Top 6 Manga Like Onimai: I'm Now Your Sister! (Onii-chan wa Oshimai) [2024 List]

Onii-chan wa Oshimai

Mahiro Oyama was just a normal erotic-game loving dude...until he woke up one morning as a woman! Turns out his mad-scientist little sister, Mihari, tried out one of her new experiments on him...with a disastrous outcome, as far as Mahiro's concerned! But Mihari is as determined to study him as he is determined to go back to his shut-in, game-playing life, and one thing's for sure...life is going to get a whole lot weirder from here on out!

Onimai: I'm Now Your Sister! It is also Known as: お兄ちゃんはおしまい, Onii-chan is Done For

Genres: Comedy , Science Fiction , Slice of Life , Gender Bender , Cross Dressing

Try our anime quiz: Anime Characters Guessing Quiz/Game

6. Kashimashi: Girl Meets Girl

Kashimashi: Girl Meets Girl

Being a girl is harder than it looks...
For Hazumu, this couldn't be truer, because just the other day, she...was a he.
Shunned by the girl of his dreams, Hazumu loses himself in the mountains and is promptly squashed by an oncoming space ship. The alien inside, feeling guilty, rebuilds Hazumu's body...but as the wrong gender!
Now Hazumu must learn how to be the girl his parents always wanted while dealing with the trials and tribulations of being caught in a love triangle between two girls--his childhood friend, Tomari, and Yasuna, the girl who rejected him but is now strangely attracted to him/her!
.

Kashimashi ~Girl Meets Girl~ has finished publishing and it has 35 Chapters. It is also Known as: かしまし ~ガール・ミーツ・ガール~, Kashimashi, Kasimasi

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5. Joshi Shougakusei Hajimemashita P!

Joshi Shougakusei Hajimemashita P!

A 30-year-old business man makes a wish to be a girl. A chanting object runs toward him, and the next thing he knows he has became a loli elementary school girl.

Joshi Shougakusei Hajimemashita P! has finished publishing and it has 76 Chapters. It is also Known as: 女子小学生はじめましたP!, Joshi Shougakusei Hajimemashita P!

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4. Osananajimi wa Onnanoko ni Naare

Osananajimi wa Onnanoko ni Naare

On one particular day, a high school student, Shuichi, saves a magical fairy Sylphy from drowning in a pond. When Sylphy offers to grant one wish out of gratitude, Shuichi immediately asks for a "cute childhood girlfriend." Sylphy then turns Shuichi’s childhood male friend, Iori, into a girl...! The newly female Iori is surprisingly cute...!

Osananajimi wa Onnanoko ni Naare has finished publishing and it has 41 Chapters. It is also Known as: 幼なじみは女の子になぁれ, Osananajimi wa Onnanoko ni Naare

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3. Ore ga Watashi ni Naru made

Ore ga Watashi ni Naru made

A boy who used to be abusive to girls wakes up one day as one. "I'll go back being a boy soon," he thought, however that was not the case. Follow Akira as he grows and learns little by little to accept the puzzling changings in her surroundings and her heart.

Until I Become Me is currently publishing and has Chapters. It is also Known as: オレが私になるまで, Orewata

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2. Danshi Kokosei Dakedo Gal ni TS Shimashita

Danshi Kokosei Dakedo Gal ni TS Shimashita

Shunpei, a loner high schooler, became a gyaru after saving the god of gyaru from drowning. Through his mother's connections, he was able to transfer to an all-girls school, but it was stuffed to the brim with gyarus!
Every day is a sensory overload for Shunpei, who's never even talked to a girl, let alone a gyaru.

It's the beginning of an introverted high school guy => gender-swapped gyaru comedy!

I’m a High School Boy, but I Got Gender-Swapped Into a Gyaru is currently publishing and has Chapters. It is also Known as: 男子高校生だけどギャルにTSしました, Danshi Kokosei Dakedo Gyaru ni TS Shimashita

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1. Boku Girl

Boku Girl

Suzushiro Mizuki is a 1st year high school student who has the difficulty of constantly being mistaken for a girl. It's so bad that he's endlessly rebuffing the confessions of many men. Even the girl he has a crush on seems to think of him more as one of the girls rather than as a potential love interest.

Meanwhile, the trickster god Loki has grown bored with playing her tricks on her fellow gods. Turning her attention to the mortal world, she targets Mizuki for her next round of fun. The result: Mizuki wakes up with budding breasts and a missing part of his anatomy.

What else is in store for Mizuki and how will he deal with it?

has finished publishing and it has 107 Chapters. It is also Known as: ボクガール, Boku Girl

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