From Shoujo Crusade:

For the sake of getting back the present she is going to give her admired senpai, Yuzuki agrees to date the merchant Riichi. Is that a good decision or not...

Gomennasai.
A student hooks up with a woman for casual sex. They have an awkward meeting sometime afterward, in his classroom... because she's a substitute teacher.

Bousou Kiss

"...Gokko"
Brother and sister. A couple plays an incestuous game where they do perverted things to each other until one gives up.

Otoshigoro

One Step

Ferris Wheel
Sudo-san has a lover, who is two years younger than her, Takahana-kun. After receiving the news that Takahana-kun is going to be transferred, she thinks about how to work out their relationship.

Yume Musubi to

Hakuchu Yamu

Yoshi x Yoshi

Only One
Izumi Taeko is a weird and flighty girl, rumor has it you'll only need a coin to get your way with her, but is this true?

- Animexis

Reset

From Tokyopop:

Daphne in the Brilliant Blue take place in a near future in which the remaining population lives in underwater cities, with waterways as streets. Years ago, while conducting underwater experiments, all contact with the surface was cut off. With the remaining human population now living underwater, The Deep Sea 9 Cities Association represent the last hope of mankind. Ai Mayuzumi is the daughter of the head of the research lab, and is an expert water jet bike driver. When the terrorist group Error, attacks the city, Ai becomes involved with the counter-terrorist group Stelnas, comprised of an all-female team, and led by a girl named Kei, and asks to join them. The group initially resists her efforts to join, but a surprising "gift" that Ai possesses, along with the way she handles herself during a kidnapping attempt, eventually sways the opinion of the members of Stelnas.

Akira and Yuujirou, who are childhood friends, both love to surf, and both have an unrequited love for each other. This is because after Yuujirou kissed Akira a year ago, she slaps him! Now all he does is bully Akira, whilst Akira has feelings of regret for slapping him!

Oneshot about Takeshita Mari, a 3rd year in Junior High School who has a crush on her teacher.

A collection of stories:

- Houkago Canon (After School Canon)
Sakuragi used to be an athletics ace, but after a traffic accident rendered her unable to run, she was forced into joining the student council. As she is quite useless at the sort of work they do there, her primary responsibility became finding the president who would always disappear. After finding the president one day, however, she reveals the reason why she always disappears...

1) Affair
The reunion of Yoshiyuki, who still nurses a grudge, and Okabe his senior in the baseball club of high school.

2) My Dear Mad Dog
A pair of half siblings attempt to navigate the Yakuza world and their complicated relationship.

3) One Lucky Guy
Two co-workers play a game of honour, luck and Mahjong.

4) Love Machine
A university student decides to get his driver's license and a fellow student offers to be his instructor.

5) Erotic Affair
A humorous and erotic extra of chapter 1.

From Mangascreener:

The only common feature running through these stories is a grown-up protagonist somehow coming face-to-face with his childhood past, in a testament to the loss of youth, the disillusionment of growing old, and nostalgia for better times.

In the Adachi pantheon, this is a rare diametric view of his eternal theme of "youth," in this case youth as seen through the lens of the past. It's a powerful statement from Adachi that might even be an acknowledgment of his steadily-creeping age.

What is impressive about these stories is not the plots or characters themselves, but the absolutely perfect way he tells them, another facet of experience that comes with age. Most of the stories may require multiple readings to fully appreciate the airtightness of the plot and visual motifs."

From Liquid Passion :

Katase works at a workshop which specializes in the traditional, intricate art of yuzen dyeing. He doesn’t get along well with others and deliberately keeps people at a distance. This changes when he’s told to allow a friendly young man in training to stay at his place.

The "Dark Flower" is a sword of legend; a horrible legend of a gruesome slaughter three hundred years past. Lilia, a small girl from a village threatened by the bandit group whose leader has obtained this cursed weapon is now searching for help to save her city. Unfortunately, she is spotted by the bandits and can only run for her life. But, just as she is about to be caught, she runs into a young and seemingly weak traveller... is this coincidence? The Winner of the 14th Square Enix Manga prize.

This is an original story expanded from the STEINS;GATE game, and focusing on the heroine Amane Suzuha. In 2036, a monopoly on time machines has created world peace, but at the cost of human liberty.

Suzuha has followed in her late father's footsteps in fighting alongside the Valkyrie rebellion force to change the world. After the group fails on a major mission, Suzuha has almost no hope left. But then she discovers that her father left something for her: a time machine. Using this, maybe Suzuha will have the power to finally destroy this dystopian society and create a better present and future!

Sara Tanjuro just recently transferred to Mikagami Eruma's elementary school and have caused a major stir among the students. Tanjuro, knicknamed Satan, has been proposing his love to the girls left and right, something the shy Eruma would never think of doing. But Satan has a secret identity. He is a member of Michaela, a group of people who combine technology and exorcism to rid the world of angels that wreak havoc in society. As member number 666, Satan is an anti-angel specialist who has disguised the school supplies as weapons. He defeats supernatural beings with ease. Now if getting girls were that easy...

From Iskultrip Scans

Yamada Hana, a high school girl, woke up and found herself in a strange land after being enveloped by a bright light that came out from a mysterious book. There, Hana met a young man named Gentoku, and ended up staying with him and his army as "Koumei's disciple"…

It all started with a "net cafe." The hero Toki Koichi is a soon-to-be father leading a complacent life. One day, he happens to stop by an internet cafe, and there he bumps into Kaho, his first love from his junior high school days. Having just fought with his wife, Koichi's heart is filled with his old feelings. All of a sudden, a strange wave flows through the computers and cell phones in the net cafe, and the entire place blacks out, just before rain begins to pour outside. Unable to leave safely, both Koichi and Kaho stay overnight at the net cafe. The next morning, when they step outside, they find the world is completely different. Koichi is determined to find out why the entire cafe has transported him to a different world, and to return to his family in the original world. As he fights against various fears and tries to solve the mystery, people start to disappear one after another. Can they all survive through such a crisis and what is the secret of his first love with Kaho?

Akari, who loves books, moves to Tokyo to go work at the head office of a bookstore. There she meets the assistant manager Terayama Morizou, who loves books more than people. Up 'til now Akari hasn't worked at such a large store yet so she feels a lot of pressure, but at the same time she realizes she really loves her job. This manga depicts the struggles she experiences at work as well as in her personal life.

From Shoujo-Sense:

Ririko has been in the hospital for 10 years. During that time, she was writing a note for her wishes that she wants to fulfill. Will she finally start realizing those wishes?

A seminal history of Date Masamune. Yokoyama has a plain and matter of fact style for history without really trying to dramatize it.

The main protagonist is an Iga ninja named Saizou, who meets an Izumo priestess and protects her on her short journey to Sanada Yukimura. Sanada Yukimura is a powerful warlord in the Sengoku era. Sanada wants to gather 10 warriors, a party unrivaled in skill and power, to set his still secret plan into action.

Bard is a tough guy involved in a shady business; Sei is a tough kid engaging in some shady dealings. Through sheer stubbornness (and the fact that Sei-kun made a very, very bad hooker), Sei ends up working for Bard, and there's instant attraction.