From MangaHelpers:

Shinomiya Ryouma is working frantically to raise a billion yen for his sister's medical bills, while going to high school. One day, a mysterious woman asks him, "Would you put your life on the line for what you desire?" After receiving a ticket from her, he gets caught up in a fatal accident. When he wakes up, he finds he's turned into a girl and what's more, he's participating in a "game" where a win means he can reverse his fate but a loss means he'll die instantly.

Han-yi suffers an accident and in order to save her life, they use the body of a fresh brain-dead patient...

The Culture Research Club of Yamahoshi Academy. The strange events that befall the five boys and girls there, causing their bodies and souls to be swapped around at random. What can be seen from the viewpoint of the others?

Han Sae Bik, who has a beautiful singing voice, wishes to be a famous singer in South Korea. She moves to Seoul along with her family in order to fulfill her dream. However, she fails in all 48 singing auditions not because of her talent but her unconventional style.

Her family, especially her grandfather, is strongly opposed to her dream, forbidding her from becoming a singer because of the thought that it's not a proper job for a person born into a traditional house. When Sae Bik falls asleep in a hairdresser's, she gets her hair cut just like a handsome boy. She participates in a singing contest in order to earn money for a wig. She is mistaken to be a boy and wins the contest. An entertainment agency notices her and asks her to be in a boy band with other 4 members. The story now begins.

Mei Sengoku is an independent girl and captain of her high school kendo club who enjoys helping others in need. This has earned her a lot of admirers among the girls at her school, as well as a guy named Shirou Fuji well-known at school for his girly way of speaking and gestures. When Shirou asks Mei to go out with him, she simply rejects him, but he comes back the next day and tells her he's not going to give up on her so easily.

Nao, a university student who lives with his childhood otaku friend, Subaru. Upon receiving rejections of hanging out with his female friends, Nao decided to pick up girls instead. Charmed by her smile, he succeeded. Only exception was that the girl he dated for a day, Azusa, turned out to be a guy. Their relationship progressed smoothly until Subaru stepped in. How will their relationship continue?

The heroes of the three kingdoms' war have been reincorporated in high school girls! Loyalty and hostility concern love in this world...? Wei, Wu, Shu, during the Three Kingdoms period they were warriors who fell in the mind and fell down in the chest... But what do they do in Japan?!

A comedy about two boys who switch bodies with two of the girls in their class.

Yuji Mase, a university student who is rather popular with girls without his knowledge, taciturn and withdrawn type. In fact, he hides a secret wound that will be revealed during the visit of his sister hairdresser-stylist: he does not feel at ease in this body of a man that he's in ...

A legend says that the ghost of a girl stands on the top of an old Catholic church, inhabited by the Sagimiya family. Said family has a hateful rivalry with the Bijogi family, who manage a Taoist temple next door. In the middle of all this, Bijogi Taiga has had a crush on Sagimiya Anna, the demure daughter of the priest, since childhood.

Little did he know, the Sagimiya are involved in very un-Catholic activities such as trying to resurrect the spirit of Marie-Thérèse Charlotte, the food-obsessed daughter of the late French queen Marie Antoinette. And since he has found out, he will have to "collaborate" − i.e. be the human sacrifice to that end. Nevertheless, just before the "ritual," Taiga decides to confess his love to Anna and is struck by a lightning bolt the second after. He miraculously survives without a scratch, but somehow finds himself in a body slightly more... blonde and feminine.

A high-school boy named Manaka Hiromi is given the magical power of the Red Garnet Princess to defeat the Devil King who is trying to escape Hell (or something like that). Unfortunately for him he's also given the sort of body that comes with the job description.

Seong Yeol is a vampire scholar that has been hiding from people for many years, letting them believe that he is an old man with leprosy. The only person he lets enter his place is a smart bookseller, Yang Sun. Together they will try to fight against a conspiracy.

Two young men find themselves in a compromising situation when their tyrannical mothers set them up for an arranged marriage. Things get really complicated when the bridegroom's older brother falls head over heels for the cross-dressing bride and an unusual love(?) triangle forms.

By aquamarinep:
The world has became a place dominated by males. Women are virtually extinct with their number-count in the hundreds and the youngest of the them in her forties. It has been long accepted that a wife, being a gender so rare, can have multiple husbands. Sex change to satisfy sexual desire is a growing phenomenon, although is still looked down upon by society.
In such a disordered place where she is the only girl, Ho Su awakens.

From: Kisu KMS
Yoshida Kazuki is your average office worker who is a virgin. On a faithful day during a meeting with his boss, he meets a girl named Futaba, a very cute and lovable girl, and they end up going out together. However she has a big secret: she is a hermaphrodite.

A collection of seven short stories centering around romance and family:

1. Chichi to Musuko to Buridaikon (The Father, the Son and the Yellowtail Radish)
Micha, formerly Hamada Mitsuru, is gay, in a loving relationship and living as a transvestite in Tokyo. Having kept this a secret from family what high jinx will follow when Micha's father turns up unannounced?

2. Machibito Kitari (New Year's Fortune: Waiting for the One)
A chance meeting of two strangers at a train station on New Year's Eve...

3. Musume no Toshigoro no Musume

4. Torikahebaya de Aimashou

5. Genshoku Megane Danshi Hyouhoni (The Male Specimen with Eye-catching Glasses)

6. Katakoi no Nikki Shoujo (The Girl in the Diary of Unrequited Love)
Takashi accidentally found his father's diary and in it, it tells a story of his father's love for a girl with green flower hair pin. So who is this girl? What's Takashi going to do about it? Read it to find out the bittersweet story of an unrequited love.

Gen Shiomi, the 56-year-old boss of the Hitotsubashi mob syndicate, must go into hiding to protect his life from potential assassins. He opts to get plastic surgery, only to end up looking like a teenage girl, but he resolves to stay like this until his life is no longer in danger. However, he finds it hard to not be suspicious, but he is saved from being the target of police by a teenage boy named Tatsuya Umemiya. After helping Tatsuya out of some troubles of his own, Gen is forced to enroll into junior high school as "Shiomi Iwao", only to discover that one of his new classmates is Tatsuya.

15 year old girl is a newbie idol in love with her best friend’s brother who is also a popular idol. But she runs into a scary yakuza guy and finds out her mother was an ex-magical girl, the yakuza was her mascot. Her love interest gets kidnapped by demons that look like burly men with cute squirrel heads. So she contracts the yakuza to become a magical girl, which in this story means she turns into a handsome guy in a magical girl outfit. And her love interest shows an attraction towards her magical guy form? But her best friend (her love interest’s sister) turns out to be in love with her and later also becomes a magical crossdressing guy to save her life.

David and Marlo are a newly wed couple looking for a new place to live. However, they aren’t your ordinary couple—David is a vampire and Marlo is a man that transforms into a woman during the full moon! They come to the town of Reto, which is home to only supernatural beings like themselves and magicians. Even though they like the town, they soon are caught up in trouble with some of the current residents. Another vampire doesn’t appreciate the perceived trespass on his feeding territory and sends his cute little girl magician to deal with the new problem.

New story of Princess Sapphire currently running in Tezucomi, an 18 month special magazine commemorating Osamu Tezuka for his 90th Birthday.