Civil engineering student and reknowned bridge otaku Youichi helps a swan stuck on the scaffolding for a bridge under construction, only to be visited that night by Miwa, a beautiful woman claiming to be the same swan Youichi rescued. Miwa stays with Youichi in order to pay back her debt, but he is, understandably, less than convinced that she is what she says she is. But, Youichi not being one to look a gift swan in the beak, or more importantly not one to leave a woman in need hanging, things soon develop in the way you might imagine.
(Then again, maybe not exactly like you imagine...)

My boyfriend transformed into me…

Side story of Get Backers created two years after the conclusion of the main series.

Shy freshman college student Rikiya knows he likes guys, but has never been in a relationship, only able to look on without expressing his feelings. Living on his own for the first time he decides to try and change his life and joins a gay dating site. Everything seems perfect until he finds himself about to be attacked with nowhere to turn yet desperately hoping for help, when a guy crawls through the wall and says, "There's no helping it. What's your wish?"

Sagimiya Makage is new to an all girls school and doesn't feel like she will fit in. However at the entrance ceremony, someone even more weird in the school introduces herself as an actual witch doctor who is employed to help with the schools curse.

Shrugging it off, later Makage makes a good friend at the dorms who won't wake up from the curse! How will Makage help her friend, and what is the secret behind this curse anyway?

A happy fox god is excited that a guy she liked has come back to her. Then she realizes how much time has passed, and her suffering begins!

Cute vampire guy meets hot bara priest. Anymore than this would be a spoiler. It's only 8 pages so why not read it.

Included in the anthology Nikutaiha Gachi!.

In this comedic supernatural romance, Mari's long-awaited lovely single life in Tokyo is interrupted by a ghost with a grudge.

Ishikura is the manager of an event company. Izumi is a worker from a plant maintenance company that services Ishikura's firm. Ishikura does not have a good impression of the blunt Izumi yet for some reason, he could not resist him.

What would blossom between the twice-divorced Ishikura and green-thumb Izumi?

From Batoto:

The unstoppable force meets the immovable object! The world's brattiest princess is engaged to a prince just as childish. Will they figure out who's the worse brat before one or both are assassinated by political rivals? Read on!

Tsugawa Tatsuya just lost his parents in an accident... but he's trying not to let that keep him too down as he starts high school.

While trying to obey his father's final wish for him to become an upstanding man, he ends up helping a girl who was being bullied. Despite her exceedingly cold nature, he just can't leave her alone... which may not necessarily be to his benefit, as he ends up getting wrapped up in a world where things like parasitic mind-controlling bugs exist...

From Anime Waves:
Rena Misaki was a normal girl in high school in the small town of Otogi. But lately she is being tormented by Kegari Chota (little hamster like imps that cause greatly increased sexual desire). They had been banished from the village long ago by a priest. But somehow they have returned and have taken an interest in Rena. And if that wasn't enough trouble, they are starting to spread. Rena has to find away to get rid of them and have a normal life, before she ends up sleeping with all the guys around her.

Mitama Kamishiro is an athletic junior high school girl with a strong sense of justice who has dreamed of becoming a crime avenger since she was little.
A mysterious shopping district, “Yaoyorozu Shopping District,” suddenly appears in front of the silly yet righteous Mitama, who “wants to save humanity from its inevitable downfall.” When Mitama goes to the shopping district that seems to be calling out to her, she is faced with. This is a Shinto-inspired comedy about a silly, righteous high school girl and some bizarre Gods. Hurry up and pray!

From Viz:
At first glance, Nina Sakura seems like a typical teenage girl. However, she's actually a transfer student from a witch school! Now enrolled in a Japanese middle school, Nina is hoping to improve her grades, make some friends, and practice love spells on her unsuspecting new classmates.

Shy Ayu Tateishi has just made a new friend at school. But this new friend, much to her surprise, is no ordinary classmate. Nina Sakura may look like a normal middle school girl, but she's got a big secret.
She's a witch.
Or, rather, she's studying to be a witch. And apparently, she's not doing her homework. Her spells are devastating in their ineffectiveness and often result in the most embarrassing situations for poor Ayu.
But things wouldn't be so bad if Nina's sorcery didn't make Ayu look silly in front of the one boy she secretly adores. All she wants is a simple love potion. What she gets, however, is a new best friend who almost flunked out of witch school!

From Viz:
All high school freshman Airi Hoshina ever wanted was to someday live in a cozy home with a loving husband, and find joy in the little things in life. As a result, she makes it her daily mission to get to school on time because school legend has it that the longer one's non-tardy streak is, the better boyfriend one will find. But just when her daily routine is working like clockwork, an occurrence of fairytale proportions threatens to disrupt her grand plan.

Yusuke Urameshi was a tough teen delinquent until one selfless act changed his life... by ending it. When he died saving a little kid from a speeding car, the afterlife didn't know what to do with him, so it gave him a second chance at life. Now, Yusuke is a ghost with a mission, performing good deeds at the behest of Botan, the ferrywoman of the River Styx, and Koenma, the pacifier-sucking judge of the dead.

Note: Won the Shogakukan Manga Award for shounen in 1993.

Vowing never to separate from his childhood friend Hisame, Itsuki travels on the Tokaido with him in search of new adventures. Exterminating youkai along the way, they depend on each other to finish the job. What adventures lie in wait for our two protagonists?Sequel:> Toukaidou HISAME -Kagerou- ( http://mangapark.com/search?q=toukaidou-hisame-kagerou )

Noragami Special,tells the story of the encounter between Yato and Magatsukami Rabou.> Spin-off of Noragami( http://www.batoto.net/comic/_/comics/noragami-r5014 )

From 1st Chapter:

The lead character is a naive boy who's fallen in love with an older girl who everyone considers a genius writer. He's so in love in fact, that he has forgotten for the last 2 months about his secret hobby. For the past 10 years he has been writing the "character profile" of a single girl. Her birth date, personality, hobbies, conversations, etc.... is all recorded in a large pile of notebooks. All this time this fictional girl has been his friend and lover, but now that he is in love with a real girl he decided to throw them all away.

In order to "purify" the notebooks, he decided to burn them at a nearby shrine. To his surprise, the senpai he's in love with was also there. It starts to rain and as they talk the girl confesses she's having trouble writing her novel due to inexperience. As the storm gets even stronger, the lead character believes that since she confessed her "weakness" to him it is OK for him to show her his own "secret". Filled with courage, the boy opens the bag where he brought all the notebooks... except that instead of notebooks, the bag now contains the girl (naked of course) he's been creating for the past 10 years!!

Mayama Haruki and Himemiya Tsukiko have been childhood friends and neighbors for as long as they can remember, but after a girls-only meeting in fourth grade, Himemiya distanced herself from Mayama. Now in their 2nd year of middle school, Mayama has become an ero-freak who specializes in harassing Himemiya. Determined to unravel the greatest secret of girls, what happens on "that day", Mayama follows Himemiya and uncovers.