# Onimai

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***Onimai: I'm Now Your Sister!*** (お兄ちゃんはおしまい!, *Onii-chan wa Oshimai!*, lit. 'Older Brother Is Done For!')[a] is a Japanese [manga](/source/Manga) series written and illustrated by Nekotofu. The series has been serialized online since 2017; it is also currently serialized in [Ichijinsha](/source/Ichijinsha)'s *[Monthly Comic Rex](/source/Monthly_Comic_Rex)* magazine since April 2019. It is licensed in English by [Kodansha USA](/source/Kodansha_USA). An [anime](/source/Anime) television series adaptation by [Studio Bind](/source/Studio_Bind) aired from January to March 2023; it gained high ratings, although it received a mixed reception from foreign critics.

## Plot

The series follows Mahiro Oyama, an *[otaku](/source/Otaku)* and [NEET](/source/NEET) who lives alone with his scientist younger sister Mihari. One day he wakes up to find himself transformed into a young girl, a result of one of Mihari's experiments. Mahiro must now learn to become comfortable in his new body whilst living life as a middle school girl.

## Characters

**Mahiro Oyama (緒山 真尋, *Oyama Mahiro*)[b]**- [2]
- The protagonist of the series, Mahiro was previously an *[otaku](/source/Otaku)* man living with his younger sister Mihari until he was turned into a girl as a result of one of her experiments. Mahiro ends up transferring to a [middle school](/source/Middle_school). Mahiro is fond of playing video games and mainly stayed at home before being turned into a girl.
**Mihari Oyama (緒山 みはり, *Oyama Mihari*)**- [2]
- Mahiro's younger sister and a scientist. She turned Mahiro into a girl as a result of one of her experiments. Due to her high intelligence, she skipped several grades and is now a university student.
**Kaede Hozuki (穂月 かえで, *Hozuki Kaede*)**- [3]
- Mihari's classmate during middle school and a *[gyaru](/source/Gyaru)*. She is Momiji's older sister. She is good at cooking and using cosmetics. She also works part-time at a fast food restaurant.
**Momiji Hozuki (穂月 もみじ, *Hozuki Momiji*)**- [3]
- Kaede's younger sister and Mahiro's classmate. She has a tomboyish personality and greatly admires Mahiro. She has been friends with Asahi for several years.
**Asahi Ōka (桜花 朝日, *Ōka Asahi*)[c]**- [4]
- Mahiro's classmate. She has an energetic personality but tends to not perform well in tests. She also calls Mahiro by many nicknames.
**Miyo Murosaki (室崎 美夜, *Murosaki Miyo*)[d]**- [4]
- Mahiro's classmate. She is interested in *[yuri](/source/Yuri_(genre))* and tries to hide it poorly. She enjoys imagining her friends in romantic situations. Miyo is notably bustier than her classmates and embarrassed about it.
**Nayuta Tenkawa (天川 那由多, *Tenkawa Nayuta*)[e]**- Mahiro's classmate who joins during their second year of middle school. She is a bright, yet shy girl who is the ward of Mihari's faculty advisor Chitose Azuma, who is having her monitor Mahiro without Mihari's knowledge. After revealing to Mahiro that she knows the truth about her, she is quickly accepted into Mahiro's group of friends. She is very knowledgeable due to the many hours she spent in the university library, and speaks in a very polite tone with everyone she encounters.
**Chitose Azuma (吾妻 ちとせ, *Azuma Chitose*)**- Mihari's faculty advisor and senpai at the university Mihari attends, as well as Nayuta's guardian. She made key contributions that allowed for the creation of the drug that turned Mahiro into a girl. Although Mihari believes that she did this out of the goodness of her heart, she is actually using Mihari to fulfill an unknown agenda and enrolled Nayuta into the same class as Mahiro to spy on her without Mihari's knowledge.

## Production

Prior to creating the series, *Onimai'*s author, Nekotofu, was a fan of the "gender bender" genre of anime and manga that included such works as *[Ranma ½](/source/Ranma_%C2%BD)*, *[Kashimashi: Girl Meets Girl](/source/Kashimashi:_Girl_Meets_Girl)*, and *[Idol Pretender](/source/Idol_Pretender)*.[5] As such, Nekotofu had harbored a longtime interest in creating his own such series, and was inspired to do so after seeing *[Your Name](/source/Your_Name)*.[6][7] He was also motivated by the positive response to a *[doujinshi](/source/Doujinshi)* he had created which also featured similar gender-bending elements. Nekotofu began self-publishing *Onimai* on [Pixiv](/source/Pixiv) in January 2017, and later on [Niconico Seiga](/source/Niconico_Seiga), where it became significantly more popular.[5] In April 2019, the manga began serialization in [Ichijinsha](/source/Ichijinsha)'s *[Monthly Comic Rex](/source/Monthly_Comic_Rex)* magazine.[1][8] Nekotofu continues to self-publish the series online and produce *doujinshi* with permission from Ichijinsha.[5]

## Media

### Manga

Written and illustrated by Nekotofu, *Onimai: I'm Now Your Sister!* began serialization online via [Pixiv](/source/Pixiv) and other platforms in 2017.[1] It also started in [Ichijinsha](/source/Ichijinsha)'s *[Monthly Comic Rex](/source/Monthly_Comic_Rex)* magazine on April 27, 2019.[8] As of May 2026, eleven *[tankōbon](/source/Tank%C5%8Dbon)* volumes have been released by Ichijinsha.[9] In North America, [Kodansha USA](/source/Kodansha_USA) is publishing the series digitally in English.[10]

### Anime

An [anime](/source/Anime) television series adaptation was announced on April 22, 2022. It is produced by [Studio Bind](/source/Studio_Bind) and chief directed by Shingo Fujii, with [Michiko Yokote](/source/Michiko_Yokote) as head writer, character designs handled by Ryo Imamura, and music composed by Daisuke Achiba and Alisa Okehazama.[1][11] The series aired from January 5 to March 23, 2023, on [AT-X](/source/AT-X_(TV_network)) and other networks.[3][12] The opening theme song is "Identeitei Meltdown" (アイデン貞貞メルトダウン) by [Enako](/source/Enako) feat. P Maru-sama, while the ending theme song is "Himegoto*Crisisters" (ひめごと＊クライシスターズ) by [Marika Kōno](/source/Marika_K%C5%8Dno), [Kaori Ishihara](/source/Kaori_Ishihara), [Hisako Kanemoto](/source/Hisako_Kanemoto), and [Minami Tsuda](/source/Minami_Tsuda).[13] [Crunchyroll](/source/Crunchyroll) streamed the series.[14] [Medialink](/source/Medialink) has licensed the series in Asia-Pacific.[15]

## Reception

### Accolades

*Onimai: I'm Now Your Sister!* ranked fifth in Da Vinci's *[Next Manga Award](/source/Next_Manga_Award) 2018* in the [web manga](/source/Web_manga) category in August 2018,[16] and ranked ninth in *Web Manga Overall Election 2019* in October 2019.[17] The manga also ranked third in [AnimeJapan](/source/AnimeJapan)'s *Manga We Want to See Animated Ranking* in 2020,[18] and ranked seventh in 2021.[19]

### Critical reception

The series received positive reviews and was ranked by viewers in Japan as the top-rated TV anime of the Winter 2023 season on both [Niconico](/source/Niconico) and anime ranking website Anikore.jp.[20][21] One Japanese-language reviewer, writing for [4Gamer.net](/source/4Gamer.net), echoed positive sentiments regarding its music and art style.[22] Shoki Ota, writing for *[KAI-YOU](/source/KAI-YOU)*, said the series was remarkable for its meticulous depiction of everyday life, and said, "While it might not be for everyone due to its gender swap themes, it feels like a condensed work amid the recent 'anime festival', making it a must-see this season".[23]

In early English-language coverage of the series, the critical response to *Onimai's* first few episodes were mixed[24][25][26] despite the high user ratings.[27] Some reviewers criticized the first episode's premise and *[lolicon](/source/Lolicon)* themes, and perceived incestuous overtones, while praising the animation and music, which was near-universally deemed to be of exceptional quality.[24][28][26] Rebecca Silverman was softer in her criticisms, describing the [fan service](/source/Fan_service) as "relatively toned down" but stated that the narrative premise was too "mean" for her to enjoy and squandering its potential.[24]

Kim Morrissy, reviewing the anime for Anime News Network, was more positive, saying "*Onimai* is the best anime of the season."[26] Morrissy strongly praised the narrative, humor, art, and animation production, particularly the work of series director [Shingo Fujii](/source/Shingo_Fujii), who previously worked on *[Precure](/source/Precure)*.[26][29][30] Sakugablog also mentioned Onimai multiple times in their Sakugabooru Animation Awards 2023 for Best Show, Best Animation Design, and other categories but did not give it any awards.[31]

### Popularity

In February 2023, fans of *Onimai* sent numerous gifts to the staff of [Studio Bind](/source/Studio_Bind), the production studio of the anime, which series director Shingo Fujii posted photos of in a tweet voicing thanks for the support.[32][33]

## Notes

1. "Oshimai" written phonetically to have a double meaning of お終い "done for" and お姉妹 "sister"

1. As a girl, Mahiro's name is written as , spelled phonetically in [hiragana](/source/Hiragana).

1. Her given name is usually written in hiragana (あさひ) in the series.

1. Her given name is usually written in hiragana (みよ) in the series.

1. Her given name is usually written in hiragana (なゆた) in the series.

## References

1. Pineda, Rafael Antonio (April 22, 2022). ["ONIMAI: I'm Now Your Sister! Gender-Bending Comedy Manga Gets TV Anime"](https://www.animenewsnetwork.com/news/2022-04-21/onimai-im-now-your-sister-gender-bending-comedy-manga-gets-tv-anime/.184875). *[Anime News Network](/source/Anime_News_Network)*. [Archived](https://web.archive.org/web/20221007043801/https://www.animenewsnetwork.com/news/2022-04-21/onimai-im-now-your-sister-gender-bending-comedy-manga-gets-tv-anime/.184875) October 7, 2022 at the Wayback Machine. Retrieved April 22, 2022.

1. Dempsey, Liam (April 22, 2022). ["ONIMAI: I'm Now Your Sister! Slice of Life Manga Gets TV Anime Adaptation"](https://www.crunchyroll.com/anime-news/2022/04/21-1/onimai-im-now-your-sister-slice-of-life-manga-gets-tv-anime-adaptation). *[Crunchyroll](/source/Crunchyroll)*. [Archived](https://web.archive.org/web/20220928221235/https://www.crunchyroll.com/anime-news/2022/04/21-1/onimai-im-now-your-sister-slice-of-life-manga-gets-tv-anime-adaptation) September 28, 2022 at the Wayback Machine. Retrieved April 22, 2022.

1. Pineda, Rafael Antonio (August 11, 2022). ["ONIMAI: I'm Now Your Sister! Anime's Video Reveals More Cast, January 2023 Premiere"](https://www.animenewsnetwork.com/news/2022-08-11/onimai-im-now-your-sister-anime-video-reveals-more-cast-january-2023-premiere/.188583). *[Anime News Network](/source/Anime_News_Network)*. [Archived](https://web.archive.org/web/20220812014744/https://www.animenewsnetwork.com/news/2022-08-11/onimai-im-now-your-sister-anime-video-reveals-more-cast-january-2023-premiere/.188583) August 12, 2022 at the Wayback Machine. Retrieved August 12, 2022.

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1. ["On'ea | Terebi Anime "Onii-chan wa Oshimai!" Kōshiki Saito"](https://onimai.jp/onair/) [On Air | TV Anime "ONIMAI: I'm Now Your Sister!" Official Website] (in Japanese). *onimai.jp*. [Archived](https://web.archive.org/web/20230104133115/https://onimai.jp/onair/) January 4, 2023 at the Wayback Machine. Retrieved January 6, 2023.

1. Cayanan, Joanna (September 25, 2022). ["ONIMAI: I'm Now Your Sister! Anime Reveals Theme Song Artists"](https://www.animenewsnetwork.com/news/2022-09-25/onimai-im-now-your-sister-anime-reveals-theme-song-artists/.190172). *[Anime News Network](/source/Anime_News_Network)*. [Archived](https://web.archive.org/web/20220925133542/https://www.animenewsnetwork.com/news/2022-09-25/onimai-im-now-your-sister-anime-reveals-theme-song-artists/.190172) September 25, 2022 at the Wayback Machine. Retrieved September 25, 2022.

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1. ["👩🏻《ONIMAI: I'm Now Your Sister!》 is arriving on Ani-One Asia ULTRA!"](https://www.youtube.com/post/UgkxJTWPUxSCeRTyVgAW8Jg9x2dw2so0WFvF). *[YouTube](/source/YouTube)*. December 20, 2022. [Archived](https://web.archive.org/web/20221221081603/https://www.youtube.com/post/UgkxJTWPUxSCeRTyVgAW8Jg9x2dw2so0WFvF) December 21, 2022 at the Wayback Machine. Retrieved December 21, 2022.

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1. ["Anime worth checking out in Winter 2023"](https://www.kgun9.com/entertainment/anime-worth-checking-out-in-winter-2023). *KGUN 9 Tucson News*. January 12, 2023. [Archived](https://web.archive.org/web/20230123101432/https://www.kgun9.com/entertainment/anime-worth-checking-out-in-winter-2023) January 23, 2023 at the Wayback Machine. Retrieved January 23, 2023.

1. Morrissy, Kim (January 20, 2023). ["ONIMAI: I'm Now Your Sister! ‒ SERIES PREMIERE"](https://www.animenewsnetwork.com/review/onimai-im-now-your-sister/episodes-1-3/.193988). *Anime News Network*. [Archived](https://web.archive.org/web/20230121000407/https://www.animenewsnetwork.com/review/onimai-im-now-your-sister/episodes-1-3/.193988) January 21, 2023 at the Wayback Machine. Retrieved January 21, 2023.

1. Knight, Thomas (March 23, 2023). ["Onimai: I'm Now Your Sister! – Series Review Best of Winter 2023"](https://www.nookgaming.com/onimai-im-now-your-sister-series-review-best-of-winter-2023/). *NookGaming*. Retrieved 3 January 2024.

1. Catwell, Cy (January 6, 2023). ["ONIMAI: I'm Now Your Sister! – Episode 1"](https://www.animefeminist.com/onimai-im-now-your-sister-episode-1/). *Anime Feminist*. [Archived](https://web.archive.org/web/20230120100433/https://www.animefeminist.com/onimai-im-now-your-sister-episode-1/) January 20, 2023 at the Wayback Machine. Retrieved January 20, 2023.

1. Morrissy, Kim (January 27, 2023). ["ONIMAI: I'm Now Your Sister! ‒ Episode 4"](https://www.animenewsnetwork.com/review/onimai-im-now-your-sister/episode-4/.194222). *Anime News Network*. [Archived](https://web.archive.org/web/20230128000528/https://www.animenewsnetwork.com/review/onimai-im-now-your-sister/episode-4/.194222) January 28, 2023 at the Wayback Machine. Retrieved January 28, 2023.

1. Morrissy, Kim. ["ONIMAI: I'm Now Your Sister! Episode 12"](https://www.animenewsnetwork.com/review/onimai-im-now-your-sister/episode-12/.196317). *Anime News Network*. Retrieved 4 January 2024.

1. ["Sakugabooru Animation Awards 2023"](https://blog.sakugabooru.com/2024/01/03/sakugabooru-animation-awards-2023/). *SakugaBlog*. January 3, 2024. Retrieved 4 January 2024.

1. McDonald, Sean (February 18, 2023). ["Anime Fans Support Ecchi Anime Onimai by Sending the Production Crew Food"](https://www.cbr.com/fans-support-ecchi-anime-onimai-with-food/). *CBR*. [Archived](https://web.archive.org/web/20230219000228/https://www.cbr.com/fans-support-ecchi-anime-onimai-with-food/) February 19, 2023 at the Wayback Machine. Retrieved February 19, 2023.

1. Lee, Choo Sum (2024-06-09). ["ONIMAI: I'm Now Your Sister! Production Team Receives Tons of Gifts from Fans"](https://www.animenewsnetwork.com/interest/2023-02-08/onimai-im-now-your-sister-production-team-receives-tons-of-gifts-from-fans/.194636). *Anime News Network*. Retrieved 2024-06-09.

## External links

- [Series homepage on Kodansha Comics](https://kodansha.us/series/onimai-im-now-your-sister/)
- [Official anime website](https://onimai.jp/) (in Japanese)

---
Adapted from the Wikipedia article [Onimai](https://en.wikipedia.org/wiki/Onimai) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Onimai?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.