokuro thinks Sakura can be spared from this sad fate, thus, she keeps him. Another angel named Sabato is later sent to finish Dokuro's dirty job. Pipiru piru piru pipiru pi! From Baka-Updates: From AnimeWaves: Pi piru piru piru pi piru pi~ Along with this mysterious melody, an "angel" comes to Kusakabe Sakura-kun's house and beats him to death. Her name is... Bokusatsu Tenshi Dokuro-chan!? From now on, the everyday fantasies of Sakura-kun's life will be replaced by events more strange and interesting than he could ever imagine... -------- In the future, a man named Sakura is destined to create the technology for eternal life, which (due to Sakura's lolicon tendencies) freezes all women's aging once they turn twelve. God refuses to allow this, so he sends his angels to the past to kill Sakura before he can do this. But one angel, Dokuro-chan, decides to try to change the future without killing him. Problem is, Dokuro is very temperamental, and is constantly killing Sakura (and lots of other people too) in incredibly bloody ways with her giant spiked club. Good thing she can bring people back to life - if only to grusomely kill them again the next time she loses her temper.

From ShoujoMagic:

Yori's attitude has changed. He and his twin sister, Iku, used to be inseparable as children, but lately Yori's been different -- eager to be apart from Iku. Iku worries that he hates her, but the truth is far more scandalous. Now, Yori would risk losing everything to have his little sister. Iku loves her big brother enough that she would never risk losing him, and so she'll do what it takes to keep them together... but Yori doesn't want to have her that way -- as a sister dedicated to her twin. Can Iku ever love Yori not as a brother but as a man?

Boku wa Imouto ni Koiwosuru received the Shogakukan Manga Award for shoujo manga in 2008.

From Neptise Scans:

Dracul's presence threatens humanity and the only ones who can stop them are the Exorcists, siblings bound by blood and granted the power to purge evil. The story centers around Vincent and Ryan and their struggle to become full-fledged exorcists.