From JShoujo Scans:

Although she doesn't get along with people very well, Kanoko considers herself a perfect "observer". Her hobby is observing the students in her third year junior high class and keeping a journal of the classroom drama. But what will happen when Kanoko becomes involved with some of her classmates?

(From Sweet-Lunacy) Armelia is an orphan girl who sings for work. One day, she met a boy, Luce, and falls in love with him. Unfortunately, Luce was kidnapped by the notorious pirate, Scar. Armelia swears to herself that one day she'll rescue Luce. But the truth is not what she thought it was... The second story is called Haru wa Sakura and it's about a meeting between Shou, who wants to become a physician, and Sakurada Sakao, who desires to make his fortune with his own hands. A delightful oneshot!

From: Easy Going Scans

Nana, a young boy suffering from extreme amnesia, has forgotten his real name. After helplessly witnessing the unjust death of three children during one of his trips, he vows to eradicate all wars of the surface of the earth.

He then joined Tripeace, a small group of activists whose members use all kinds of weapons and will stop at nothing, not even violence, to bring peace to the world. But soon, the new registration number 102078 of Tripeace is faced with a dilemma: can we protect peace at all cost?

From Viz:
Carefree Megumi Kuroishi was living a life of luxury until the day a girl named Suzuka Kogami walked into his life. All of a sudden, Megumi finds himself kneeling at Suzuka's feet and prostrating himself like a servant! What Megumi doesn't know (until that very moment anyway) is that his family is cursed to follow the orders of the Kogami family.

Also contains the extra one-shots:
- Let the Time Freeze
- Realistic Storm
- Tell Me the Real Meaning of That Kiss
- The Long Night of Pere Noel

From Nagareboshi Manga:

After being overseas for five years, 16-year-old Yamato comes back to Japan to find that her geeky best friend, Ai, has turned into a delinquent, and wants nothing to do with her! Yamato tries to revive her relationship with Ai while finding out about her troubled past without Yamato, and why she changed.

It's the year 2020 AD, and Tokyo II is a city infested with crime. Women can no longer go out in the streets alone without being victimized. Not wanting their daughter to suffer the same fate, Tsukasa Kozuki's cop parents raise her as a boy. When they are suddenly killed by one of the yakuza's in-fights, Tsukasa is left orphaned on the streets along with her three brothers.

With no other options, she goes to the only person she can think of for help: pokerface Ryuji Shirogami, her classmate of 8 years and also the head leader of the powerful yakuza group, Kuryugumi. Ryuji, whose father was also a victim of the same yakuza fight, agrees to take her on as his personal bodyguard. As they set out to find their enemy, Ryuji slaps an increasing amount of debt onto Tsukasa, using all manner of ploys to keep the reluctant Tsukasa by his side.

1) Mint de Kiss Me
There is a legend that if you kiss the man you like with a mint candy in your mouth, you can become one with your love. Misono is a rather superstitious girl who decides to test this out on Tohno-sensei, a young teacher she has a crush on. Unfortunately for her, she makes a mistake in the attempt to surprise him and instead kisses her fellow classmate Shindou. Of course this would be the time for the legend to work quite literally as Misono’s spirit enters Shindou’s body.

2) Genseika
Chiya goes to school with her friends and witnesses one of them die suddenly as a flower bursts out of him. The three friends had been together since elementary school, the death hitting Chiya and Yutaka hard. When other people begin dying from the flowers, they investigate possible reasons for such usual deaths. To her surprise, she finds answers close to home.

3) Furimuke Romance!
The hero of girls targeted by guys peeking into the locker room, Taka has quite the violent tomboy reputation. But all she wants is for some handsome guy to ask her out. A cheerful street vendor, Ryouta gives her a special ring with a heart locket pendent to hold pictures. When two photos are enclosed, romance is in the air.

4) Hang in there Nakago
Involves the scenario where Fushigi Yuugi was actually done by real actors. Unfortunately, Nakago (stage name) is a lot more unconfident than the character he plays. At least his one main fan, an unnamed woman with flowers, is there to support him through his worries.

From ShoujoMagic:

Ever since he was small, all the girls in the neighborhood have fawned over Tsutomu Yamaguchi, whose name came from a song and whose adorable face closely resembles the monkey character Monchichi's. Even back then, it was enough to make his friend and neighbor Mikako sick. Now that he's a little more grown, Tsutomu looks like the lead vocalist of Manbou, Ken Nakagawa (Midori friend/boyfriend from Tenshi Nanka Ja Nai; we meet main characters from Tenshi on market/fest), and that makes him even more popular with the ladies. But Mikako--now a trendy teen with modern sensibilities--couldn't care less. Or could she...? Gokinjo Monogatari is a sharp-witted and stylish slice-of-life story!

Continuation (after years) in Paradise Kiss.

From ShoujoMagic:

Story 1: Automatic Angel
Serika, a high-school student, is known for being a well rounded girl with an attractive face and figure. She is clear-headed and has a talent for sports. But she's an... android!?

Oneshot: The Winter Was Trying to End
Tale of a high school professor and student.

Much to her embarrassement, the shy Mashio-chan wins a set of couple tickets for the amusement park. She feels at a loss for what to do since she has always been bad with men. So what will happen to her when the drama club president Katokura Aki suddenly declares that he would erase her awareness...?

From Yen Press:
Michiru Kita’s a weak-spirited girl who has a hard time saying what’s on her mind. One day, she notices mysterious, ring-like markings around the necks of two of her classmates, Chika Akatsuki and Shito Tachibana — two boys who miraculously survived a horrible accident six months before. Michiru, possessing the rare ability to see these rings, knows that they warn of impending death. Thinking that, perhaps, she can do something to save her classmates’ lives, she approaches them…but it seems the boys have already made a different kind of deal and garnered themselves a heavy debt.

One day, Nao's father suddenly announces shocking news! Because his friend helped him with his debts, Nao's father agreed to have Nao and his friend's son engaged! Nao is furious with this agreement and transfers to her fiancé's school, Kaei Academy, in order to make her fiancé break off the engagement. But how can Nao force her fiancé to break it off when she doesn't know what he looks like?! Join Nao in her quest to find her "husband-to-be"!!

"I want to get it on with my cute girlfriend!! But whenever the time is right, a ghost gets in my way?!"

Alicia Faitlin, daughter of an impoverished aristocratic family, was forced into an arranged marriage by her uncle, but the groom is killed suddenly in the middle of the ceremony.

Although Alicia has been labeled “The Princess of Death” due to this incident, there's someone pursuing the matter of a second marriage with her. He is an upstart noble whose family was recently promoted to the ranks of the aristocracy, Kashburn Licen. This man is rumored to be a "Tyrant" but-?

From Transcendence:
Tong Danwei is a high school freshman with romantic dreams about the boy she is fated to meet. While on the way home from picking up groceries, she runs into a pretty boy, and that’s where our story begins. Will she find love in high school? And more importantly, will any boy be able to overlook the fact that although she is in high school, she still looks like an elementary student?? Follow along on Tong Danwei’s adventure of love and high school angst, with plenty of comedy thrown in to the mix.

When corruption consumes the world, the akuma with 101 mouths shall appear. Humanity forgot about their existence, continuing to indulge in sin, until the day when the akuma arrived, and dark descended. Some continued to fight, and after seven days of struggle the akuma was destroyed. Or so they thought. Immortal men marked by the "mouth of the akuma", continue to wander the world. A man bearing the mouth of the akuma, named Godot, has blackmailed a town, extorting food and supplies, and in exchange promises not to harm the inhabitants. One day a man appears, also bearing the mouth of the akuma, accompanied only by a young girl named Haru, whom he calls his sister. Claiming to be an akuma eater, he promises to rid the town of Godot once and for all. Who is this young man, and what are his intentions? How does he plan to kill his fellow immortal, Godot?

Akagi, after being rejected by a girl that he likes and punched by a rival, Rukawa, for accidentally stepping into his confession moment with the girl, wants revenge against Rukawa for various reasons. He and his teammates decided to challenge Rukawa and his team against a game of basketball in the regional tournament. Who will win this basketball game?

Rintaro Senkawa is a middle aged guy who got a little drunk one night and died. But that is just the beginning of this story as Rintaro finds himself most unexpectedly in Hell where he meets his guide, the devil Koyori.
Can Rintaro take his situation seriously enough to repent for the sins of his former life, or will he face the favored weapon of Hell- the spiked iron club?

From Anime Waves:
The woman Tsutomu encounters in college was older and smaller than he is, and for some reason, looks like the same girl in his dreams. The heart-pounding love affair between him and the "older woman" begins.

The year is 2130. After the third world war, large contaminated areas known as "Blackspots" formed all over Japan. Large Walls were used to quarantine off these "Blackspots". In time, signs of inhabitance appeared within these wastelands. Among the survivors who had been abandoned inside the Blackspots, labeled as "those who were unneeded", came forth possessors of uncanny abilities -- Fire, wind, brute strength... they were defined by their supernatural abilities. Others, fearful of their powers, expelled them and named them - Needless.