Yuta, a ronin student, moves to Tokyo with hopes to enter university. With no money, he moves into a share house filled with beautiful women.

Kodai lost his younger sister in "Noah's Flood", a catastrophic event that submerged Tokyo not too long ago. He confines himself to what's left of his old life, refusing to move on. One day, a mysterious girl who calls herself "Kururi" jumps out from the endless sea, claiming that Kodai's "home" actually belongs to her. After a brief chase from some mafia-type group, Kururi forces herself into Kodai's life as his new roommate. Because of this, Kodai is forced to start moving on from his tragic loss and both of them have to learn to adjust to the new way of life that "Noah's Day" forced everybody to live.

Little Busters! revolves around Riki Naoe, a young male high school student. When Riki was a child, his parents died, leaving him hopeless and depressed. What saved him was a group of his friends who referred to themselves as the Little Busters; they took Riki out and played together with him during his time of need. He really enjoyed playing with them, and his grief gradually faded away. When the story begins, they are in their second year of the high school they attend. They still hang out together, and enjoy their school life.

From MangaHelpers:

No one can make the perfect decision every time. Everyone has those moments that they wish they could redo and alter their decision. This story revolves around girls that got their second chance. [DrCoke]

Sayama Junichirou is an ordinary student who wishes for some action in his life. When he come home one day, he is held hostage by the famous bank robber, Kazuha.

Kaoru is a 17-year-old virgin who has an SM fetish. He secretly dreams about an SM relationship with his childhood friend Nana. One day Kaoru's mom asks Nana to hide all his SM toys so he'll study for a change. However, Nana finds the leather one-piece that Kaoru bought and tries it on, but she accidentally locks it and doesn't have the key! The beginning of their super strange relationship.

When Hideto, a high-school student who is afraid of women, is suddenly targeted by a beautiful older woman whom he believes to be a molester, he runs for his life. Mid-pursuit, he is attacked by what he previously believed to be an illusion, a blur that nobody else could see.

Boys who can't love and girls who don't want to. What will happen when two people who are like this meet? If two people like this do find love, how will the world change?

This manga is based on a adult erogame. The main male character is Asaba Yuma, and the story follows the school life he shares with many girls and his one male friend. These girls include Tsukishima Yuri and her twin sister Hanako, who is in the newspaper club, Yuma's little sister Konami, who likes shogi, and several others. Will Yuma find love in his teenage years? [tethysdust]

From Vampire Knights:
Alice is the heiress to the famed Han Gan clan. She returns to Korea to search for a husband who can then lead the clan, and has her hands full with competitive suitors, each fighting for the coveted position more than for Alice herself. What they don't know, however, is Alice's true motive...

Shou, the older brother, and Saya, the litlle sister, only have each other. The two of them lived happily, enjoying their peaceful lives together. That is, until Saya was bitten.

When bitten by a pure-blooded vampire, the one who was bitten may themself become a vampire, as was the case with Saya. She can't leave the house out of fear that she will feast, and her brother must lock her away to protect her from vampire hunters, such as himself. The only solace she has is being taken care of by her beloved older brother, whom she knows has eyes only for her, and vice-versa.

And so, Shou has made it his goal to kill the pure-blooded vampire who bit his sister, believing that in doing so he may restore his sister to what she once was, and becomes an expert for that. But since Saya was bitten, she has become increasingly obsessed and forceful. She can't stand being mere siblings anymore, and Shou is having a hard time holding back.

Will Shou give in? Or will he kill the pure-blooded vampire first? And even if he does, will that be enough to stop the romance forming between the two of them?

Tokyo Yamanote Boys is a confession tournament held in Tokyo. This year Chihiro is chosen to be the princess, which means that she gets to spend a fateful dreamlike week with the boys. (adapted from koiiro.wordpress)

A boy loses his parents in a supernatural disaster known as a "Curse" and is then adopted by the Tsuchimikado family; a family that exorcises curses. Ten years later and the boy has become the head of the family and now goes about exorcising curses all the while trying to balance his job as an exorcist and his life as a student in high school.

The protagonist, Houkou Hayao decides to take a job interview at a family resto, Berry's, in order finds out what to do when he graduates.

On the same day as the interview, he bumps into a certain "ojou" who just got out from the interview room in a bad mood, and binge eats at Berry's. He later ended up hanging around with her. When he gets home, he finds out that Yuuka, his "imouto," has found out that he got a job without her permission.

Later, he learns that the binge-eating girl which introduces herself as Morikubo Yuna he met is a new employee like him.

Shuuya Inukai is a model student at a high school who one day attracts the attentions of an ojou-sama, Kantori Isuzu, when she realizes that he is bearing, on his forehead, an X-shaped scar...that was also present on her pet dog's forehead...which leads her believe that Shuuya is actually the reincarnation of the said animal. And now Shuuya's days as Isuzu's pet begin.

Poor Yuzu is an orphan who's too clumsy to hold a job. She's reduced to living in a playground -- until a handsome stranger named Hassaku informs her that she's heir to a fortune, and whisks her into a world of wealth, power, and more hot suitors than she can shake a scepter at! But there's a catch: Hassaku must turn this klutz into a lady of refinement, or Yuzu will lose everything!

Also included in this manga is an extra story called Naughty Honey:
"The boyfriend I made in college cheated on me."

When she caught her boyfriend sleeping with another woman, Kayako Ueno broke his front teeth... and it will cost her a hundred-thousand yen to repair them. So she takes a part-time job as a home tutor-- for playboy Haru-kun.

The world as we know it was suddenly altered forever when the door for the dimension of the gods and the door of the dimension of the demons suddenly opened up. Ten years later, a boy named Tsuchimi Rin was entrusted with two princesses from those dimensions. Will he be able to keep his sanity while living with his childhood friend Kaede, trying to live a normal school life, and also being a neighbor to both of princesses and their fathers, the mighty dimension Lords? The hearts of those girls are at stake and only Rin has the key to unlock them.

Group of soldiers fighting against aliens after the conquest of the planet Earth.

Having a light novel author father and an eroge illustrator mother, Kanou Shinichi is a thoroughbred otaku. However he does not have any special power except for his broad knowledge, sharp insight, and impeccable instinct about "moe" and its products, from manga to anime to games to light novel to figures. One day he found himself transported to a fantasy world where elves live and dragons fly. And he is given a task—not to fight monster or embark on a quest, but to enhance cultural exchange by becoming a "moe missionary" in this fantasy world! He meets a palace guard who has a bit of fujoshi taste, a half-elf maid, and the empress who is a little girl. He comes up with the idea of building a school. At first it runs as a comedy but later there are serious matters that Shinichi needs to face: ethnic discrimination, social problems, conflict with neighboring countries, sabotage by opposition elements including Japanese government and the likes. Can he overcome the obstacles, successfully bring "moe" culture to the fantasy world, and help the people there as well?

Akira Toudou is eager to put his past behind him and start his new life in a new apartment. With key in hand, he discovers that his new bachelor pad has been double-booked and like it or not, he’s going to have to take on a roommate. Not just any roommate though, but busty, free-spirited, adult manga artist Hina Kamiyama. Akira is going to have his hands more than full fending off his nosy boss and Hina’s entourage of randy artist friends as he tries to get his life back on track.

Taken from the Infinity Studios LLC website:

How do you distinguish between the love from a cute neighborhood girl (who’s like a little sister to you), and the love from the hottest, yet quirky, girl in school? This is exactly the question Myung-Ho has to ponder when both his neighbor’s cute little daughter, Ji-Hae, and his school’s most popular diva, Yu-Ri, make him their valentines. Of course he cares for Ji-Hae, because the poor girl’s already been through so much for someone her age, but still, she’s only just a kid. Then there’s Yu-Ri, the girl of his dreams…or rather, she would be if she wasn’t a fortune-telling voodoo witch doctor. Oh and yes, it would also help if her father, the local gangster boss, wasn’t out to kill him.

When you’re as lucky as Myung-Ho is(?) choices are very hard to make. On one hand, he could go out with Yu-Ri by turning down Ji-Hae, breaking the heart of a child who’s been depending on him ever since she moved in next door. Or, he could choose Ji-Hae by turning down the only chance at romance with a beautiful girl dead set on making him her destined love. Choices, choices…