Onimai: I’m Now Your Sister! (manga)

Onimai: I’m Now Your Sister! (Japaneseお兄ちゃんはおしまい!HepburnOnii-chan wa Oshimai!lit. “Big Brother is Done For!”) is a Japanese manga series written and illustrated by Nekotofu. The series has been serialized online since 2017; it is also currently serialized in Ichijinsha‘s Monthly Comic Rex magazine since April 2019. It is licensed in English by Kodansha USA. An anime television series adaptation by Studio Bind is set to premiere in January 2023.

Plot

The series follows Mahiro Oyama, an otaku living with his scientist younger sister Mihari. One day he wakes up as young girl, a result of one of Mihari’s experiments. Mahiro must now learn to live as a middle school girl, all while making friends in his new school.

Media

Manga

Written and illustrated by Nekotofu, Onimai: I’m Now Your Sister! began serialization online via Pixiv and other platforms in 2017. It also started in Ichijinsha‘s Monthly Comic Rex magazine on April 27, 2019. As of April 2022, six tankōbon volumes have been released by Ichijinsha. In North America, Kodansha USA is publishing the series in English.

Anime

An anime television series adaptation was announced on April 22, 2022. It is produced by Studio Bind and directed by Shingo Fujii, with scripts written by Michiko Yokote, character designs handled by Ryo Imamura, and music composed by Daisuke Achiba and Alisa Okehazama. The series is set to premiere in January 2023. The opening theme song is “Identeitei Meltdown” (アイデン貞貞メルトダウン) by P Maru-sama and Enako, while the ending theme song is “Himegoto * Cry Sisters” (ひめごと*クライシスターズ) by Marika KōnoKaori IshiharaHisako Kanemoto, and Minami Tsuda.

Reception

Onimai: I’m Now Your Sister! ranked fifth in Da Vinci’s Next Manga Award 2018 in the web manga category in August 2018, and ranked ninth in Web Manga Overall Election 2019 in October 2019. The manga also ranked third in AnimeJapan‘s Manga We Want to See Animated Ranking in 2020, and ranked seventh in 2021.

 

Onimai: I’m Now Your Sister!
Onimai, I'm Now Your Sister! volume 1 cover.jpg

Cover of Onimai: I’m Now Your Sister! volume 1 by Ichijinsha
お兄ちゃんはおしまい!
(Onii-chan wa Oshimai!)
Genre Comedy, slice of life
Manga
Written by Nekotofu
Published by Ichijinsha
English publisher
Magazine Monthly Comic Rex (April 27, 2019–present)
Demographic Shōnen
Original run 2017 – present
Volumes (List of volumes)
Anime television series
Directed by Shingo Fujii
Written by Michiko Yokote
Music by
  • Daisuke Achiba
  • Alisa Okehazama
Studio Studio Bind
Original run January 2023 – scheduled

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