A TS comedy manga series about a boy transformed into a girl by his little sister's strange drugs. Written and illustrated by [[Nekotoufu]].

Initially serialized online and in doujinshi in 2017 (pool #12768), Ichijinsha began publishing the work in print in 2018, and in 2019 it began serialization in the Monthly Comic Rex magazine. Kodansha USA has licensed the English version and is publishing it under the title "ONIMAI: I'm Now Your Sister!". An anime TV series adaptation premiered in January 2023. 

In the official media, almost all characters have [[tareme]] by default. In the anime, all characters have [[bright pupils]] and many have [[streaked hair]] and [[colored inner hair]].

h4. Characters

* [[Oyama Mahiro]]
* [[Oyama Mihari]]
* [[Hozuki Kaede]]
* [[Hozuki Momiji]]
* [[Oka Asahi]]
* [[Murosaki Miyo]]
* [[Tenkawa Nayuta]]

h4. External links

* "Special page on the author's website":[http://grin.oops.jp/onimai]
* "English book page on Kodansha USA":[https://kodansha.us/series/onimai-im-now-your-sister/]
お兄ちゃんはおしまい! お兄ちゃんはおしまい おにまい おにまいお絵描き