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This tale begins with Shino who was in love with a girl called Maruyama. Shino asked his best friend, Akira, to set him up with Maruyama, but instead Akira betrayed Shino. Depressed, Shino goes to spend the rest of his day binging on cakes at the Seijou Black Tea House which is run by two mental cases by names of Shuuji and Keisuke. Mix a magical tea leaf, homosexuals, and various other things for ensuing hilarity. (Source: Taruby's Paradox)

Just before they enter high school, the boys Meguru and Shou are whining about the fact that neither of them has a girlfriend. A strange, large-breasted woman shows up, claiming that she will fix their problem, and kisses Meguru. This odd occurrence is pushed out of the boys' minds when they meet up with Souko, a friend from elementary school, who is going to be in their high school. She's grown up into a pretty young girl, and it seems like the boys might have a shot with her! That evening, Meguru realizes that the strange kiss may have had more meaning than he thought: he's turned into a girl! He convinces Shou and his mother of his identity, but no one has any idea how to turn him back. Now he's going to have to learn how to be a girl and let go of his hope of dating his cute childhood friend Souko. What will happen to his hopes for a popular high school life? (Source: MangaHelpers)

With looks to die for, Saika Kuozaki is the most powerful mage in existence and the only one who can thwart the annihilation factors that attempt to destroy the world once every three hundred hours. When Saika is mortally wounded, however, she bequeaths both her powers and body to the normal high school boy who happens to find her, Mushiki Kuga. Just because Mushiki inherits her abilities, though, doesn't mean he can control them. To stand a chance of saving the world, Mushiki will have to attend an academy for mages as Saika—while trying to keep his true identity under wraps! (Source: Yen Press)

From Taruby: Our protagonist, Moji Shimeta, just so happens to fulfill the stereotype for being a worthless human. His inability to carry out a conversation has left him at the bottom of the barrel as far as friends are concerned. That Shimeta fell in love with the school idol Ishikawa Yuuko, however that kind of love is absolutely, perfectly, and completely impossible. During this time, the messenger of the gods, Osaki, appeared to grant Moji's request with a price attached concerning Moji's cooperation in catching some runaway evil spirits. However to catch them all, Osaki uses Moji as a vessel to become a servent of Uganomitamanokami (aka Inari) called Youko. Lots of Ecchi situations and humiliation abound at Moji's expense.

Twintails: the glory of all mankind—or at least that is what first-year high school student Souji Mitsuka believes. At school, Souji spends most of his time daydreaming and rating girls' twintails, even going as far as creating a club dedicated to the hairstyle. His obsession does not go unnoticed, however; when monsters from outer space attack Earth and claim the world's twintails for themselves, a strange woman named Twoearle enlists Souji to fight back using twintails of his own! By transforming into the twin-tailed warrior Tail Red, Souji combats the vicious alien organization known as Ultimegil, whose main goal is to colonize Earth and steal everyone's spiritual energy, or "attribute power." Alongside fellow twin-tailed fighters Aika Tsube and Erina Shindou, Souji must find a way to defeat the invading army and defend the twintails he holds so dear. [Written by MAL Rewrite]

His name is Terawaki Kyou, a mercenary. Originally from the National Guard, he traveled across the world, hopping around different mercenary squads, until one day he finally screwed up. He was caught in the explosion of a suicidal enemy. And when he woke up... He was in the body of a girl.

I was cursed to become a woman in place of the prince, and then he proposed to me!? My best friend from childhood, the high-spec Prince Vincent, and me, his follower Renoa. Though I've always been a loyal yes-man... Even if you're taking responsibility for me, I can't accept that proposal! The infatuating love story between a troublesome prince and his scapegoat attendant! (Source: Flex Comix, translated)

A couple's daily life adjustments to the boyfriend becoming a girl.

Assassins—they are humans that have exceptional skills which they use in killing people. The most dangerous among them is the Assassin of Crimson—the former leader of the Assassin guild Yuuyami, and the one who killed the country's leader, King Mars. Due to this, the country's princess has declared that whoever captures her will obtain fortune and become the princess' husband, essentially becoming the next king. Virgil is a guy who has red hair and looks like a girl. He is travelling with a performing troupe while searching for his twin brother Serge. His peculiar features seem to have matched the known characteristics of the Assassin of Crimson. The following events will lead him to discover the mystery behind the death of the king—and the identity of the Assassin of Crimson. (Source: MangaIchi Scanlation Division)

It's a different world where puberty is the result of a butterfly-like metamorphosis rather than simple growing up. Sometimes it goes wrong... (Source: MU)

Hikaru to Hikaru centers on Hikaru, the descendant of a long family line of ninjas. Though he has long trained in ninjutsu arts, he longs to master a technique that he has long had trouble with, the "Kunoichi no Jutsu," which allows a male ninja's body to transform into that of a female body. Without mastering this technique, Hikaru will never be acknowledged as a full-fledged ninja by his peers. In order to force him to get better, Hikaru's father orders him to enroll at a well-known all-girls school, and use what little skill he has in "Kunoichi no Jutsu" to hide his true gender and graduate from the school. (Source: ANN)

Chiaki is handsome, academically gifted, athletic, and born into a wealthy family with a beautiful sister. Despite his seemingly perfect life, he faces a persistent problem: he's never been lucky in love and struggles to capture the attention of girls. Determined to turn things around in high school, he wakes up one morning to a surprising transformation—he has turned into a girl! He is shocked to find out that he has lost the appearance he was so proud of, but when he looks in the mirror, he sees a very cute girl in the reflection. He immediately goes to show it off to his twin sister Kaede, who happens to be very popular with the girls, but there is also something very strange happening to her... (Source: Kadokawa, translated)

In order to save a young boy from certain death, a goddess decends and takes over his body in order to fight some aliens.

An anthology comic of Oniichan wa Oshimai! by various mangaka.

Two brothers, Noboru and Tohru grew away from the fact that their family could use the Water ki to keep demons away. However, in order to keep Tohru safe after a demon goes after his life, they will need to awake the fox deity Kuugen. (Source: Operation Boredom)

Akihiko Shimura, 20 years old, wakes up one morning as a blonde little girl. (Source: MU)

Mao lives with his three sisters in a village full of the presence of gods. On the day of the village festival in his first year of high school, he was given a divine destiny: to become a girl. While Mao is happy and accepting of his new womanhood, the other people in his life have more trouble coping. His aggressive twin sister Akoya (nicknamed Ako), who used to tease him for being a feminine crybaby, seems to blame herself for his transformation. Both Mao's twin sister and his closest male friend from school are going to have a hard time adjusting the way they think of this new female Mao! (Source: MangaHelpers)

Whoever looks upon their nightly figures will meet with certain death. Nephilim - a unique race that turns male by day and female by night. Labeled as "Gods of Death" it is said that whoever glances upon their bewitching night beauty will meet with certain death. Unfortunately for the playboy imperial soldier Gai, such an occurrence earns him a beautiful angel of death named Abel hellbent on taking his life. Then again, having a beautiful girl/boy obsessively chasing after him may not be so bad. Will Gai's expert playboy skills be able to conquer the beautiful Nephilim. Or will Abel succeed in killing the man who saw her true form? (Source: Amazon)

With looks to die for, Saika Kuozaki is the most powerful mage in existence and the only one who can thwart the annihilation factors that attempt to destroy the world once every three hundred hours. When Saika is mortally wounded, however, she bequeaths both her powers and body to the normal high school boy who happens to find her, Mushiki Kuga. Just because Mushiki inherits her abilities, though, doesn't mean he can control them. To stand a chance of saving the world, Mushiki will have to attend an academy for mages as Saika—while trying to keep his true identity under wraps! (Source: Yen Press)

Yazaki Yuuri, a transfer student, wants to be a popular high school kid. Also, despite how nerdy he knows it is, he's secretly working on writing a light novel. When strange things start happening around campus, an eccentric female student, Sakurabi Yukimi, explains to him that he has the power to unintentionally cause the creatures of his imagination to take physical form! Is it even possible for him to maintain his cool image while he's fighting the imaginary monsters from his formerly secret magic-girl light novel?

Fujinomiya Satoru is a pretty girl from Tokyo, transferring to a countryside middle school. There, she catches the attention of a boy named Okami Hayato who develops a crush on her. But little does Okami know that the real reason why Satoru transferred is because there is an old curse on her she's trying to break...?!

Tadashi Momose is the 13th resource for the antagonists, and his symbiosis is six thousand years in the making. Now known as "Momoe," he has been transformed by aliens and an unknown organization against his will. He merged with an alien life form having changing him into a hermaphrodite with both sexual organs. His semen is capable of infiltrating the human consciousness and turn them into worker bees that serve their master. If desired, a parasite can be sent into a host to recruit help, such as Midori and Yuki and even the class president. (Source: MU)

Shunichi Ikeya gets a confession from his childhood friend, Yuka Yashiro, and he comes out as gay. The outcome of that isn't what changes their lives together but rather, a change in sex is what turns their lives around... (Source: MU)

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. (Source: MU)