Based on the visual novel by Enterbrain with the same name.

Note: This manga focuses on all of the girls at once, instead of different arcs.

Takatoki is a high-school boy with an intense obsession for manga and anime. He desperately wants a typical anime romance with a girl who falls into a typical female anime stereotype. His childhood friend Chiyoko, a very unladylike girl who is a notorious fighter, tries in vain to get his mind back to reality.

One day, the two of them run into a girl in a sailor schoolgirl outfit being threatened by a generic band of thugs. As Chiyoko beats up the thugs, Takatoki learns that the girl, Asadzuma Youtsugi, is a cosplayer who wants to lead the life of an anime character. Was this Takatoki's fated first encounter with his future anime lover!?

"In a Fight, they say that the first one to bleed from his or her nose is the loser. Father, Mother and Brother...They're all LOSERS that bled from the nose facing that damn monster called WORLD!

I'm not going to fall into that one. Even though I have to break my head, I'm not going to bow my head before anyone. I'm going to finish everyone! I'm going to throw everyone on the ground with the "Ushi Mata".
Even though my opponent is...a GIRL"

The Boy that doesn't bow his head to anyone...
SUK DONGMIN

Sakaki, the president of an interior designing company, is determined to never get serious with anyone - fearing the heartache he feels that it is sure to cause.
Much to his discomfort, he realizes that he is beginning to fall in love with his older heterosexual co-worker, Okada.

Sakaki is shocked when he finds himself in Okada's home one day, with no recollection of how he got there. At first convinced that he did not act out-of-line at any point, Sakaki feels more and more unsure of this as he notices the changes in Okada's behaviour towards him.

Will this storm that's brewing on the horizon ever calm down?

(Sakaki also appears as a minor character in Signal, a story set two years prior to the events in "After a Storm")

Set within a ravaged world, a girl protects the people from these monsters is interwoven into this mysterious fantasy.

This is a oneshot from the Moonsorrow Collection II.

"Originial" doujinshi by the circle Moonsorrow.

From ADV:

A mysterious creature has fallen from the sky and landed right at young Yuina's feet! Branded as the master of this new angelic being, Yuina is forced into an otherworldly pact, one that will take her beyond the clouds and into battle against a new and yet hauntingly familiar evil, one that patiently waits in the shadows.

From ShoujoMagic:

"Forgive me. I can't become a servant of the Lord yet," Maria says as she runs from her vows ceremony at the convent where she was orphaned 16 years ago. She has received another letter from the mysterious "G," her faceless benefactor. She is not as alone in the world as she thinks; "G" writes that she has a relative at Hakuhou Academy who is in need of her guidance, but he cannot tell her this relative's name. Trying to enroll and search the school presents Maria with a number of problems, however -- the foremost of which is: Hakuhou is an all boys school!

A legendary dragon once brought the land of Astoria to the brink of ruin. He was defeated by a man named Yurius, who was soon supposed to go to his princess and live happily ever after. However, with the last of his strength, the dragon placed a curse on Yurius: all his memories will be erased, and his body will turn back to a child. It is now the goal of a novelist, Elliot, to return Yurius to the courageous person he once was.

From MangaArt:
The story begins when Hui-Sheng, a seemingly ordinary high school girl, receives a deck of angel cards from a mysterious stranger, Jason. With the angel cards, Hui-Sheng attempts to find out who her guardian angel is. But the result of the reading (a blank card) shows that she has none...

Shiina Amane is special. Her father is an exorcist, and she herself can see spirits. But gifts always come with a price.

N/A

When a devastating meteor struck Earth, Earth's guardian angel Lyu was so tortured by guilt that she killed herself. Mo Ye, the demon who was in love with Lyu, is determined to find her again. Has he found Lyu's reincarnation in the human Xiao Tian Nu?

Tomoki, a high school student lived with his older sister. What happens when a normal boy has to put up with his sadistic but popular sister?

Rosie's mother loved her father till the day she died... even though he abandoned her when she got pregnant. Rosie wants to tell her father how her mother felt, so she goes to work at her father's mansion as a maid. However, her father isn't there. Instead, a sexy man named Sebastian meets Rosie. Rosie is won over by his kindness, and before she knows it, she ends up in his bed. Will Rosie now share the same fate as her mother?

Shirafuji's feelings of physical intimacy between him and a classmate, Arisaka, are piling up. He wants to know how Arisaka truly feels about him, but he doesn't have the courage to ask, without exposing his "true feelings." He is terrified of getting hurt, even a little, but now it seems that his love is about to lose sight of reality.

Two couples from this volume have sequels in another of her works Agetai Kimochi.

Arisaka x Shirafuji from ch1 here and ch8 in Agetai Kimochi.
Eiji x Yuusuke from ch7 here and ch2 in Agetai Kimochi.

Chapter 5 is hard shota content, and not scanlated for that reason.

A short 26 page story about a student-teacher relationship. The teacher breaks it off and after 6 years pass, the student is now a teacher also and they find that their feelings are still the same.

1) You Are My Flower
Yuuto has been living for years with Hisataka but he's wondering what are his true feelings for his lover since in the beginning, he accepted the relationship without being in love with Hisataka...

2) Moving Forward Hand in Hand
After changing shifting seats in the classroom, the shy boy finally got to sit next to the prince of campus. Will he be able to look beyond the facade and see him for his real self.

3) It's Still Impossible to Turn Them into Memories
He got the biggest shock of his life when he turned up for a rock concert only to discover his friend has invited his past lover without knowing that. Now they have to pretend to be nice to each other despite the bitter break up in the past.

4) I Want You Only
He doesn't quite get it why he is always getting dumped even though he is pretty popular. He jokingly tell his childhood friend that he might as well turn gay to avoid this terrible fate. Surprisingly, his friend volunteered for the position.

5) Feelings of a Flowers
A mutual lets on that Hisataka is actually really popular with the ladies and Yuuto is finding it hard to believe, until he sees it for himself.

HEARTBREAKER

Terry has been in love with J.B for 7 years. He is a wealthy and powerful playboy, but he took her in when she had nowhere else to go, and was like family to her. She hoped he would reciprocate her love one day...but J.B breaks her heart instead. "Do you think I would ever want you?" he tells her. Distraught, Terry runs out of the house and is involved in a road accident. When she awakes, her memory has reverted to when she was 17... When J.B used to care for her...

English publication via Renta!

A collection of 5 short stories.

#Story 1: Anata o Ajiwaitai
Mai is working part-time as a home tutor. Ritsu, her student's brother and a high school student, tells her "Teach me too" and the teachings go beyond mere kisses. Mai is completely addicted to Ritsu but the future of their relationship is...?!

#Story 2: Yukemuri Nureru Yoru
Touko and Ryuunosuke are secretly dating. Touko can't be honest with her feelings. Even though she acts calm, she feels anxious when she finds out that her boyfriend has been meeting up with another woman. How will she handle the situation and her overflowing emotions?

#Story 3: Renai Master no Otemae
At Kumakita High School, there exists a club to solve love troubles. Student Council president Jounouchi challenges Mayuko that if she solves his problem, he'll officially recognize their 'Love Club'

#Story 4: Amaku Kiken na Bouken
Minami has been interested in Hibiki for a while now. One day, while on the way to school, Hibiki leans on Minami's shoulder and falls asleep in the train. Minami gets nervous and doesn't wake him up and so they miss their stop. Thus their adventure starts...

#Story 5: Tsumi Koi
Asuka is in love with Tsubasa but she decides to hide her feelings because her friend Yuuko has a crush on Tsubasa. Yuuko transfers to another city leaving behind a letter for Tsubasa in Asuka's care. Even though Asuka decided to support Yuuko, she can't bring herself to hand her letter to Tsubasa...

From ShoujoMagic:

A collection of short horror stories from the pages of Ciao Magazine.

Story 01 - The Scream of Glass
Story 02 - I Want The Lead Role
Story 03 - Exciting Mysterious Club
Story 04 - I Want To Be With You Forever
Story 05 - Haunted Afternoon
Story 06 - My Place In The World