From MangaHelpers:

The water polo team at Kamakurahama High School has a new ace player, Torii Ushio, who you wouldn’t expect to be a star athlete if you knew her in the classroom. Nakaoka Riku always took her as a shy person but after seeing what she can do in the water and how fast she can swim, he couldn’t deny that she deserved to lead the team. But late one day after practice, Riku finds out that Ushio has some secrets she has been keeping from everyone. Her family runs a temple and Ushio is the priestess to the dragon god. The descendent of the original dragon god is Sango who is a teenage girl who is the same age as Ushio. She lives in a secret underwater cave and her only friend is Ushio whose role is protector and companion. Through a series of events, Sango joins the water polo team to be close to Ushio and amazes the team with her out of this world swimming ability. [vyc]

Minami is cursed. Every time a guy she likes gets close to her she starts to feel bad and sometimes even throws up. She knows that she is cursed because of a nightmare that she keeps on having about a girl who’s asking her to “give him back”. “Give who back?” Minami asks herself. In the end, her only lead brings her to Kouki, her ex-boyfriend. The nightmares have started after they broke up.

1) Houkago wa Koi no Yokan
Sarara has been going out with her first boyfriend for over a week but they haven't progressed past going home from school together. Kawatori is a year younger, tall and cute, a little weird and quiet, but she knows that he's a very kind person and loves his sweet smell. She adores sweets and cakes, and regularly visits her favourite cake shop, however Kawatori says that he doesn't even like cakes! With Christmas approaching and Kawatori saying that he's too busy to see her, is Sarara right in thinking that he's not really interested in her and is already cheating? What's he being so secretive about? Will they ever be able to have the sweet Christmas together of her dreams?

2) Yuuwaku Danjon
Natsumi has been by Ryo-kun's side for years and still didn't confess her feellings. He's an year younger than her and tries to get to Keiou university, tall, cute and a bit unsocial. When she brags about him to her friends everything goes wrong. Will they ever be together?

3) Yozora ni Kiss
Hitomi is the leader of the culture festival committee. Since she is transferring, she wants to do something special for the last time. Matsunaga-kun, the chairman, helps her planning. Hitomi has feelings for him, but she isn't brave enough to tell him. She sticks with making memories of him, but what happens when he doesn't want her to transfer....

4) Powder Snow ni Kiss

5) Tokimeki no Private School

From JShoujo Scans:

Falling in love with him was her biggest mistake... After being badly bullied in junior high, Kazu's sworn off getting deeply involved with other people. One day though, the resident class playboy, Kirishima, comes and tears down the walls she's built around her heart. She finds herself falling quick and hard...but is she only setting herself up for heartbreak?!

Volume 02 contains the oneshot "Key Point"

Fictitious Joseon - the love story of those who have the pain of the world

Orginal webcomic

The meeting of Haruto, who dreams of being a singer-songwriter, with Akira, sparked by a traffic accident—?!

When Haruto, a lonely singer who never sings, suddenly becomes able to see ghosts, he meets Akira, a ghost with the skin of organdy. Apprehension turns to friendship, and friendship turns to…?

A little note: this is not Oku-sama wa Joshi Kosei/My Wife is a High School Girl. This is a different manga with a different author.

What to do when you're a young Asian immigrant, living in a European slum, with no choice but to hit rock-bottom?

On the usual menu, blackmailing, theft, prostitution…until one day, enough is enough. But the mafia won’t stand for that!

Narrowly escaping the people who wanted him dead, Maoye is then picked up by a bizarre old woman. Taken care of in her hut filled with killer bees, he must listen to the strange stories she tells him every day. A story of wild young kids, even wilder and younger than him. They're on the run as well...but ready to do anything to find love and peace, no matter the price!

Girls in our family have a secret, and it's only lifted after child-birth. The beautiful Zi Wen has this secret, and through thick and thin she cannot tell anyone, not even her best friends. If they knew her secret ... ah - she doesn't even want to think about it! If Wu Nan and Rui Ling knew she wasn't really a "she", would they even want her friendship?

From Hoshikuzuu Scans:

Adorable-looking model, Kubota Rei, hides a dark secret...And that is a strangulation kink and getting off on seeing the marks. But one day, all of this is revealed to the tabloids by an ex-girlfriend claiming domestic violence. Although he is deeply regretful that it happened, he does not change his behavior. His manager decides that if he can't stop it, might as well find an outlet. So he hires Miyoshi, a prostitute who is okay with any type of play. When they first meet, upon seeing Miyoshi's pale skin and hair, immediately falls for him...

Included in this volume is also a story on infidelity and love triangles. "Yurete, Fureru Made": A bitter tale about adults.

The people have demanded change; Criterion boxes were created for the purpose of the people to leave their complaints in it. The result of this were two changes: the first being the creation of 'Koishigawa Youjoujo' for the people, the second being an inner-city magistrate office, known as the Mushibugyo.

Tsukishima Jinbee is a warrior who aims to be best, under the belief that a weak warrior isn't a warrior at all. He was scouted out by a representative to join the Mushibugyo and told to go to Edo with the instructions that he'd knew what to do once he got there. Shortly after arriving at Edo, he hears a scream and goes to check it out only to find a giant spider-like creature devouring some citizens of Edo. Being a warrior, there's no way he could stand this...

from fictiondb:
"Morgan's coming home!" her stepfather cried

Those three words should have released a flood of warm memories for Leigh. Instead, thoughts of their last disastrous encounter blotted out the rest.

Just when she'd been coming to terms with her awakening feelings, Morgan had seemed intent on resisting the passion that flowed between them.

"Why must it be you of all women who tempts me almost beyond endurance?" he'd said. Why couldn't he see that she was nothing like her mother? And why was the thought of seeing him again casting her world into turmoil...?

Shiro Masakatsu is a boy people can't stand to touch, whether they be male or female. One day, he sees a girl with a weird katana finishing a fight with someone, so naturally, he ran away. He later meets the same girl at school, and another katana-wielder picking a fight with her. But it turns out these katanas have abilities, called Youtou, making them cursed katanas; but to use their Youtou, a certain condition has to be met...

From SugarManga:
Couple rings...you exchange it with the one you love. What happens when your ring is with the one who loves you, and not the one you love? Mika was rejected by the one she loves when she confessed and her ring ends up with Keigo. What will happen between them and who will she end up with?? The one she loves or the one who loves her?

The calm, composed and shrewd restaurant owner, Hatakeyama, is in love with Yamasaki, the cool, beautiful chef from a rival restaurant. In the past, Hatakeyama tried to embrace him and Yamasaki hates him for it. Despite this, Hatakeyama refuses to give up and aims to start again as friends. Although Hatakeyama often asks him out to eat, Yamasaki still doesn't show any interest in him... but what happens when a cool, good-looking fellow chef appears?

The title story, “The Mermaid Prince,” told in three chapters, is a coming-of-age story set in Okinawa. The boy, Mugi, has a fascination with mermaids. He moved in from Tokyo when his sister got married to a local man, and doesn’t quite fit in. On the day he met the girl, Madori, she was just coming to terms with her new family situation. His thoughtful gesture made her view him as her Prince Charming.

In the second story, “Snowy Day,” a homeless father and son take refuge from the snow in a library. The librarian soon finds out there is more to them than meets the eye.

The third story, “Ametsukigahara,” is a two-parter about a girl named Akari. There’s not much she cares about in this world, except maybe her friendship with Fumika, who’s afraid of boys. But then Fumika gets a boyfriend, and something happens that makes Akari even more jaded than she already was.

An anthology manga containing 8 short stories based around the theme "ZQN" (From "I Am a Hero") 

The world is a cruel and confusing place for Mayumi. At the age of thirteen she lost her parents in a car accident. Unable to deal with the overwhelming sadness, hatred, and anger, she only wished she could stop feeling altogether. Then, five years later, her sister becomes the first target of an incredibly bizarre incident. The victims in this incident lose a body part, without blood loss, after receiving a text message simply indicating the specific body part. The texts appear to come from Mayumi's sister's ex-boyfriend Kanno, but he claims to not be the culprit. Mayumi works with him to solve the case, but is he truly innocent? Or is the crime related in some convoluted way to the suicide of Kanno's fiance years ago? Or is it related to an unfinished AI program he was writing which may have broken free? And even if this incident is resolved, will Mayumi ever be able to truly heal emotionally amidst the pointless cruelty of the world?