Chichi no Jikan follows Shinogi Kyuuichi, a male biology student who lives in an apartment near a helpful female neighbor/friend, Takarai Ayaka. One day, he is visited by aliens, who demand that he raise their baby for a year... or else the world is history. The baby is apparently human, and is raised the way humans are: through breast-feeding. Kyuuichi's sex is not a problem for the aliens: they give him a simple device that switches his body to a woman's with the mere touch of a button. Conveniently, Kyuuichi's female form is very well-endowed.
Although she's understandably confused and uncomfortable by the whole situation, Ayaka helps Kyuuichi out as he navigates the unfamiliar experience of raising a child, and breast-feeding it in particular. That means going to a store to buy a breast pump, visiting a maternity hospital to get a massage to release Kyuuichi's stored-up milk, and giving the baby a bath together. Kyuuichi, as a biology student, is fascinated by the whole thing from an academic perspective.

The story of a boy who wants to have sex with his best friend and the best friend who doesn't want to have sex with him.

This is surely a story you've never thought of! The cartoon’s main character is called Yuan Xin. She’s an otaku who likes to immerse herself in a fantasy world. She, who likes to look at hot guys--after embarrassing herself in front of them in the school yard, decides to retaliate. Unexpectedly, during the crucial moment, an accident happened, and she crossed over to the game world!

What are the challenges of visiting a boy who became a girl to get along with his senior?
It is a work drawn with favourite attributes such as TS, Yuri and Blonde Twintail

From Yen Press:

When sweet and docile Hikaru swaps bodies with her beloved twin brother, Youta, her personality does a complete one-eighty--and she starts taking brotherly affection to a whole new level! Will Youta ever get his body back in this cracking forbidden love comedy?!

A girl confesses her love to her senpai… who turns out to be a crossdresser. The kouhai is okay with it, and hijinks ensue.

Due to love at first sight, an outstandingly beautiful female dancer became a young master’s page boy and sets forth to protect the young master's chastity! (Moon Bunny Cafe)

This volume spinoff offers a new ending to the original series. Will Akira and Momoi switch back into each others bodies? Also included are a few one-shot stories.

To drown men into dazzling pleasure and show them their loved ones in their dreams, that is a succubus. Due to an accident, a young 17 years old boy named Riichi Hourai is reincarnated into a succubus due to a misunderstanding by the Reincarnation Support Department. For a succubus to live, she squeezes out man’s life essence and must consume it but Riichi as a former man firmly refuses it and would rather die than do such behavior. Does a substitute for a life essence kind of food exist? There is! And surprisingly it’s milk!! However, There’s no race called a cow in another world let alone drink milk from other races. Although the Rehabilitation Support Department gave him a dairy cow under special circumstances, he risks his own life raising the cattle who will become his life line in a parallel world and survive there while resisting his succubus nature. Moreover, It seems the cow wasn’t just any ordinary creature… Contrary to his desire for a peaceful life, Riichi was dragged into conflicts that influenced the fate of the world without him noticing it. Though him and his best friend have both died in an accident and his best friend reincarnated a bit late, both of them haven’t noticed the existence of one another. Can Riichi meet his best friend ever again?! Will their friendship be the same like their past life?! A romantic comedy with their new cheat forms start here.

Huang Zixia is an investigative prodigy who proved herself by helping her father solve confounding crimes. After being accused of murdering her whole family due to an arranged marriage, the heroine is on the run. When she meets a prince, they work together to investigate the truth of the murder.

One day in the gardens, Karin and her crush, Aki, meet to celebrate Aki entering senior high...

A normal, honest sophomore guy, whose life was changed when he became a super beautiful girl. Who was the one that caused it? Are there any more misfortunes lying in wait for him/her? What kind of charming experiences will he have...?

A guy finds himself transported into the world of a classic horror movie. And what's more, as the 'slutty character' who dies first!?

During the Japanese Asset Price Bubble, everyone, men or women, young or old, lived in a world that was filled with frenzy. In the air where strength overruns weakness, there is a “woman” who tries to avenge her past. But, there's a twist with this “woman”. One is that she was a cold killer. Second is that this “woman” is actually a man.

Chihaya is a boy that is looked down because he looks like a girl. Due to that reasons, he isolates himself at home. His mom suggests that he should go to Seiou Academy which is an all girls school. Thus, the story started...

When we woke up, we changed genders.

In order to be bought by a rich family, Narumi Inoue, hiding the truth that he is a man, goes to a girls' school. As a trainee, Narumi was sent to serve a girl from a rich family who hates maids (only weekends). Keeping the 'heart of treating/serving people,' Japanese maid, Maid in Japan, Narumi's battle will start? If it is found out that Narumi is a man, he will be castrated.

When the boy's soul enters the body of a girl, but what about he's able to destroy the demons in order to protect the world? A work of Jiu Ye has officially launched.

My best friend became a guy?! A story about a girl and how her class adjust to their classmate’s changed gender.

Due to his sister's refusal to come home to work in the family inn, a boy is forced to cross dress by his mother. As time goes by, he comes to rather enjoy it.