From Shoujo Crusade:

Once upon a time Little Red Riding Hood Risa fell in love at first sight with Ren, a boy from the wolf tribe. She pursues him even though it is forbidden and despite Ren's rejections. What will happen?

From Hochuuami:

A bored magician, Kei, meets Takanashi who is supposedly a card dealer on the cruise ship he's working on. He truly has no idea what's in store for him when he runs across Takanashi. For starters, how about a game of... strip poker?

One of five oneshots released for Valentine's Day 2011 by Summerzoo Studio.

Super sadistic gay high school student and a kind teacher.

From Tinte:
Suh Hyun-bin grew up under the cruel hand of street gangsters, but after her little brother dies, Hyun-bin runs away and is taken in by a rich family to be trained to become a bodyguard. However, she must hide that she is female, and pose as a man. And so, for eight years, she grows up as a cold, male, bodyguard. It looks like she'll be this way forever--until a fateful encounter with Lee Yun-ha shakes her very foundations, and leaves her conflicting with herself, as her feelings of love clash against her feelings of duty.

First year Hino Teppei of East High has a lifelong enemy.
His nickname is “The Demon of the West,” but his actual name is Onikubo…a second year whose goal in life is to tangle with East High students.
No matter how many times he gets called out, he’s so strong no one can make a dent…and yet, he only has eyes for cute things!
One day, Hino picks up Onikubo’s chick coin purse, and Onikubo thinks “that yellow nape of his makes me think of a chick”—and becomes attached to him!
Furthermore, he’s able to go from “I don’t hate you” to a kiss…?!

A one-shot story about a boy that is blind to everything but love.

The outstanding but timid Layla, who is secretly in love with her senior, happened to meet a boy named Shawn and heard each other's secrets. In order to protect the secrets, the two reached an agreement, and Shawn begins to help Layla pursue her senior. A sweet campus romance began.

Though 4th year elementary school student Aikawa Himeno has feelings for her classmate Ouji-kun why can't she properly express her feelings? A story of a slightly precocious love comedy.

Kisa has fallen in love for the first time. Her crush is the popular 'philanthropist' and president od the student council Ichikawa. Despite being kind and cool, no one is able to approach him. When Kisa decides to confess her love, she will find out the reason why: Ichikawa has split personality disorder. Now, how will Kisa's fate be...?

From Manga-Heaven:

Eitaro is hooked to the erotic chats... Someone steals Sakuko's lingerie... Ai is determined to lose her virginity... Everybody is hooked on love... or is it to sex?!

An erotic manga by Kyo Hatsuki following the trials and sexual triumphs of the main character. The story travels from - "Will he ever get laid?" to - "Will he ever get a steady girlfriend?" to - "Will he ever learn to keep it in his pants?!"

One day, high school girl Sonoko forgets something so she goes back to get it. She glances out the window and sees a boy in the schoolyard, surrounded by unconscious and bleeding bodies!
The boy is Narusawa, and blood runs down his cheek, and he has a dangerous look in his eye. He is one of the toughest guys in the school, and had beaten up the guys at his feet. He senses Sonoko looking at him and turns to her.
Sonoko's school is co-ed, but the girls only have classes with girls, and guys with guys. At this school, most of the guys are the loud, rude, dangerous, violent gang-member type. Most of the girls know to stay far away from them.
But, things are about to change when this kind of boy asks her to be his girlfriend--the dangerous Narusawa-kun himself! He waits for Sonoko after school and follows her around. He seems to really like her! What should she do?
Narusawa has a different side to him that he is willing to share with Sonoko. He can be kind and funny. What a strange couple they would make! There are a lot of obstacles in their path to love. Narusawa is willing to tackle them, but can Sonoko face her own fears?

High schoolers Rin and Kyo are childhood friends from kindergarten. They're so close that there's virtually nothing they don't know about each other.

Rin, who had been pining for Takahashi-kun, his father's lover, for many years, finally gave up and wished for his father and Takahashi's happiness. After his broken heart was comforted by Kyo, Rin was finally able to stand up again, but then suddenly, he was confessed to by Kyo...?!

Note: Kagerou Scans has two versions of their release. One with the name "Kyo", and the other "Kiyo", which is the correct spelling.

Sakuya, another of Dr. Shindou's androids, is on loan to fellow doctor Kurusu as a maid. In his efforts to help, Sakuya has gotten Dr. Kurusu to quit smoking, but now the good doctor has a craving for something sweet...

From Awakened Memories & Fate

1-3) Love Knife
Afraid of being alienated, Asahi doesn’t say what she really thinks. Sou, who is always true to himself, has Asahi’s admiration. She is about to go to a love hotel with her boyfriend that she doesn’t even like, Youhei, and gets saved by Sou… The admiration for Sou starts turning into love. Even if she turns everyone around her into an enemy, she chooses Sou but…!?

4) Antique Girl

5) Teatime Is At Midnight

From Attractive Fascinante:

1-2) Love Knot & Re:Start
Tomoya rejected the confession from his classmate, Kazuki, stating height as the main reason. Two years later, Kazuki became taller and came back once more. However, the Kazuki that used to protect Tomoya in fights became gentle and kind. Will Tomoya be able to face his own feelings now and accept Kazuki? Includes the individual stories of the twins, Yuu and Kaede, with their lovers, Shougo and Jin and two one-shots.

3) Loveliness
Twins Yuu and Kaede have similar taste and men, the question is does Yuu need to steal Shougo's heart or was it his in the first place?

4) Use That Arm Again to Hold Me
Jin want's to know why Keade broke up with him a year ago via e-mail with no explanation, he's determined to get Keade back.

5) Just Love the Way You Are
When Jin see's how depressed Yuu is he decides to take matter's into his own hands and confront Shougo.

6) Captive
Will the playboy infirmary sensei Kajimoto ever change?

7) Blindly Love
Kaname doesn't know if his senior Arisawa Rie is serious about him or if he's just playing around.

From Shoujo Manga Maniac:

1) Love Lab
The chemistry club invented a special hormone potion. Each bottle cost 500 yen. Riko-chan's boyfriend, Yuuki-kun himself is extremely cold towards love. Riko-chan hopes to move their relationship one step ahead, but in the end...?

2) Merry Kiss

3) Perfect Doll

4) Twinkle Twinkle

5) Cupid's Arrow

The Fujisaki Girls Academy is known for their school body being composed of very proper students. The most prominent one of them is Maki, the student president who is admired by her classmates for her calm and polite demeanor. On the other hand, Kurahashi Riko is also admired but for having a very forward and boyish personality. Riko accidentally walks into Maki while she's practicing kissing with a pillow and learns that she isn't what everyone thinks she is. Riko is forced into keeping Maki's secret and join her in practicing all aspects of romance like holding hands and more

Sunae meets the ghost of her dead twin sister.