From Blue Flor:
Life is hard enough as it is without the complications love interests bring. However, it becomes even more complicated when the interest in question is a friend. How does one choose between what is right and what is wrong? The male friend you've always been with or the one that's recently come back?

This is a set of five short stories about the trials and tribulations of five different women:
1) Diamond
2) Only 5 cm
3) Inside the Mosquito Net
4) Inside the Mosquito Net 2
5) Hide and Seek

Suga and Hara have been close friends since junior high, and became housemates in university. Hara, a cool guy and popular with girls, is completely unaware of his own popularity, and Suga is proud to have him as his closest friend. Although Hara makes him feel uneasy by how much he looks after him, if Suga's honest he actually slightly enjoys it...... Suga ends up developing feelings towards Hara that go beyond friendship, but he's happy with the way things are between them. It's just nice for him to be by Hara's side. One night, Hara tells him that he'll be coming home late. Suga, who's finally able to spend some time at home alone, finds Hara's jacket lying on the sofa. As he takes it in his hand, Suga's scent pervades the air, and Hara gets unwittingly turned on...... It's a slightly naughty love story about two guys joined at the hip, and it'll get your heart racing!

from Renta!

From StarryHeaven:
Jun has always liked the super popular and hot Kazumi-kun. However, he always has girls competing for his attention. So when the newest issue of a shoujo magazine comes out, she buys it for the furoku (freebie): a paper charm that you write your wish on and put under your pillow so that it’ll come true. Her wish? To be with Kazumi-kun. She doesn’t expect the charm to work anyhow, as she’s never had any luck with them. To Jun’s surprise and delight, in the morning she wakes up to find that she’s friends with Kazumi–but in a boy’s body!

Chuunibyou girl Ayame-chan is enjoying a country life filled with nature with her simple and innocent friends! The delusions of Ayame-chan with regards to her friends, also explode! It seems she still haven't thrown 3D out of the window yet....

From etc:

Eiko is something of a plain Jane and a doormat, while her best friend Moe is a head-turning beauty. Despite their differences, their friendship is as strong as ever.
Guys are always asking Moe out, but her answer is invariably "Only if you promise to put Eiko before me."

I don’t need any deep relationships. I have no desire for a girlfriend, and I only require one friend who holds any value to me. Ever since I threw out my youth for the sake of efficiency, there is one person who keeps entering the bedroom of Ooboshi Akiteru. She’s neither my little sister nor my friend. She’s nothing more than a bothersome, annoying Kouhai, as well as my friend’s little sister: Kohinata Iroha.

“Senpai, let’s go on a date~! Did you think I’d say that~?”

Rather than blood, it seems like energy drinks run through her veins. She keeps occupying my bed, and she tries her best to seduce me with whatever method she can play to her favor. She’s a girl who’s constantly annoying and obnoxious around me. Even though I’m busy all day long, she doesn’t care.

And in case you’re wondering why all these envious gazes are directed at me, it’s because Iroha is actually really popular. She’s an honor student at our school with top grades to boot, and she’s known for being kind and proper to anyone she meets.

…Hey now, why are you only so annoying when you’re around me?

This series is about Rio, a college student who has been in love with her best friend's father, the pharmacist who runs Izumi Pharmacy, ever since she was a kid. As for Izumi-sensei, he's also attracted to Rio but has been holding back because his son is also in love with her!

The lonely high school girl - Misuzu, with the perverted young man - Shoutaro's cooperation (obstruction), take up the challenge of making friends together!!

1-2. Yasaotoko wa Venus

3. Tomodachi Over (Friendship Over)
A model who is afraid of women surrounds himself with an all male staff, but a newcomer may prove to be dangerous to the model's peace of mind.

4. Kakero! Ai no Tonakai

From Chibi Manga:

That day, that time, if I had not met you, I wouldn't have come to know this feeling...

"Last night, I lost my friend."Sharp-tongued Sana and blunt Asa have been best friends since high school. They go drinking with each other, live next to each other and know each other better than anyone else. But a fateful summer night leaves their relationship irrevocably changed...

After the death of a close friend, Tomoe, a former roller skater, joins a famous stunt men troupe, the Green Ship. The head of this troupe, Kazusa, becomes her lover, but Tomoe soon discovers that the Green Ship is a sinister crime organisation and that her dear Kazusa is a cold-hearted killer. A difficult struggle begins for Tomoe, not only against the organisation but to get away from Kazusa, who wants his lover back, dead or alive!

The students of Kamishiro High-School Class 2-A swore revenge on their homeroom teacher, Takao Nanami. Against her, a fake suicide had been concerted, meant to be played out by one of her students, whose actual death would later sink the class into confusion. Who soiled the water with blood? Skinned of its trust, their friendship became an urge to sate each other’s hunger.

At Sakurazaka High School, students in class 1-A can get involved in an unreasonable game called "The Friends-Eater Game", in which one of the conditions of the game is to eat the bodies of their friends to survive. Cannibal school begins.

Tomoi is a youthful doctor who dislikes women. He has a twisted personality replete with arrogance, egotism and a venomous tongue. After his fateful encounter in NYC, Tomoi returns home to Japan.

During the Interwar Period (1925-1932), Tomoji lives in the Japanese countryside while Fumiaki works as a photographer in Tokyo. One day, they meet... This story is inspired by real characters who founded later a branch of Buddhism.

A high school debut with a classmate. A Kabedon from a cram school friend. A date with a hobby friend. A love confession from a childhood friend. This is a collection of four love stories between friends! Experience a dreamlike love from a male friend that will fulfill a girl's desire for a pounding heart. This is the first omnibus by an up and coming shoujo mangaka!

Contains five sweet and lovely slice of life stories about kids, and one bittersweet young romance. The title story Tomonen is about a trio of kids who get lost in the woods and wind up befriending a young witch. A series if vignettes paint us a picture of their time together as they explore a world touched by magic.

The story of grim reaper who prevents death Choi Jun Woong (27,M) has everything except job He get to work in the underworld business by accident He work as the contract worker for special team -- crisis management team and help people in crisis.

Maaya lovers herself very much.