Manga series
ONIMAI: I'm Now Your Sister!
お兄ちゃんはおしまい！
Onii-chan wa Oshimai!
Mihari Oyama skipped grades and now studies at a university. Her latest test subject is her older brother Mahiro, a shut-in otaku who lives on video games. Thanks to a drug she made, he now has the body of a girl. Mihari keeps him under observation, and Mahiro has to get comfortable in a body he never asked for. Before long he is out of the house and transferring into a new school. His new classmates include the tomboyish Momiji and the hyper Asahi. The comedy comes from an adult recluse relearning everyday life from scratch. Under the gags is a gentle story about a shut-in slowly rejoining the world. Readers who like cute slice of life with a gender swap premise will feel at home.
Japanese volumes
11
Out in English
10
Next in English
Not announced
- Author
- Nekotofu
- Status
- Releasing in Japan
- Started
- 2017
- Updated
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Comedy · Slice of Life
ONIMAI: I'm Now Your Sister! in short
How many volumes of ONIMAI: I'm Now Your Sister! are out in English?
English is at volume 10, Japan at 11. Volume 10 came out on 27 January 2026 as an ebook. Kodansha publishes it in English.
How many volumes does ONIMAI: I'm Now Your Sister! have?
ONIMAI: I'm Now Your Sister! has 11 volumes in Japan so far. The series is still running.
Is ONIMAI: I'm Now Your Sister! finished?
No. ONIMAI: I'm Now Your Sister! is still running in Japan.
When is the next English volume of ONIMAI: I'm Now Your Sister!?
No date is announced yet. Mangainfo checks its sources for new dates every morning.
English editions
Japanese volumes
Each volume page shows its English edition with date, ISBN and where to buy.
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Sources
This page draws on AniList, NDL, openBD, ISBNdb. Each value shows only when a source states it. About the sources