In the Eniro Cinderella series:

Be my woman and I'll let you become a top singer! This is the speech made by famous music producer Yukihito Yoshizawa .Coincidentally, a female high-school student who wants to save her weak and sickly brother accept his terms by offering her voice and body. A passionate yet twisted entertainment love story thus begins!

From asdf scans:
In near future, mankind has been defeated by the viral parasites named "Gastrea." They have been exiled into a small territory and live in despair, side by side with terror. In this world trapped in darkness Rentaro, a boy living near Tokyo and a member of the "Civil Security"—an organization specializing in fighting against the Gastrea—is used to accomplishing dangerous tasks. His partner is Enju, a precocious young girl. They fight using their peculiar powers until one day, they receive a special assignment from the government. This top secret mission is to prevent the destruction of Tokyo. Set in a near future, this thrilling heroic-action story starts now.

From Dazzling Scans:

Matsuri had always been victimized and bullied because of her bright red hair. One day, two brothers, Natsume Fuuzou and Tsukuya, are hired to work at her family's bed and breakfast. It seems they have run away from home and are trying to earn their way in the world. However, there might be more to them that meets the eye... especially the strong, silent Tsukuya who manages to look past Matsuri's red hair and see her for who she really is.

From etc:
Ran's dream is to meet a prince, one of those you see in fairy tales. After several years Ukyo is back... to become her prince? With Ran living in her own fairy tale world and Ukyo not able to express his feelings and thus bullying her, how will this couple work?

The English male Mev and the Korean female Penguin who had met through an online messenger are enjoying their successful marriage in England for three years, after a lovely honeymoon in Korea. The story of these two, who overcome whatever cultural obstacles they may face with love and affection, are sure to put a smile on anyone’s face.

*Note: The comics are actually based off of the author's married life with her husband Mev.

The summer vacation...with a teacher in a vacant classroom. It is a sweet painful love affair that a girl often (o rly?) experiences. This is the sixth issue of the best-selling Cheese selection. Nine other stories are included besides the title story written by Sugi Emiko.

From Batoto:

Masumasu Academy, an Academic City floating in the Pacific, is home to children with mysterious powers known as "Fiction". "Fiction" grants them enhanced physical prowess, as well as one additional ability. What will happen when a time stopper, Kazuma, meets a cute girl with the ability to move at lightspeed, who knows and is searching for him?

From Jcafe24: Corpse Party: Blood Covered is about a group of high school friends in Kisaragi Academy. Kisaragi Academy was built on the grounds of Tenjin Elementary School, which was demolished after a string of disappearances and gruesome murders. After a mysterious earthquake, the students find themselves trapped in an alternate reality Tenjin Elementary School, where the murders of others trapped before them have continued unabated...

Momiji knits a sweater for her friend, Yunobe, who's going to be in the school's Christmas fashion show.

From MangaHelpers:
This is a story of a group of college-age people who struggle with gender and sexual identity.
Yuki (nicknamed Yoshiki) is a girl, but she is terrible at 'being feminine.' She mostly dresses like a boy and is often mistaken as one. However, she has to wear a skirt and imagine being dominated by a guy in order to masturbate. Nagao Mikako seems young and innocent, and she uses that apparent innocence to sell her body as a fake 15-year-old. She knows her youthfulness can't last forever, but she enjoys tricking the men. Her friends have no idea of her sexual habits and believe her to be sweet and sheltered. Aiba Kaito is a pretty good-looking guy, but he wants to be Nagao Mikako. He often dresses as a girl, picking out clothes that mimic Mikako's style. Though he's into cross-dressing, he is still attracted to women. Will these young adults and their friends be able to handle their 'guilty secrets' and muddle their way through this confusing period of their lives?

When humanity was threatened 5 years ago, the boy who saved the world was driven to despair and became regarded as the enemy of all of mankind. And now a new crisis approaches humanity. The curtain rises on a gallant drama about a hero falsely charged.

Lin is just an ordinary high school student. But on the day she transfers to a new school, she gets a video game, which sends her to the world of King Arthur. There, she meets a mysterious wizard, who tells her that her mission is to find and gather the Knights of the Round Table and find the Holy Grail.

N/A

From Asclepias Scans:

Park Min Gyeom is a human with a disease that makes him produce excess blood. Kim Chun Sam is a half-vampire who needs blood to live. So begins an unusual symbiotic relationship between "predator" and "prey."

Note: This series contains additional (optional) 18+ scenes.

After jumping into the sea during a cruise, Fukamachi Wataru, the famous musician, lands on an Hoshi Island, a place inhabited by folklore people. There he meets Himukai Antsu, a girl gifted in the arts of singing and dancing. With her, he is able to find his calling again, and once more create music. What he wants is to take her to Tokyo so that she can share her gift with the world.

From Hoshikuzuu Scans:

The story of a young owner of a long-standing small eatery and a puppy-like laborer.

Kota attaches himself like a puppy to Makoto, who has been like a fatherly figure to him. Even after they have grown up, he still smiles and proclaims proudly that “Mako-san’s food tastes just like a mother’s does!”

The two get along as well as a family, but one day, a customer arrives who becomes a thorn in Kota’s side. The two appear friendly and Makoto shows expressions that Kota has never seen him make. And he acts differently than normal… Kota is then plagued with a dislike and worry that he can’t shake off.

Moe confesses to Yuuka who rejects her harshly in a haughty manner different from her usual "good girl" personality... but Moe seemed to enjoy it?

The series is composed of four protagonists.

Nori: An energetic, upbeat girl who was heartbroken sometime ago due to her childhood friend. Now she is headed to meet Haruna, the lonely kid she always played with back then, but to her big surprised grew up into a hunk.

Kyou: The school's prince. From a distinguished family: he is handsome, smart, athletic and rich. He has never struggled for anything in his life, be it money or women. Haruna's sudden return throws him off momentum.

Saeka: She, Nori and Kyou are childhood friends. She is mature, composed and understands the two quite well. Although beautiful, she has been in love with her teacher since middle school and therefore never gone out with anyone. Will her feelings be answered or will she find an unexpected love around the corner!?

Haruna: The boy who comes back after having been away for many years. His reason for returning is unknown. The guy who’s clouded with mystery shows interest in Nori. Does he really like her or is there something else behind it...

Summary: Nori Sakurada is riding her bike one day, when she meets up with a boy she used to know when she was little. He has grown, but doesn't look very happy...

Also contains a side story called Himitsu no
H-kun in vol.1:
The well-known and popular Hakozaki-kun is the dream of every girl in Miwako’s school. However, he's hiding a secret! One day while walking down the street, Miwako notices him secretly taking photos of elementary schoolers!! Could it be that the famous Hakozaki-kun is actually… a… a pervert?!

The continent of Yggdra is a place where humans, ogres, giants, forest sprites, and many more mythical creatures live. Led by the Holy King, the continent was at peace until one day, a mysterious group called the Black Army appeared and started conquering the land. In response, the Holy King and its troops fought against it, but Holy Capital fell and the Holy King was killed by the mysterious Black King. As the continent was in the glimpse of destruction, hope glimmered as one man, Yuri, the Hero, decided to fight back and formed the Volunteer Army to oppose the Black King and bring peace back to Yggdra.

As working woman and plant fanatic Sayaka Kōno was heading home from a drinking party, she found a handsome man sitting in front of her apartment who says, "Please bring me home with you," like a dog. With no place for the unnamed man to go, the two begin living together, and their "delicious" love story begins.