From SCX-Scans:

It tells the story of a couple, both very innocent and in love with each other, who are now living together! Takeshi is a pure-hearted college student who is enticed by his girlfriend that has run away to live with him. Temptations ensue.

Just before entering the university, Yanagiba Masahiko's father died in a car accident. His mother died when he was four, which makes him now really an orphan. But even before the death of his father, he didn't have a family life, as his father was always busy or abroad.

When his mother's younger brother and his wife decide to invite him to live with their family, his life takes a turn. But it is not going to be the normal family life he is imagining for himself. What is the "terrible" secret that led his parents to break the bonds with his aunt and uncle? What could be the true nature of his cousin, Shion? And last but not least, will this "terrible" secret eventually get Yanagiba, too?

A woman F.P. Ageha helps people in their problems.

From Tokyopop:
In the year 184, three leaders (Yoobe, Kwanoo, and Jangbe) rose up against the oppressive Chinese government and were all killed. Now, a 17-year-old shaman by the name of Aram Ko is in search of the reincarnations of the three men. Back in the year 184, Kwanoo had saved a man's life and, in return, that man ensured that every one of Kwanoo's female descendants became a Shaman so that they could serve Kwanoo when he is reincarnated.

Onizaki Teppei is a high-school freshman who just wants to live a plain student life, but his world is rudely shaken by a mysterious girl, Mitogawa Enma, who declares her intent to find a husband at the school!

From ryColaa:
Our hero, who doesn't know how to swim, joins his school swimming club and begins to learn from their star swimmer who loves swimming more than anything. Good thing she's cute and nice to boot!

Fortune Arterial's story revolves around the male protagonist Kohei Hasekura, who transfers into a prestigious public school--an English style six-year school, serving junior high and high school students. The school, named Shuchikan Academy, is on an island, Tamatsu Island, off-shore from mainland Japan, and the only way to get there is by boat. This is a series of characters' introductions to prelude the main story.

Naota's life isn't simple: he lives with his eccentric father and grandfather in a two-story house above a family-owned bakery in a town marked by a gigantic factory at its heart. The factory looks suspiciously like a hand iron, complete with a steam release at the top--not the most typical landmark. Life is already strange enough, but to top it off, his older brother's ex-girlfriend starts making extremely suggestive passes at him... and an impish, playful alien smacks him in the head with a bass guitar and then infuses herself into his family.

Jiga Kirishima lives in a time where the only sky the people know is the color gray and most of the world is wasteland and ruins, with a few people in power depriving resources from the disorganized weak and poor majority. With his father's sword, Jiga makes friends and enemies and goes on adventures while searching for others who share his bloodline.
Jiga's sword happens to be made of a rare material which a powerful organization known as Lost Eagle Nest claims to want in order to rebuild the world, but is that what they really want it for? They'll stop at nothing to take it from him, and Jiga and his friends now have a price on their heads.

From Tokyopop:
Hideki's just like every other guy in the 22nd century. He just wants a good job, a good car, and a sexy robot girlfriend to call his own. Until he lands a job, he'll never be able to afford his own 'Persocom' companion. Hideki's luck changes when he discovers Chi--an adorable but seemingly stupid Persocom--tied up in a pile of trash. His first robot companion turns out to be a lot more responsibility than he expected, and she gets him into quite a few embarrassing situations. It's 'boy-meets-girl' for the cyber age.

Foreign exchange student Alyosha Stalina has been attending a Japanese high school for 3 months. She comes from the nation of Solessia but she is yet to fit in with the other students because of her unfriendly demeanor and cold personality. Rightfully so because Alyosha is a trained assassin that has been murdering people since she was 5 years old. Officials in Estolakia, a country devastated by the attacks from Solessia, found the orphaned Alyosha and trained her as a top notch assassin to work against Solessia.

Her most recent and soon to be last mission is to murder the president of Solessia who is to attend the high school she has infiltrated for 3 months. However, the mission is aborted and she is ordered to remain a student. The only thing Alyosha knows how to do is to be an assassin and has never learned how to be a normal teenage girl. Will Alyosha be able to complete her most difficult mission yet?

Poor, in debt, and living on instant noodles, high school kendo instructor Kojiro makes a bet with an old friend on a practice meet between the all-girls’ teams of their respective schools. The prize: a year’s worth of free sushi! It’s too good for the desperate Kojiro to pass up! But with only one active member on the kendo team, Korjio must move quickly to put together a squad before the meet. He’s got his eye on Tamaki, the daughter of a kendo master and a skilled swordswoman herself. The only trouble is…she’s not interested. Kojiro’s willing to try anything, but what will it take to win her over?

Loner high school student Moribe Kyouya thought he was lucky to have the beautiful and mysterious new transfer student Baroque talk to him. The next thing he knows, he receives a love letter calling him to the roof, but the confession isn't exactly what he expected...

Nako is a poverty-stricken 21 year-old in desperate need of a job. She applies for a job at a jewelry store. When shop owner Ren identifies herself as a lesbian, the competition for the position evaporates, leaving only Nako. Ren asks her if her sexual orientation will be a problem, Nako sensibly replies that she's not interested, so she doesn't see any problem.

Atori has an unusual part-time job... she’s a demon hunter! After school, she hunts demons for a mysterious organization named N.U.E. To kill her enemies, she unsheathes the saber hidden within her hair. However, Atori is actually half-demon, but she has forgotten her past. Despite this, she's been able to overcome many difficulties as well as befriend those from both species. Unfortunately, her once calm life is beginning to quake as a terrible shadow now looms over her...

From MangaHelpers:
It's fairly obvious to Terui Chiaki that her classmate Ajikawa Yoshio has a crush on her. He is completely not boyfriend material in her eyes and, even if he was, Chiaki already has a boyfriend. Their mysterious teacher Mr. Yamada sees this relationship between the two students and offers an experiment. He is able to make copies of people and objects and does so with Chiaki, creating a copy of her, except the copy has no knowledge of her boyfriend. Yoshio will hit on the Chiaki copy, who is named Koaki, and he'll try to make her fall in love with him. After a specified amount of time, the copy and original will be combined back together and which ever love is stronger between the current boyfriend and Yoshio will overwrite all other emotions. So this love experiment begins and both Chiaki and Koaki, being the same person, thinks Yoshio has no chance in hell but with each passing day, some feelings begin to bubble.

Late one night when Jun was out on his bike, he came across a drunk, half-naked girl sprawled on the side of the road. She came to just enough to be uncomfortably affectionate, but Jun took her to his home to sleep it off with gentlemanly discretion. It turns out that she is Kawase Narumi, his author mother's new assistant. Unfortunately, she has no idea what she's doing in her new job, so Jun's going to have to coach her. He's also going to have to deal with her habit of getting drunk, mostly naked, and cuddly. Jun's life will never be the same! [From Baka-Updates]

Yona Ryouma, a normal high school boy, saves a man from another world at the cost of his own life when a mysterious earthquake occurs. The man, Emillio, uses a potion which apparently saves Ryouma's life. However, he is also changed into a girl in the process.

Emillio is actually the prince of this alternate world and he declares Ryouma as his wife, presumably on the context of saving his life. But what about Ryouma's life as a high school boy in his own world? And will he come to accept being the prince's wife?

When summer break ended, high-schooler Ichijou Hajime finds out that everyone in his class but him has gotten a girlfriend or a boyfriend! Hajime suddenly finds himself a loner but then Ninomiya Chitose transfers into his class...!?